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The official AES test vectors look incorrect
No way they can be, right? _(Edit: see comments, problem was between chair and keyboard. Thanks!)_ I'm currently writing yet another AES implementation. My goal is to have a bitslice implementation, similar to BearSSL, but with a nicer API. Anyway, right now I'm making a simple, slow, unsafe (variable time) …
Steganographically encode messages with LLMs and Arithmetic Coding
Best beginner cipher to try to solve?
Hi. As title goes, I’m getting into cryptography I’d like to know if there’s any online puzzles or beginner ciphers I can try to solve to start getting into this. Thanks
Offline path to unencrypt a DPAPI encrypted string?
Greetings Crypto Sub! I am dealing with a kind of cryptolocker situation... Not \_that\_ bad, but kinda bad. Data that is encrypted out of my reach: \~8 years of Signal Desktop data (including family photos and much else). How it went beyond reach: In late 2024, Signal Desktop started encrypting …
Caesar Cipher Question
Why does the [dCode.fr](http://dCode.fr) website for Caesar Cipher result in two or more answers for strings I want to decode? Shouldn't there be only one way to shift using key 3? I can't find the answer anywhere. Please help!
Let’s talk about AI and end-to-end encryption
Hybrid key-exchange with PQ-KEM algorithms
I am working on a security-critical tool that uses ECDH to establish shared session keys. I want to reinforce this process by using a PQ-KEM algorithm like Kyber. Right now, I am thinking of achieving this by having two independent key exchanges (one with ECDH keys and one using the …
Probability of randomly generating an EC public key
From what I understand the size of a secp256k1 EC public key is 65 bytes (out of which one is a prefix byte so lets ignore that). The private key is any 256-bit number in [0, N] where N is the order of the curve. So if I have a …
Fully Homomorphic Encryption Survey
Hi, please fill out Lattica's FHE survey [https://forms.gle/UA4LrVKhkWgENeGS9](https://forms.gle/UA4LrVKhkWgENeGS9). This survey gathers insights from industry experts about the current state and future development of Fully Homomorphic Encryption. Survey results will be widely available here and on social media. Thanks - your insights are super valuable! https://preview.redd.it/i7dprkewabfe1.jpg?width=3158&format=pjpg&auto=webp&s=1c0a7213b21a4f7d84a7adfcfe9034dbd9635fe5