Posts
cr.yp.to: 2025.04.23: McEliece standardization
Threema has deployed a new multi-device protocol
Sneak peek: A new ASN.1 API for Python
Resurrecting an old topic - does Snapchat employ E2EE?
I posted this (or similar) article awhile ago: https://www.bbc.com/news/world-europe-68056421 TL;DR: British person sends a message in SnapChat *"On my way to blow up the plane (I'm a member of the Taliban)."* in a group chat with friends as a joke at Gatwick airport (via the WiFi) before departing. UK authorities …
What’s the minimal size of a nonce leakage so that the private can be recovered from a single signature ?
There’re a lot of papers on how to recover a private key from a nonce leakage in a ᴇᴄᴅꜱᴀ signature. But the less bits are known the more signatures are required. Now if I don’t know anything about private key, how much higher order or lower order bits leakage are …
I published this e2ee library a while back and am interested in feedback.
[historical, WWII] Seeking an original SIGSALY keying one time phonographic record (or good recording of it) for purpose of constructing an end to end software emulator of this groundbreaking vocoder based scrambling system.
The [SIGSALY Wiki page](https://en.wikipedia.org/wiki/SIGSALY) and its references are helpful to describe essentials of this 50 ton vacuum tube behemoth that was the first one time pad vocoder scrambler system ever used. It was digital in a real sense but not strictly boolean. The keying stream was presented by one of …
Draft: Hybrid Post-Quantum Password Authenticated Key Exchange
Books about ARQC cryptograms / payment protocols? too niche?
I've been searching for books on payments cryptographic protocols. I've looked at Schneier Cryptography Engineering and some other generic books and there's nothing around the actual protocols used between payment devices and issuing and acquiring HSMs. I've found Ross Anderson talks and book (https://www.cl.cam.ac.uk/archive/rja14/Papers/SEv3-ch12.pdf) as an intro, but it does …