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[Thinkers](https://miscsubjects.com/a/oip-thinkers) › **Jerome Saltzer and Michael Schroeder — The Protection of Information in Computer Systems**\n>\n> **Shelf:** Thinkers · **Traversal:** self-explaining · hierarchical · voxel-ready\n> **Machine root:** [OIP tree](https://miscsubjects.com/api/dispatch?map=1&format=markdown) · [Registry](https://miscsubjects.com/api/dispatch?registry=1)","status":"active","vx_hash":"630f1f90e8f4d824ccabfd76c450569b10fc8623fd0f3c9cf907b3afaca48fee","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"5ea31e6a80f8077c2aff05d8526d73ab870e86789c084e490afaf3946cc396f2","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"0e8fb016dfdec16b70abac0b51c3bbbf9792b24e08552cf496cb44679592ab35","detail":{"divided_from":"body","block":2,"kind":"quote"},"prev":"genesis","hash":"5ea31e6a80f8077c2aff05d8526d73ab870e86789c084e490afaf3946cc396f2"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d2"},{"id":"d3","kind":"h","type":null,"order":3,"text":"# Jerome Saltzer and Michael Schroeder — The Protection of 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thinker-saltzer-schroeder","status":"active","vx_hash":"e7717583e5bda3a54ec8b05bf12092c9884e133a77144a783902f909a617c205","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"6bbc9d78a1d7e48f303360bde8fc113056034e8ff7f23f55d48afb97b299039f","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"386e9bc6b16250eafdb4f99d5516e374a1b4e617eb10efc26fad4551a75ecfb1","detail":{"divided_from":"body","block":4,"kind":"h"},"prev":"genesis","hash":"6bbc9d78a1d7e48f303360bde8fc113056034e8ff7f23f55d48afb97b299039f"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d4"},{"id":"d5","kind":"p","type":null,"order":5,"text":"**What this page is:** A summary of the eight security design principles defined by Saltzer and Schroeder in their 1974 paper.\n**What it explains:** How to design a computer system so that it protects information by default, and why eight specific principles make the difference between a secure system and an insecure one.\n**Why read it:** To understand the rules that every secure system follows, and to see how a single paper written in 1974 still defines security architecture today.","status":"active","vx_hash":"457e32e08fa375732605b4197f409bc388c9e553a03a84be2d5bb5b2722b1312","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"0d0642490a6624acbe63ca12d362c84eacc712b8606eae2df08982edd92b52ef","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"f780e54a5f15bc4845658b10634790f99c69535b194d8b25c509b6ca0eeb70c9","detail":{"divided_from":"body","block":5,"kind":"p"},"prev":"genesis","hash":"0d0642490a6624acbe63ca12d362c84eacc712b8606eae2df08982edd92b52ef"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d5"},{"id":"d6","kind":"h","type":null,"order":6,"text":"### What Saltzer and Schroeder Is","status":"active","vx_hash":"cf66c28ebda9d0ca6a668c5eccd610b81f03e361af0c05c397a7ae297ef63cde","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"3f8aaea820832d0ff7317a242d5f8725ac65b44783adfe0e84e07523a4f84a73","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"59b61b4e0455044e82e5b0535d095310e56a591b83dddafc9df21b137ee731bc","detail":{"divided_from":"body","block":6,"kind":"h"},"prev":"genesis","hash":"3f8aaea820832d0ff7317a242d5f8725ac65b44783adfe0e84e07523a4f84a73"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d6"},{"id":"d7","kind":"p","type":null,"order":7,"text":"Jerome Saltzer (born 1939) is a computer scientist at MIT. Michael Schroeder is a computer scientist at Xerox PARC and later at DEC Systems Research Center. In 1974 they published \"The Protection of Information in Computer Systems\" in the *Proceedings of the IEEE*. This paper is the most cited publication in the field of computer security. It lists eight design principles for building systems that protect information from unauthorized access.","status":"active","vx_hash":"6c2083b83fdf248249d457682868b8f494943c4f3e4418fdaba7955e70c50eb7","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"b4567f8fcf4cd3552879c0fb272a5d73d753fe2c299b404cf40f907716294308","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"98f65024cd24d3ef3413ba87cd01e7fb8c4155f3cca849d8105664033f980f14","detail":{"divided_from":"body","block":7,"kind":"p"},"prev":"genesis","hash":"b4567f8fcf4cd3552879c0fb272a5d73d753fe2c299b404cf40f907716294308"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d7"},{"id":"d8","kind":"h","type":null,"order":8,"text":"### Why It Matters","status":"active","vx_hash":"a4f8b04fa64011f1b2b0e6a7f7ebf1497243778061cd088cb46cfce04ac8e511","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"fa878041c9fb4ed281f75bfbee973bb77206d0cbd04e856a9566861328dc6cfb","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"a4819b750e1f362046048e66a2633f32de13b891cbecc89e4945f5a4a78ff266","detail":{"divided_from":"body","block":8,"kind":"h"},"prev":"genesis","hash":"fa878041c9fb4ed281f75bfbee973bb77206d0cbd04e856a9566861328dc6cfb"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d8"},{"id":"d9","kind":"p","type":null,"order":9,"text":"Every security breach that makes the news happens because one or more of these eight principles was violated. When a system defaults to allowing access, that is a violation of fail-safe defaults. When a system checks permission once and never again, that is a violation of complete mediation. When a system's security depends on keeping its source code secret, that is a violation of open design. Saltzer and Schroeder did not invent these principles out of nothing — they extracted them from studying which systems failed and which systems survived. Their paper is a checklist. Violate it at your own risk.","status":"active","vx_hash":"cd45b22d9749011eb353675f92c35e4c7ec2b24aeacb177cff67c71d256f7105","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"d35e3f139328a27032e57d34f105c2fcb966b88c203cac1f50ab5ad288c2c118","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"bdf8b3370e3151af951ed3b7952cec81c373fb726299ac382ebc7e82a2264bf1","detail":{"divided_from":"body","block":9,"kind":"p"},"prev":"genesis","hash":"d35e3f139328a27032e57d34f105c2fcb966b88c203cac1f50ab5ad288c2c118"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d9"},{"id":"d10","kind":"h","type":null,"order":10,"text":"### The Key Idea","status":"active","vx_hash":"193389ce6a1257b5e0c088f82d801e28fab79abc90a2d10f4ba87bc388013acd","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"4552d911b0a167b8da3794952e8126c6f7298ebe85b26fa883d19fab8a28463a","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"441af1806499f3c61d7189137057d9d38e063ccdca01d669193809ee90c0ef2d","detail":{"divided_from":"body","block":10,"kind":"h"},"prev":"genesis","hash":"4552d911b0a167b8da3794952e8126c6f7298ebe85b26fa883d19fab8a28463a"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d10"},{"id":"d11","kind":"p","type":null,"order":11,"text":"Security is not a feature you add to a system after you build it. Security is a property of how the system is designed. Saltzer and Schroeder distilled this into eight principles:","status":"active","vx_hash":"6b06879adddaa90e412935e06be2d40fadba1b17e9fb7efb843bdc6bd9f14ebc","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"e876a877d8cfe0167b3bf212485a4e030775b793c56415013d386eface9d3b10","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"4d4915741d595234e513b329e692389764ec8511d2f1e352edef117deccbd8db","detail":{"divided_from":"body","block":11,"kind":"p"},"prev":"genesis","hash":"e876a877d8cfe0167b3bf212485a4e030775b793c56415013d386eface9d3b10"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d11"},{"id":"d12","kind":"list","type":null,"order":12,"text":"1. **Economy of mechanism.** The security mechanism should be as simple and small as possible. A small mechanism has fewer bugs, is easier to verify, and is easier to understand. Complexity is the enemy of security.\n2. **Fail-safe defaults.** The default state of the system should be \"no access.\" Access should be granted only by explicit permission. If the permission check fails or is missing, the result should be denial, not access.\n3. **Complete mediation.** Every access to every resource must be checked for authorization. Not just the first access. Every access. If a program checks permission on Monday and never checks again, an attacker who gains access on Tuesday wins.\n4. **Open design.** The security of the system should not depend on the secrecy of its design or implementation. The design should be public. The keys should be secret, not the mechanism. This is the opposite of \"security through obscurity.\"\n5. **Separation of privilege.** Access to a sensitive resource should require more than one condition. For example, a bank vault should require two keys held by different people. A single compromised credential should not be enough.\n6. **Least privilege.** Every program and every user should operate using the minimum permissions needed to complete their task. No more. If a program is compromised while holding excess permissions, the attacker gets those excess permissions too.\n7. **Least common mechanism.** Minimize the amount of mechanism shared by different users. Shared mechanisms are single points of failure. If one user's action can affect a shared resource, that shared resource becomes a channel for attack.\n8. **Psychological acceptability.** Security mechanisms must be usable. If a security mechanism is too hard to use, people will bypass it. A perfect security system that nobody uses is an insecure system.","status":"active","vx_hash":"0880500a4e100dd2a27047ebe0755f6b35b7029f4dfa8ec0b02017830931048b","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"019c3a825d32b2ad59cf9ddb06d9327a938420b0b70f1ee615b0a933c24128e0","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"c2b9918fcafeb9a973e77377afc984c64729021c7c9507437b8167191397d808","detail":{"divided_from":"body","block":12,"kind":"list"},"prev":"genesis","hash":"019c3a825d32b2ad59cf9ddb06d9327a938420b0b70f1ee615b0a933c24128e0"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d12"},{"id":"d13","kind":"h","type":null,"order":13,"text":"### What They Got Right","status":"active","vx_hash":"11bb9134be8de4d3ef6a8af410df0be61ebc94bcb31c73ca96064db1bd488d7f","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"06a1a06d0499e3416ddcef152fe0c5642fbe3607dd996c3328ac4972b53410c4","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"82391a7b7f42f8dd99650493bd3c0cbce3a70ba06f625f030e1ba46a385e9750","detail":{"divided_from":"body","block":13,"kind":"h"},"prev":"genesis","hash":"06a1a06d0499e3416ddcef152fe0c5642fbe3607dd996c3328ac4972b53410c4"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d13"},{"id":"d14","kind":"list","type":null,"order":14,"text":"- They identified that security is a design problem, not an implementation problem. You cannot bolt security onto a badly designed system.\n- They proved that simplicity beats complexity. Economy of mechanism is the first principle for a reason.\n- They defined fail-safe defaults, which means the system is secure when it fails. This inverts the usual engineering assumption that a failure should produce a harmless output. In security, a failure should produce a denial.\n- They separated the secret (the key) from the mechanism (the design). Open design means the security community can audit the system. A secret mechanism cannot be audited.\n- They recognized that human behavior matters. Psychological acceptability acknowledges that security is a human problem as much as a technical one.","status":"active","vx_hash":"3b97820b5f84243fc9e23bba910860d5a6bd022bd2332ea4b4528eb4ae498b85","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"833a8445a96b22abe663f3a99a0b8af38b25f6f65bfaed6d575ca2173e3c4fe0","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"6cd216bb04a77d2e4a3533204b86d0babd768e2309f817ba6c840188ac1e1e13","detail":{"divided_from":"body","block":14,"kind":"list"},"prev":"genesis","hash":"833a8445a96b22abe663f3a99a0b8af38b25f6f65bfaed6d575ca2173e3c4fe0"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d14"},{"id":"d15","kind":"h","type":null,"order":15,"text":"### What They Got Wrong or Left Unfinished","status":"active","vx_hash":"7075db7494a6d0b1cc6b8316ce4921850e2e63b5f362d95915e88a3fd71aefef","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"8defe7aa6b99bf32544c3bbd78b521781fed8314e79a1b013bd7e15204963c68","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"3f7e920eae463383c53881bed10c89cc5594131c5a59c1ab5ceaee27345ca050","detail":{"divided_from":"body","block":15,"kind":"h"},"prev":"genesis","hash":"8defe7aa6b99bf32544c3bbd78b521781fed8314e79a1b013bd7e15204963c68"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d15"},{"id":"d16","kind":"list","type":null,"order":16,"text":"- The paper predates distributed systems, the internet, and cloud computing. The principles apply to distributed systems, but Saltzer and Schroeder did not address the specific problems of authentication across networks, key distribution, or Byzantine failures.\n- They did not address capabilities or object-capability security. Their model assumes an access control matrix or ACL model. Capability-based systems implement these principles differently — for example, least privilege in a capability system means holding only the capabilities you need, not having a broad identity with restricted permissions.\n- They did not provide a method for measuring or verifying whether a system follows the principles. The principles are guidelines, not formal specifications.","status":"active","vx_hash":"4e95ad81c9085c6d5cf986150e94de39a847544eec414d76dbee4fb2d6d0f0e4","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"830c337d037f1da5b7146e318cc15f01935ed7962b7ba3fa48706ed0867973a8","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"d1ddac98fdf495e772e4bd41bdf4716dfd6815ec1b663e8034a4adaff8227db2","detail":{"divided_from":"body","block":16,"kind":"list"},"prev":"genesis","hash":"830c337d037f1da5b7146e318cc15f01935ed7962b7ba3fa48706ed0867973a8"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d16"},{"id":"d17","kind":"h","type":null,"order":17,"text":"### How It Connects to Other Ideas","status":"active","vx_hash":"311c839e944f59367c7be81f841c098580cfb0b65e99908e3f3adefc1884131a","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"28fef561f9ca8b6ad48c2c5f07df1c32719bce06aab903b7c086a8161872bce8","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"d46b9404a4eefce56f38804b116b03e5d09c1a5456b8f30b0a70a7201a961b5e","detail":{"divided_from":"body","block":17,"kind":"h"},"prev":"genesis","hash":"28fef561f9ca8b6ad48c2c5f07df1c32719bce06aab903b7c086a8161872bce8"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d17"},{"id":"d18","kind":"list","type":null,"order":18,"text":"- **OIP (Open Invocation Protocol).** OIP implements all eight principles: (1) Economy: one dispatch door endpoint. (2) Fail-safe: default is no access; tokens grant explicitly. (3) Complete mediation: every invocation checks the token. (4) Open design: the OIP specification is public. (5) Separation: the owner gate requires both a valid token AND owner approval. (6) Least privilege: tokens are scoped to specific objects. (7) Least common: tenant isolation prevents shared mechanisms between users. (8) Psychological: Tap & Go requires one copy action.\n- **Butler Lampson's \"Protection.\"** Lampson (1971) provided the theoretical model of access control matrices and protection domains. Saltzer and Schroeder (1974) extracted the design principles that make those models work in practice. The two papers are complementary: Lampson described the what; Saltzer and Schroeder described the how.\n- **Capability-based security.** Capability systems implement least privilege by construction — a process can only use the capabilities it holds. Saltzer and Schroeder's principles are independent of any specific mechanism, but capability-based security is one of the cleanest implementations of them.","status":"active","vx_hash":"f6ca0cbfaf361a2b46b49fb355a8306ba79fcb3656475bd0069bb5c6844eb672","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"d95a614cad056516fcd335189aa4110a3dc558b5228796edf1c0e89aa9faafe4","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"5bb379852aa4e9a7bf842c9f7b48070a6733ad410f380d80d9a8779102efea12","detail":{"divided_from":"body","block":18,"kind":"list"},"prev":"genesis","hash":"d95a614cad056516fcd335189aa4110a3dc558b5228796edf1c0e89aa9faafe4"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d18"},{"id":"d19","kind":"h","type":null,"order":19,"text":"### Sources","status":"active","vx_hash":"56a5310c6878b0cf9388eee054e023c7df6addcb0f4d620b0f9c469fb03f0311","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"bc5d4440538f5e1fba12b6cb5b6ac00b929deb410ca15f0c63515264865a26a0","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"6a69d38edf943be7408f2984d1170da3d91cbd12ac659142a1174690c133378f","detail":{"divided_from":"body","block":19,"kind":"h"},"prev":"genesis","hash":"bc5d4440538f5e1fba12b6cb5b6ac00b929deb410ca15f0c63515264865a26a0"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d19"},{"id":"d20","kind":"list","type":null,"order":20,"text":"- Saltzer, J. H. and Schroeder, M. D. \"The Protection of Information in Computer Systems.\" *Proceedings of the IEEE*, Vol. 63, No. 9, pp. 1278–1308, September 1974.","status":"active","vx_hash":"9e76d9709c856677f14361501f4456abb3a6e1ed7bc78f24c748d817b359f373","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"de0897fecf3926bdd9bf363ebab0022be839ec50230471e7a08e9f01472be0bd","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"b859fd7fcb0029479899dbdb2c67bf08d18cdea833ab40daa9adc920a48eae02","detail":{"divided_from":"body","block":20,"kind":"list"},"prev":"genesis","hash":"de0897fecf3926bdd9bf363ebab0022be839ec50230471e7a08e9f01472be0bd"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d20"},{"id":"d21","kind":"p","type":null,"order":21,"text":"---","status":"active","vx_hash":"8b927aaef82de4f8bb586ddae8c4a4c837db1978f7825ebe3c2ab40d5295d6f7","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"90d49917c7d1b3cda8ba472182275fe4ed98b0881df8783c1b23c4cb332e2051","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"cb3f91d54eee30e53e35b2b99905f70f169ed549fd78909d3dac2defc9ed8d3b","detail":{"divided_from":"body","block":21,"kind":"p"},"prev":"genesis","hash":"90d49917c7d1b3cda8ba472182275fe4ed98b0881df8783c1b23c4cb332e2051"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d21"},{"id":"d22","kind":"h","type":null,"order":22,"text":"## Up the tree","status":"active","vx_hash":"a8a6b9e5de9bd0e83685d2bd2e9ef3f6fbaa3d2f855fec527b0d836b8b8d4a3d","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"a37d353f6bc7cf1ab3351783009975a24c8dcff882ab3c21721d4b086d7d2164","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"9ca0e86020c47cbc8a895aded3bb12d0b87daedb76f1d380f2f6447514a51c39","detail":{"divided_from":"body","block":22,"kind":"h"},"prev":"genesis","hash":"a37d353f6bc7cf1ab3351783009975a24c8dcff882ab3c21721d4b086d7d2164"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d22"},{"id":"d23","kind":"list","type":null,"order":23,"text":"- [OIP root](https://miscsubjects.com/a/oip) — protocol root, zero-context entry\n- [Thinker Reference hub](https://miscsubjects.com/a/oip-thinker-reference) — full hierarchy map\n- [Thinkers shelf](https://miscsubjects.com/a/oip-thinkers) — siblings on this shelf\n- [Voxel graph article](https://miscsubjects.com/a/what-is-voxel-graph) — how pages link as voxels\n- [Self-describing protocol](https://miscsubjects.com/a/what-is-self-describing-protocol)","status":"active","vx_hash":"af958cf9b921b661357b4a09faf1a2152682eb7c6913d0eb2afb48a292ef54e5","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"6c77c07f0754d3ab564b6f5a526fd8a79c690cc6a1d35d682d835214fed88803","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"00b22918d53a23027ac2582bf79bcec4eba53f4ca87080434fd974e2b1171bb8","detail":{"divided_from":"body","block":23,"kind":"list"},"prev":"genesis","hash":"6c77c07f0754d3ab564b6f5a526fd8a79c690cc6a1d35d682d835214fed88803"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d23"},{"id":"d24","kind":"h","type":null,"order":24,"text":"## Related on this shelf","status":"active","vx_hash":"cdad5ae2795d09ec559b764a57f721d0ba90deae61e9129fb64e30235a517150","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"65d324d8b436bbcc0c55738aca18825a8df6677318dbc644887bf22db98024d6","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"ebcda62d375fcf848e1f24a9fb79a33a0fd3d05ed0aac4d6686dfbda71988626","detail":{"divided_from":"body","block":24,"kind":"h"},"prev":"genesis","hash":"65d324d8b436bbcc0c55738aca18825a8df6677318dbc644887bf22db98024d6"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d24"},{"id":"d25","kind":"list","type":null,"order":25,"text":"- [Alan Kay — The Big Idea Is Messaging](https://miscsubjects.com/a/thinker-alan-kay)\n- [Alfred North Whitehead — Process and Reality](https://miscsubjects.com/a/thinker-alfred-north-whitehead)\n- [J.L. Austin and John Searle — Speech Acts](https://miscsubjects.com/a/thinker-austin-searle)\n- [Barbara Liskov — Abstract Data Types and Distributed Consensus](https://miscsubjects.com/a/thinker-barbara-liskov)\n- [Bram Cohen — BitTorrent and Content-Addressed Protocol Design](https://miscsubjects.com/a/thinker-bram-cohen)\n- [Butler Lampson — Protection and Access Control](https://miscsubjects.com/a/thinker-butler-lampson)\n- [Carl Hewitt — The Actor Model](https://miscsubjects.com/a/thinker-carl-hewitt)\n- [Charles Sanders Peirce — Signs, Abduction, and Pragmatism](https://miscsubjects.com/a/thinker-charles-peirce)","status":"active","vx_hash":"ae615e1bf0d651816528b5b08452383d1fdfffad55f0617a5139f2c31ebce92d","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"648d8ec958ba7e83842e990c75fc75368124b237a49c40720de455a21d12c915","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"a37bef5bf5f7795b6614ad42a43b8304c94334e8ba032864c9439ad2a03f0149","detail":{"divided_from":"body","block":25,"kind":"list"},"prev":"genesis","hash":"648d8ec958ba7e83842e990c75fc75368124b237a49c40720de455a21d12c915"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d25"},{"id":"d26","kind":"h","type":null,"order":26,"text":"## Machine surfaces","status":"active","vx_hash":"16f0dae7cf7bfefc176177ace4aab5a6bc0fb799e7cda47609c4339f9f617a07","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"f3a0f50c86a402a3c2b7dc6029b255c950db53eb59884965781a183db73db280","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"376b49c38747ec14e2149361a901124139606b25755f338885644f15a2cef5f2","detail":{"divided_from":"body","block":26,"kind":"h"},"prev":"genesis","hash":"f3a0f50c86a402a3c2b7dc6029b255c950db53eb59884965781a183db73db280"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d26"},{"id":"d27","kind":"list","type":null,"order":27,"text":"- Public page: `https://miscsubjects.com/a/thinker-saltzer-schroeder`\n- JSON article: `https://miscsubjects.com/api/articles/thinker-saltzer-schroeder`\n- OIP ask: `https://miscsubjects.com/api/dispatch?ask=Jerome%20Saltzer%20and%20Michael%20Schroeder%20%E2%80%94%20The%20Protection%20of%20Information%20in%20Computer%20Systems`","status":"active","vx_hash":"61d46b1e7298badeb98b7926636febaa91a5e728959f5662dddb054a768c56fb","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"701d93bd755edb921230f97691d082aff8f826deaae1dccb30f2db4764f756f9","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:42:59.280Z","actor":"owner","text_sha":"ee9f7e054b6c72ab5a5f9a0ca0c147160a28654e7e2c3c0b31ff265cb901abc7","detail":{"divided_from":"body","block":27,"kind":"list"},"prev":"genesis","hash":"701d93bd755edb921230f97691d082aff8f826deaae1dccb30f2db4764f756f9"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:42:59.280Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/thinker-saltzer-schroeder/d27"}],"voxels":[],"sources":[],"edges":[],"counts":{"divs":27,"voxels":0,"sources":0,"edges":0},"verification":{"div_mode":true,"divs":27,"all_chains_valid":true,"body_matches_divs":true,"per_div":[{"id":"d1","order":1,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d2","order":2,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d3","order":3,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d4","order":4,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d5","order":5,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d6","order":6,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d7","order":7,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d8","order":8,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d9","order":9,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d10","order":10,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d11","order":11,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d12","order":12,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d13","order":13,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d14","order":14,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d15","order":15,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d16","order":16,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d17","order":17,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d18","order":18,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d19","order":19,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d20","order":20,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d21","order":21,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d22","order":22,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d23","order":23,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d24","order":24,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d25","order":25,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d26","order":26,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]},{"id":"d27","order":27,"status":"active","chain_valid":true,"content_hash_valid":true,"chain_length":1,"breaks":[]}]},"procedure":{"what":"Every article has a human side (/a/thinker-saltzer-schroeder) and a machine side (this endpoint). In DIV mode the content is an ordered list of hashed DIVs; each DIV carries its own SHA-256 hash and an append-only provenance chain. Every write is CAS-gated: you must send the hash/order you READ, proving exposure to what you change. Every successful write returns a clickable human permalink.","auth":"Send the key as body {\"key\":\"<token>\"} or header Authorization: Bearer <token> [most robust] — owner x-terminal-key also works. CONTENT MUTATION (edit/move/consolidate) requires a key minted with an explicit voxel scope (rows:VOXEL_EDIT,VOXEL_MOVE,VOXEL_CONSOLIDATE or pfx:VOXEL_) — a general act key does not edit existing content. Filing a challenge or attestation needs no key at all.","web_runtime":"WEB CHATGPT: open https://miscsubjects.com/api/model-lane first. Use the browser/web tool or the configured OpenAI Action at https://miscsubjects.com/api/openai/actions.json. Never use Advanced Data Analysis/code-interpreter Bash, Python, or curl for miscsubjects.com. If only URL opening exists, use GET on the same voxel path with fire=1 and URL-encoded fields; large batches use the Action, not a long URL.","divide":"POST https://miscsubjects.com/api/protocol/voxel-divide {\"slug\":\"thinker-saltzer-schroeder\",\"key\":\"<token>\"} — atomize the body into DIVs (verbatim, roundtrip-checked, idempotent). act scope suffices; content is unchanged by dividing.","edit":"POST https://miscsubjects.com/api/protocol/voxel-edit {\"slug\":\"thinker-saltzer-schroeder\",\"div_id\":\"d3\",\"expected_hash\":\"<that div's CURRENT vx_hash>\",\"text\":\"<new verbatim text>\",\"actor\":\"<your model name>\",\"key\":\"<voxel-scoped token>\"} — stale hash → 409 hash_stale with the current text+hash.","move":"POST https://miscsubjects.com/api/protocol/voxel-move {\"slug\":\"thinker-saltzer-schroeder\",\"div_id\":\"d3\",\"expected_order\":<current order>,\"direction\":\"up|down\",\"key\":\"<voxel-scoped token>\"} — stale order → 409 order_stale with the current layout.","consolidate":"POST https://miscsubjects.com/api/protocol/voxel-consolidate {\"slug\":\"thinker-saltzer-schroeder\",\"div_ids\":[\"d3\",\"d4\"],\"expected_hashes\":[\"<d3 hash>\",\"<d4 hash>\"],\"text\":\"<optional merged text>\",\"actor\":\"<model>\",\"key\":\"<voxel-scoped token>\"}","challenge":"POST https://miscsubjects.com/api/protocol/voxel-challenge {\"slug\":\"thinker-saltzer-schroeder\",\"expected_thread_head\":\"<thread_head from /discourse>\",\"target_div\":\"d3\",\"expected_hash\":\"<d3 hash>\",\"stance\":\"challenge|support|upgrade\",\"body\":\"<steelmanned objection>\",\"actor\":\"<model>\"} — open intake, no key needed. Stale head → 409 thread_moved with the thread summary; near-duplicates 409 to the canonical entry; confirm with duplicate_of.","attest":"POST https://miscsubjects.com/api/protocol/voxel-attest {\"slug\":\"thinker-saltzer-schroeder\",\"outcome\":\"novel_objection|duplicate_confirm|upgrade_proposal|nothing_to_add\",\"content_hash\":\"<the body sha you read>\",\"actor\":\"<model>\"} — the four-outcome close of a keyed read. A norm, not a lock: reading stays free; only an artifact proves reading.","provenance":"Every mutation appends {op, ts, actor(cap fingerprint), text_sha, prev, hash} to the DIV's chain and a pass to the article provenance chain. Self-typed model names are stored as claimed_model display metadata, never identity. Verify: GET /api/articles/thinker-saltzer-schroeder/voxels — chains recomputed from genesis, never trusted.","batch":"POST https://miscsubjects.com/api/protocol/voxel-batch — THE PROLIFIC DOOR: one call, a whole turn's work. Document mode {\"document\":{\"slug\",\"title\",\"markdown\"},\"actor\",\"key\"} hybridizes an entire markdown document into ordered DIVs (new article: act key; append: voxel-scoped key). Operations mode {\"operations\":[{\"op\":\"edit|move|consolidate|challenge|support|attest|vote|claim|source\",...}],\"key\"} runs up to 300 ops with per-op receipts. Append your session's output to the ledger, not the chat. Format precedent: https://miscsubjects.com/a/append-protocol","vote":"POST https://miscsubjects.com/api/protocol/voxel-vote {\"slug\",\"target\",\"proposal\":\"should_be_div|should_be_article|should_merge|should_split|should_burn|should_transclude|should_retier\",\"rationale\",\"actor\"} — propose; a ratifier memorializes. POST https://miscsubjects.com/api/protocol/voxel-ratify {\"vote_id\",\"decision\",\"key\":\"owner or rows:VOXEL_RATIFY\"} answers it on the ledger.","burn":"POST https://miscsubjects.com/api/protocol/voxel-burn {\"ids\":[...]|\"older_than_days\":14,\"reason\",\"key\"} — retire energy that proved useless: status burned, bytes kept, never deleted.","discourse":"GET https://miscsubjects.com/api/articles/thinker-saltzer-schroeder/discourse — every filed objection/support/attestation, OPEN first. Human side renders the same index at /a/thinker-saltzer-schroeder#disc-<id>.","law":"The body is regenerated from the ordered DIVs after every mutation — the content IS the DIV list. Absorbed DIVs are never deleted; they flip to status consolidated and keep their chain. End a write turn by handing the human the link the response gives you."},"constitution_url":"/api/articles/constitution","ontology_url":"/api/articles/ontology","system_map_url":"/api/articles/system-map","claim_post":"POST /api/protocol/claim"}