r/crypto is a subreddit with 347k 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
: "Quantum Computers Are Not a Threat to 128-bit Symmetric Keys"
11 posts
#2
Advice Requests
: "Introducing constant-time support for LLVM to protect cryptographic code"
8 posts
#3
Ideas
: "Google and Cloudflare testing Merkel Tree Certificates instead of normal signatures for TLS"
7 posts
#4
Solution Requests
: "WebCrypto PDKDF2+AES-GCM sufficient for secure notes app."
6 posts
#5
Pain & Anger
: "How "Strengthening Crypto" Broke Authentication: FreshRSS and bcrypt's 72-Byte Limit"
1 post
#6
Self-Promotion
: "I built a commitment scheme web app using HMAC-SHA256 with Bitcoin timestamps via OpenTimestamps — open source, MIT licensed"
1 post
Popular Topics in r/crypto
#1
Cryptography
: "A Cryptography Engineer’s Perspective on Quantum Computing Timelines"
29 posts
#2
Encryption
: "Is lattice cryptography actually quantum resistant, or just not yet understood?"
17 posts
#3
Looking For
15 posts
#4
Crypto
: "Cryptographic Right Answers - PQ / updated"
14 posts
#5
Security
: "Security Notions Zoo"
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
: "Exploiting ML-DSA bugs"
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
: "The ePrint:2026/1591 Quantum Algorithm Does Not Solve DCP"
3 posts
#2
April Fools
: "This subreddit is now about Quantum Cryptography"
1 post
#3
Video
: "Why Quantum Cryptanalysis is Bollocks - Peter Gutmann @ Kawaiicon NZ 2025"
1 post
#4
Meta
: "Leiden Declaration on Artificial Intelligence and Mathematics"
1 post
Member Growth in r/crypto
Yearly
+16k members(4.8%)
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This page gives a focused view of r/crypto, including current member size, discussion patterns, product reviews, and related communities to explore.
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Last updated: August 21, 2026