Cryptography
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J.D.
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67 Answers

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26
Reason why “XOR” is a linear operation, but ordinary “addition” isn’t?
Dec 28 '13 at 16:40
21
Why is the permutation in AES (and other ciphers) not random or key-dependent?
Apr 12 '16 at 13:05
17
Why does only length prepending improve the security of CBC-MAC
Oct 19 '13 at 10:36
16
How exactly is “true randomness” defined in the realms of cryptography?
Oct 5 '13 at 16:48
10
How to deal with a cipher with addition and XORs combined together?
Jul 1 '16 at 15:58
9
Implement AES-CTR on top of AES-ECB
Mar 11 '17 at 23:21
9
Why do cryptographic hashing and symmetric encryption use different functions?
May 6 '16 at 11:15
9
Why have round constants in hashes?
Jul 10 '15 at 13:41
8
Non-linearity of a boolean function
Oct 18 '13 at 11:41
8
Is this really the correct way to do an IND-CPA test?
Oct 1 '13 at 1:57
7
Why DES s-box non-linear? Why it makes the cracking of the cypher more difficult?
Jul 12 '16 at 11:58
7
Discrete logarithm problem is easy in a cyclic group of order a power of two
Apr 2 '16 at 12:16
7
One-Time Pad Distribution of Keys Between Two Parties
Oct 12 '13 at 1:19
7
Proof that IND$-CPA implies IND-CPA?
Sep 21 '13 at 14:50
6
Why does CBC-MAC need prefix-free inputs to be a good PRF?
Nov 1 '13 at 22:41
6
What is the intuition behind AES or SPN?
Oct 9 '13 at 14:16
6
Why are huge prime numbers important in cryptography?
Oct 7 '13 at 2:37
5
Chance of finding the right key by exhaustively searching on half of the key space
Jul 8 '16 at 19:39
5
We can obtain “absolutely perfect CONFIDENTIALITY” using the one-time pad. Is there such a thing as “absolutely perfect INTEGRITY”?
Jun 26 '16 at 13:21
5
How to prove the security of block ciphers
May 4 '16 at 1:03
5
Help with breaking AES reduced to 2 rounds
Mar 6 '16 at 14:39
5
Theoretical security of bit rotation for encyption
Jan 30 '16 at 4:11
5
How to prove that someone encrypted a specific (large) chunk of data
May 25 '15 at 14:08
5
Impact of distinguishing between random text and cipher text?
Jan 23 '14 at 18:07
5
implication of tweak on bruteforcing a block cipher
Jan 8 '14 at 13:09
5
How do we prove that AES, DES etc. are secure?
Oct 7 '13 at 1:02
4
What is the meaning of Maximum Expected Differential/Linear Probability (MEDP/MELP)?
Mar 2 '17 at 1:11
4
What is the point of differential cryptanalysis when the amount of necessary plaintext is unrealistic?
Jul 1 '16 at 20:35
4
Is this a better involution S-Box for the Anubis cipher?
May 31 '16 at 13:33
4
Does the key schedule function need to be a one-way function?
Dec 26 '13 at 0:58
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