r/crypto is a subreddit with 345k members. The most common kinds of discussions are news and advice requests, and the community frequently discusses cryptography, encryption, security, crypto, and looking for, and they frequently recommend/review text editor.
Cryptography is the art of creating mathematical assurances for who can do what with data, including but not limited to encryption of messages such that only the key-holder can read it. Cryptography lives at an intersection of math and computer science.
This is a technical subreddit covering the theory and practice of modern and *strong* cryptography.
Popular Themes in r/crypto
#1
News
: "U.K. orders Apple to let it spy on users’ encrypted accounts"
25 posts
#2
Advice Requests
: "Lost after PhD in Cryptography"
6 posts
#3
Solution Requests
: "NowSecure Uncovers Multiple Security and Privacy Flaws in DeepSeek iOS Mobile App"
4 posts
#4
Pain & Anger
: "Probable copy-paste error in PSPICE's AES-256 implementation shrinks effective keyspace to 2^32 and leads to a practical crack of proprietary semiconductor model files"
3 posts
#5
Ideas
: "Free ideas I don't have the time/energy to build (most are cryptography-related)"
3 posts
#6
Self-Promotion
: "I am the author of The Joy of Cryptography, which is finally in print today. Ask me anything."
1 post
Popular Topics in r/crypto
#1
Cryptography
: "I am the author of The Joy of Cryptography, which is finally in print today. Ask me anything."
154 posts
#2
Encryption
: "The UK Is Still Trying to Backdoor Encryption for Apple Users"
69 posts
#3
Security
: "Go Cryptography Security Audit"
30 posts
#4
Crypto
: "Ask Your Cryptographer if Context-Committing AEAD Is Right for You"
23 posts
#5
Looking For
15 posts
#6
Key
: "Post-Quantum Cryptography Is About The Keys You Don’t Play"
14 posts
#7
Post Quantum
: "Post-Quantum Cryptography Is About The Keys You Don’t Play"
11 posts
#8
Quantum
: "Impersonating Quantum Secrets over Classical Channels"
11 posts
#9
Fhe
9 posts
#10
Algorithm
: "Exact Coset Sampling for Quantum Lattice Algorithms"
8 posts
Products Discussed in r/crypto
Text Editor
2 reviews
#1
Overleaf
5.0★ from 1 review
#2
LyX
4.0★ from 1 review
Flair Used in r/crypto
#1
Document file
: "All Cops Are Broadcasting: Breaking TETRA After Decades In The Shadows [pdf]"
10 posts
#2
Meta
: "Crypto is not cryptocurrency - Welcome to the cryptography subreddit, for encryption, authentication protocols, and more"
3 posts
#3
pending, new account
: "Lost after PhD in Cryptography"
2 posts
#4
April Fools
: "This subreddit is now about Quantum Cryptography"
1 post
#5
Video
: "Why Quantum Cryptanalysis is Bollocks - Peter Gutmann @ Kawaiicon NZ 2025"
1 post
Member Growth in r/crypto
Yearly
+18k members(5.5%)
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About
GummySearch helps people research Reddit communities by organizing activity, growth, themes, and post-level signals into one place.
This page gives a focused view of r/crypto, including current member size, discussion patterns, product reviews, and related communities to explore.
This data is synced periodically so insights stay current and useful for ongoing research.
Last updated: June 25, 2026