What I would like, but haven’t found yet, is a cheat sheet on what up to date encryption method or algorithm one should use for whatever need. A kind of requirement -> algorithm dictionary.<p>Like, I need to authenticate that a client is a known identity. What algo? How to use it? What to avoid? I need to sign a message or document. How? I need to verify said message. How? I need to store passwords. How?<p>I know some crypto, but discovering and learning about them is a bit of a pain. For how important crypto is, you‘d think someone would have bothered to teach developers how to choose and deploy these algorithms properly.
It's not new, and some people would disagree on some minor elements -- but a good place to start was regularly this blog from approximately Matasano/NCC Group members, called Cryptographic Right Answers [1]. It's very clear, gives straight forward answers in clear fashion -- and with multiple opinions often aligning.<p>It was updated a few times, I wonder if the equivalent exists for PQ?<p>Edit/Update: Found the PQ one @ [2], definitely check it out!<p>Maybe I'm mis-remembering, but perhaps the most controversial element was the regular recommendation of AES-GCM. It certainly has excellent security properties, but also a certain brittleness re: nonces.<p>[1] <a href="https://www.latacora.com/blog/2018/04/03/cryptographic-right-answers/" rel="nofollow">https://www.latacora.com/blog/2018/04/03/cryptographic-right...</a>
[2] <a href="https://www.latacora.com/blog/2024/07/29/crypto-right-answers-pq/" rel="nofollow">https://www.latacora.com/blog/2024/07/29/crypto-right-answer...</a>
If your needs are this simple, you may be better served by an opinionated crypto library like Monocypher [0] or libsodium [1]. Just look at the latter's FAQ page and you'll see they're taking your approach targeting developers, not cryptographers.<p>They'll provide you one blessed algorithm for every primitive with secure alternatives if your use-case demands them. XChaCha20-Poly1305 for encryption, EdDSA for signatures, X25519 for key exchange, BLAKE2b for a hash, Argon2i for a KDF.<p>[0] <a href="https://monocypher.org/" rel="nofollow">https://monocypher.org/</a><p>[1] <a href="https://doc.libsodium.org/doc/quickstart" rel="nofollow">https://doc.libsodium.org/doc/quickstart</a>
Google’s Tink crypto library had a slightly technical page to help with that: <a href="https://developers.google.com/tink/choose-primitive" rel="nofollow">https://developers.google.com/tink/choose-primitive</a>