r/cryptography is a subreddit with 93k members. The community frequently discusses cryptography, encryption, algorithms, security, and coding, and they frequently recommend/review textbook and encryption software.
For people interested in the mathematical and theoretical side of modern cryptography.
Popular Topics in r/cryptography
#1
Cryptography
180 posts
#2
Encryption
100 posts
#3
Algorithms
30 posts
#4
Security
25 posts
#5
Coding
21 posts
#6
Rsa
13 posts
#7
Quantum
13 posts
#8
Protocol
10 posts
#9
Hashing
10 posts
#10
Algorithm
9 posts
Products Discussed in r/cryptography
Textbook
5 reviews
#1
Paar and Pelzl
4.0★ from 1 review
#2
NTRU
3.0★ from 1 review
#3
Springer
4.0★ from 1 review
Encryption Software
4 reviews
#1
Age
4.0★ from 1 review
#2
Picocrypt
4.0★ from 1 review
#3
gocryptfs
4.0★ from 1 review
Member Growth in r/cryptography
Yearly
+12k members(15.4%)
About
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This page gives a focused view of r/cryptography, including current member size, discussion patterns, product reviews, and related communities to explore.
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Last updated: May 31, 2026