r/crypto is a subreddit with 346k members. The most common kinds of discussions are news and advice requests, and the community frequently discusses cryptography, encryption, looking for, crypto, and security, 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.S. officials urge Americans to use encrypted apps amid unprecedented cyberattack"
12 posts
#2
Advice Requests
: "Reviewing the Cryptography Used by Signal"
6 posts
#3
Pain & Anger
: "Hell Is Overconfident Developers Writing Encryption Code"
4 posts
#4
Solution Requests
: "NowSecure Uncovers Multiple Security and Privacy Flaws in DeepSeek iOS Mobile App"
3 posts
#5
Ideas
: "Post-Quantum Cryptography Is About The Keys You Don’t Play"
3 posts
Popular Topics in r/crypto
#1
Cryptography
: "A Cryptography Engineer’s Perspective on Quantum Computing Timelines"
27 posts
#2
Encryption
: "Is lattice cryptography actually quantum resistant, or just not yet understood?"
17 posts
#3
Looking For
15 posts
#4
Crypto
14 posts
#5
Security
: "Is lattice cryptography actually quantum resistant, or just not yet understood?"
11 posts
#6
Software
5 posts
#7
Quantum
: "Replacing the QPU with /dev/urandom - a github page demonstrating non-Quantum replication of a QC result"
5 posts
#8
Post Quantum
: "Hybrid Constructions: The Post-Quantum Safety Blanket"
4 posts
#9
Ml Kem
4 posts
#10
Struggling
3 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]"
9 posts
#2
Meta
: "Crypto is not cryptocurrency - Welcome to the cryptography subreddit, for encryption, authentication protocols, and more"
2 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
+17k members(5.2%)
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Last updated: July 24, 2026