alpominth

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Questions

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2

When the input size in a PRF is larger than the output and many inputs will generate the same output, but why AES-256 in CTR mode is considered safe?

Mar 3

1

Why do the hash functions tested by SMhasher appear to be exceptionally fast?

Mar 10

1

How to estimate the collision resistance of a hash function if a secondary key is used (keyed hash function)?

Mar 17

1

Does an increase of message size increase the number of guesses to find a collision?

Mar 17

1

Is it safe or reasonable to use the key parameter in a cryptographic hash function as a counter?

Mar 18

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+8

If I encrypt two plaintexts with different keys, XOR the ciphertexts and send to an adversary, what can he/she do with what I sent?

+8

Hashing a seed full of entropy with a cryptographic hash function and emiting a key with the same size as input: can a collision attack occurs?

+10

How to estimate the collision resistance of a hash function if a secondary key is used (keyed hash function)?

+10

In CTR block cipher mode of operation, can I reuse the nonce with another key for encrypting another plaintext if using different counters?

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