User alpominth - Cryptography Stack Exchange

alpominth

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Curious

Mar 19
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2d ago
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2d ago

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hash

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7

Posts

64

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keys

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4

Posts

36

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pseudo-random-function

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2

Posts

18

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ctr

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2

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18

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collision-resistance

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2

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18

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encryption

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18

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All Questions Answers

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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

1

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

Mar 20

1

Why hashing a seed to generate a key and using chaining to get the rest of key matterial is not secure?

Mar 2

0

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?

Mar 22

0

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?

Mar 26

0

Once a secure hash function built up a (fast) internal hash table, can data to be hashed be different from the data inserted when doing the lookups?

Mar 12