r/crypto

[Cryptanalysis] Theoretical reduction of logical depth (T-count) for Shor's algorithm via Z/6Z Topological Superselection (with exact MPDO simulation)

Hi everyone, I am an independent researcher and I recently published a theoretical paper focusing on quantum cryptanalysis, specifically targeting the resource estimation and initialization phase of arithmetic search algorithms like Shor's. Since this sub focuses heavily on modern cryptography …

This subreddit is now about Quantum Cryptography

In order to keep up with quantum leaps in a technology which is about to leave the lab at the rate of graphene, a change in phase is necessary and we will need to align with the virtual sea of …

It is possible to avoid square root step of this paper by chosing a different curve type?

The paper works with elliptic curves. But what about using curves in the form of y=x^(6)+Ax^(2)+B^2 or y=x^(2)+Ax+B? Of course in such cases the square root computation would no longer be needed but would it be usefull? My underlying problem …

Breaking Enigma with Index of Coincidence using a Commodore 64

How Close Are We to Adopting Post-Quantum TLS Encryption?

Does anyone how progress for adopting Post-Quantum TLS Encryption is going? Can anyone cite roadmaps for pushing this to production? Please let me know. Thanks!

I digitally reconstructed the rare SG 41 cipher machine as a fully interactive 3D preservation project

For the last decade I’ve been working on *Virtual Colossus*, a long‑running project to digitally preserve early computing and cryptographic machines by rebuilding them as interactive 3D simulations. My newest reconstruction is the SG‑41 — a late‑WWII cipher machine that …

Reviewing my chunked AES-256-GCM streaming format, any issues?

I'm implementing streaming file uploads for an encrypted, self-destructing file sharing service (https://phntm.sh, open source). Currently I buffer entire files in memory, which crashes on large files. I'm switching to chunked AES-256-GCM. Would appreciate a security review of the wire …

Getting young kids interested in cryptography

Hi, I'm thinking of introducing cryptography to my nieces and nephews who range between 10-13 years old. Any suggestions for published materials to get them started and interested?

Safeguarding cryptocurrency by disclosing quantum vulnerabilities responsibly - from Google

Is it possible to abuse elliptic curve pairings as a kind of Diffie Hellman Oracle?

I have a the following equation: e(G,a×G) which is of course is equivalent to e(G,G)^(a) but where a is an unknown discrete logarithm. Now as an attacker, I need to compute e(G,G)^(a×a). Is there a way to abuse pairing to …