Fooling around with encrypted reasoning blobs
- ID: b2ef3d86
- Original: https://blog.cryptographyengineering.com/2026/05/29/fooling-around-with-encrypted-reasoning-blobs
- Added: 2026-08-12
- Source: blog / Matthew Green
- Original Date: 2026-05-29
- AAIF Category: models
- Quality Score: 4
- Status: active
- Source Type: article
- Language: en
- Tags: encrypted-cot, cryptography, llm-api, session-sharing
中文摘要
Matthew Green 在 2608.09867 论文公开前两个月写下的背景笔记，把 encrypted reasoning blob 视作把服务端保密负担转嫁给客户端的工程决策，并指出 blob 在客户端持有期间能被复制再分发跨请求复用这是后续跨 session 可移植攻击和 decryption 漏洞的前提该笔记被 8-11 的 kotekjedi thread 与论文引用，作为密码学界对 frontier 模型架构选择的早期标注
English Summary
Matthew Green's May 2026 background post predates the 2608.09867 paper by two months. He frames the encrypted-reasoning-blob design as shifting the confidentiality contract from the server to the client, and flags that blobs held by the client can be copied, redistributed, and reused across requests - the precondition the later paper turns into a portable cross-session attack and decryption jailbreak. The post is the cryptographic community's earlier marker of the same architectural trade-off.
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