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Sep
28
comment How to attack a fixed LCG with partial output?
@nightcracker, in that case, it sounds like your question is not about cryptography per se, so I don't think it is on-topic here. The cryptographic aspect of the question has been answered....
Sep
28
revised How to attack a fixed LCG with partial output?
added 1224 characters in body
Sep
28
answered How to attack a fixed LCG with partial output?
Sep
27
awarded  Nice Answer
Sep
27
awarded  Nice Answer
Sep
27
answered What are the possible cryptographic implications of Zhang's proof of the Twin Prime Conjecture?
Sep
27
comment How much does a successful Distinguishing Attack “break” the attacked stream cipher?
It sounds like your real question is: "Does a distinguishing attack count as a complete break, from a practical perspective?" If so, you might want to re-write your question from this much more general perspective (whether it's a linear distinguishing attack or some other distinguishing attack is probably of limited relevance).
Sep
27
comment How does Dissent protect against Sybil Attacks?
Have you read the research paper? That would be the best place to start, for this sort of question. (Often presentations don't include all of the detail; a lot of details are left to the paper, so you really need to read the paper if you want to answer detailed questions like this.)
Sep
25
comment Is this a structural weakness of Feistel networks?
pg1989, Ahh, now I see: you are uncertain about the definition of diffusion. The definition of diffusion is that each bit of the input affects all bits of the output. For instance, if you flip one bit in the input to the block cipher, then about half of the bits of the output of the block cipher should change. Notice that this doesn't impose any restrictions on what happens internally, inside the block cipher; it only has to do with how the inputs ultimately affect the final outputs of the cipher. See the strict avalance criterion.
Sep
25
comment How broken is a xor of two LCGs?
Many thanks, @fgrieu! You're right, that wasn't right. It should have been "top 40 bits of $x_0$", not "bottom 20 bits of $x_0$". Fixed. Thank you for spotting that!
Sep
25
revised How broken is a xor of two LCGs?
fix error. thanks, fgrieu
Sep
25
reviewed Excellent Will our app be FIPS 140-2 compliant if we use our own AES algorithm implementation?
Sep
25
reviewed Satisfactory How relevant are hardware implementations of crypto algorithms?
Sep
25
reviewed Satisfactory Relationship between Elliptic Curve Discrete Log, Integer Discrete Log, and Integer Factorization
Sep
25
reviewed Needs Improvement How to supply the GCM authentication tag to the OpenSSL command line tools?
Sep
25
reviewed Excellent Does there exist a two-pass AKE protocol that is secure in eCK model and also has PFS?
Sep
25
reviewed Satisfactory What to watch for with openssl generating weak keys? (low entropy)
Sep
25
reviewed Excellent What criteria make the theta step of Keccak's round function reversible?
Sep
25
reviewed Satisfactory Does the GCM authentication tag need to be protected?
Sep
25
reviewed Satisfactory Is it theoretically possible to construct a string that contain its own hash value?