Cryptography on Alexander Romanovhttps://purplehootie.com/tags/cryptography/Recent content in Cryptography on Alexander RomanovHugoen-usFri, 24 Jul 2026 00:00:00 +0000Signed provenance for MCP tool results: the envelope, and the consumer that actshttps://purplehootie.com/posts/mcp-signed-trust-envelope/Fri, 24 Jul 2026 00:00:00 +0000https://purplehootie.com/posts/mcp-signed-trust-envelope/A signed trust envelope for MCP tool results, and the independent consumer that verifies it and refuses - across eight attacks including a live man-in-the-middle. What the signature proves, what it doesn't, and where I had to find another way.