r/crypto
Posts
Why are Montgomery and twisted Edwards curve said to be all quadratic twist secure ?
Simple question. According to SafeCurve, all twisted Edwards and Mongomery curves are quadratic twist secure. But why ?
modular sqrt(Q) in elliptic curves over F, where Q is a point and not an integer?
Book for introduction to cryptography
I am looking for a book for beginners, explaining all the concepts for key sharing, block and stream ciphers, vulnerabilities, polygons, where primes come in the picture, etc. Possibly supplemented with examples, as well as real-world ciphers and how they are distinct, what makes them special etc. I read a …
Do all points of secp256k1 have the same order as standard G's one?
``` G_Coordinates = (0x79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798, 0x483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8) ``` and knowing that we are in `x^3 + 7` and knowing that the modulus is ``` p = 0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f ``` than we can calculate the order of point G ``` n = 0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141 ``` but do all valid point coordinates on secp256k1's field have …
If Grovers "roots" the bit strength of hash functions/sym crypto, what does shors do to ECC?
I appreciate modern ECC is essentially only as strong as half the bit strength of the curve group (subgroup) due to Pollard's Rho. Given Grovers essentially roots the bit strength of hash functions and symmetric crypto (256->128), what does it do to ECC? Do we have an intuition as to …
Looking for encrypted object formats
I'm looking for prior art in encrypted object formats intended for encryption at rest (or store and forward messaging) for objects in the kilobytes to gigabytes range. Most probably involve marshalling together some symmetrically encrypted data along with a metadata block that includes details on key management and transports the …
The best visual representations of elliptic curves on finite fields you are aware of
Hi guys, in few words: my head wraps around visual representations way way way easier than math math models and watching visual presentations (better if they are interactive) makes my knowledge more flexible. I'm aware of the representation of the curve on the Real filed, it is very clear of …
Storing libsodium private keys on disk
Hi everyone, I want to use libsodium in PHP in a little code signing/verifying library I'm writing. I had a working implementation in OpenSSL, but that extension isn't always installed on hosts, where it seems that libsodium mostly is. The API seems pretty straightforward, with one exception - how does …
Excited to share my latest research in Privacy Preserving Authentication technology!
🌟 **Dear Scientists, Researchers, Scholars, and Enthusiasts,** 🌟 I am **thrilled** to announce the pre-print of my latest research paper, now available on the [International Association for Cryptologic Research (IACR) ePrint archive](https://eprint.iacr.org/2024/2066). 📚✨ >**Goal**: To authenticate accurately and securely **without revealing both virtual public identifiers** (e.g., usernames, user IDs) **and …