Posts
Instagram quietly drops end-to-end encrypted chats
Swiss e-voting pilot can't count 2,048 ballots after USB keys fail to decrypt them
How "Strengthening Crypto" Broke Authentication: FreshRSS and bcrypt's 72-Byte Limit
Are there different methods for lifting a point to an eilliptic curve point to a suitable hyperelliptic curve cover than Weil descent?
I ve a curve defined on an extension field but with a point coordinate lies in the base prime field (same coordinate as the prime field version of the curve) As you know, in the case of applying index calculus, this is largely regarded as impossible as the Weil descent …
Do esoteric blockchain paradigms count as "not about cryptocurrency?"
Background. On February 5, 2026, Claude Opus 4.6 was released. And it was announced that they wrote a C compiler, poorly. Lots of fair criticism about C being a well documented language, and having a lot of training data to make it "easy." Fair point. So I decided to pull …
I read there re cases where the final exponentation on elliptic curves pairings is easy to invert, but is it true?
I read that for some curve this is possible with the text being specifically, if `$\gcd((p^k-1)/r, r) = 1$, the final exponentiation is a bijection on the r-torsion and can be inverted by computing the modular inverse of the exponent modulo r`. But is it true as it seems such …
It should be inherently sequental proof of work with
Hello, I try to make proof of works that cannot be speedup dramatically by large resource, and all parameters are public. It can be useful for antibot or spam. This is post to continue what I'm trying to make in my [previous post](https://www.reddit.com/r/crypto/comments/1rho576/hash_based_verifiable_delay_function_with_simple/). And now I did a major overhaul …
Looking for review of a deterministic encryption scheme for version-controlled Markdown
I built a tool called [mdenc](https://github.com/yogh-io/mdenc) that encrypts Markdown files at paragraph level so they can be stored in git with meaningful diffs. The core idea: unchanged paragraphs produce identical ciphertext, so only edited paragraphs show up in version-control diffs. There's a [live demo](https://yogh-io.github.io/mdenc/) where you can try it -- …
Review request: Offline tool for Shamir's Secret Sharing with focus on generating and managing X.509 root certificates
# Background I think most of us have been here, setting up a root CA for one reason or the other and have asked the question: How do I store this safely? Both in terms of not having anyone steal it and not losing it. I have known about the …
I built a commitment scheme web app using HMAC-SHA256 with Bitcoin timestamps via OpenTimestamps — open source, MIT licensed
I built **PSI-COMMIT**, an open-source web app that implements a cryptographic commitment scheme. The idea: commit to a message now, reveal it later, and mathematically prove you didn't change it after the fact. **How it works:** Your browser generates a 256-bit random key and computes `HMAC-SHA256(key, domain || nonce || …