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Dec
15
comment rotational cryptanalysis on modulo multiplication?
Also, please mark the answer as valid if you consider it so.
Dec
15
comment rotational cryptanalysis on modulo multiplication?
I never tried a rotational attack with distinct rotation distances, so I do not know how it could work..
Dec
11
answered rotational cryptanalysis on modulo multiplication?
Nov
19
comment Do data-dependent rotations have any advantage over fixed rotations?
I also immediately recalled attacks on DynamicSHA and its relatives. I would also mention that the designers usually want to control diffusion, i.e. to ensure the avalanche effect. Data-dependent rotations make the diffusion probabilistic, thus troubling the upper bounds on differential and linear properties.
Oct
29
comment Encryption algorithm designed to be easy to decrypt by machine but impractical to decrypt by hand
What do you mean by variable keys? How about RC4?
Oct
25
awarded  Yearling
Oct
25
comment AES-GCM Disadvantage
I have tried to add the performance issue.
Oct
25
revised AES-GCM Disadvantage
added 154 characters in body
Oct
24
answered Is AES's parity key-dependent?
Oct
24
revised AES-GCM Disadvantage
added 113 characters in body
Oct
24
comment AES-GCM Disadvantage
You're right, I will correct.
Oct
22
answered Proof that counter mode of operation and CBC mode are CPA secure when pseudorandom permutations?
Oct
20
answered Is it just as difficult to find a desired output in a hash digest, for MSB vs LSB?
Oct
15
comment AES: Guess Password using the unencrypted text?
What is the software you're using and the encryption mode exactly (CBC? CTR?).
Oct
11
comment Weak key schedule IDEA
This is my educated guess based on the evolution of block ciphers and contemporary theory. Serious block cipher research appeared later (for example, Daemen's PhD thesis from 1995).
Oct
9
answered Weak key schedule IDEA
Sep
30
awarded  Explainer
Sep
12
answered Regarding Key Strength with DES and Blowfish
Sep
11
comment AES-GCM Disadvantage
I would say that "authentication key" is a bit confusing. Could be better "Subsequent forgeries can be made almost instantaneously so that authenticity is no longer provided."
Sep
11
comment Are there cryptographic hash functions with homomorphic properties?
@poncho, yes, distributive properties like you describe will likely to reduce the collision security level (in bits) by the factor of 2 or so.