logos-messaging/specs
1
0
Fork 0
mirror of https://github.com/logos-messaging/specs.git synced 2026-01-02 06:03:08 +00:00
Code Issues Packages Projects Releases Wiki Activity

expanded rki

Browse Source
This commit is contained in:
Jazz Turner-Baggs 2025-09-25 13:48:34 -07:00 committed by GitHub
parent 1a46d4bf8c
commit 3d4eac0fa4
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 4 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
standards/application/inbox.md
View File

@ -126,7 +126,10 @@ The noise handshake is implemented with the following functions:
DH: X25519 cipher: AEAD_CHACHA20_POLY1305 hash: BLAKE2b
## Recipient Key Identifer
Recipients need to know which ephemeral public key was used in the senders noise handshake. To communicate this, senders include a short identifier for the key.
When receiving a payload it is initially unclear which Recipients ephemeral key was used by the sender in the noise handshake.
The Recipient sends their ephemeral key out of band, and there may exist many such keys. The recipient could exhaustively attempt decryption with it's available keys however this is potentially inefficient. Additionally in the case of decryption failure, its ambiguious whether the ephemeral keys was never valid or has expired/consumed.
To make this efficient, the Sender includes a short identifier for the key.
Calculated as: `blake2b(utf8ToBytes('WAP') || K)`[0..4]