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4 votes
2 answers
27k views
How to find the keyword of the Playfair cipher, given the plaintext and the ciphertext?
2 votes
1 answer
84 views
A query regarding SHA256 output hash structure vs input entropy?
1 vote
1 answer
61 views
Public-Key Encryption with Privilege Access: is it possible?
0 votes
1 answer
33 views
Some misunderstanding on the Security Proof with Oracle
1 vote
1 answer
238 views
What is the current security level of an algorithm?
2 votes
1 answer
125 views
Probability of choosing a base successfully in Pollard p-1 factorization method
2 votes
2 answers
115 views
How to decode Playfair when only a small part of key is available?
1 vote
1 answer
57 views
How would having multiple independently encrypted versions of the same plaintext impact confidentiality?
2 votes
1 answer
79 views
Katz/Lindell 2.4 - Generalizing from 2 messages to any message space?
1 vote
2 answers
2k views
Prove that the affine cipher over Z26 has perfect secrecy if every key is used with equal probability of 1/312
2 votes
1 answer
66 views
Calculating statistical distance for simple addition cipher?
3 votes
0 answers
40 views
Why is WalnutDSA specified for COSE?
13 votes
2 answers
5k views
Why don't we use Blowfish if it hasn't been cracked?
1 vote
0 answers
36 views
How to Prove matrix $m \times m$ is invertible is equivalent to be $LI$ over $\mathbb{Z_{2}}$?
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