r/crypto

Apps shouldn't let users enter OpenSSL cipher-suite strings

Why the minimal embedding field can’t be smaller than the embedding degree when the characteristic from the binary curve is large ?

I was reading [this paper](https://eprint.iacr.org/2006/415.pdf) that describe how to find an embedding field which is smaller than the one from the embedding degree. But why the method doesn’t work when the characteristic is large (I fail to understand the paper on such point) ?

Join us next week Thursday on July 3rd at 2PM CEST for an FHE.org meetup with Olivier Bernard, Cryptology researcher at Zama presenting "Bootstrapping (T)FHE Ciphertexts via Automorphisms: Closing the Gap Between Binary and Gaussian Keys".

Longfellow-zk (google-zk)

Remember when recently Google made headlines announcing its privacy-preserving technology based on zero-knowledge proof for mobile digital wallets? I was granted access to their the C++ implementation code and here is my independent analysis of it.

Uncovering the Phantom Challenge Soundness Bug in Solana's ZK ElGamal Proof Program

Comments on Rijndael-256-256 and similar ciphers

Professional help for < $1000?

We periodically get developers asking for *'is it okay if I use this construction'* advice for projects that are meant to be widely used. Who exactly is available to give actual "I do this for a living" guidance to people like that, without breaking the bank?

Help with Cryptohack challenge

I'm extremely novice to cryptography challenges, and more so to python. For the following course challenge: https://preview.redd.it/epptf5u2ak8f1.png?width=1206&format=png&auto=webp&s=9c52b1f9b1d2419d6451f08feef2e733db6df32f I've written the following program. https://preview.redd.it/rq0s2rm4ak8f1.png?width=971&format=png&auto=webp&s=cab457b4b04374ad8e1c00e84e45be8b656dc1f6 Is there something wrong with my approach? I've watched some videos on it but I'm stuck

Shamir Secret Sharing + AES-GCM file encryption tool - seeking cryptographic review

I've built a practical tool for securing critical files using Shamir's Secret Sharing combined with AES-256-GCM encryption. The implementation prioritizes offline operation, cross-platform compatibility, and security best practices. # Core Architecture 1. Generate 256-bit AES key using enhanced entropy collection 2. Encrypt entire files with AES-256-GCM (unique nonce per operation) …

Join us next Thursday on June 19th at 4PM CEST for an FHE.org meetup with Alexandra Henzinger, graduate student at MIT presenting "Somewhat Homomorphic Encryption from Sparse LPN".