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alpominth
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4 votes
3 answers
1k views

If I encrypt a plaintext with different keys for each block, will I have the same security as a one-time pad?

3 votes
3 answers
1k views

If I hash different seeds with same size of hash output and XOR on plaintext, is it secure as One-time pad?

3 votes
1 answer
261 views

What is the post-quantum security of encryptions schemes based on transpositions?

2 votes
1 answer
620 views

Is there a simple formula to calculate how many inputs generate same outputs in cryptographic hash functions, being the input larger than the input?

2 votes
1 answer
87 views

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?

1 vote
0 answers
183 views

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

1 vote
0 answers
71 views

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

1 vote
1 answer
176 views

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

1 vote
1 answer
43 views

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

1 vote
1 answer
101 views

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

1 vote
2 answers
285 views

How changing a single byte/word in a substitution box affects the inverse result?

1 vote
2 answers
779 views

Are the null bytes produced by a True Random Number Generator a security issue when using it as a source of entropy for keys in One-time pad?

1 vote
1 answer
69 views

Is KangarooTwelve hash function suitable for generating very large key material as Shake-256 is?

1 vote
1 answer
186 views

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

0 votes
1 answer
64 views

Is there a way to defeat statistical information leak in Vigenère cipher when the ciphertext is reasonably larger than the key size?

0 votes
0 answers
30 views

In Vigenère, if I encrypt a plaintext with a block cipher before applying the key, will it be possible to recover the key if it repeats?

0 votes
0 answers
39 views

What is the security of XTS block cipher mode of operation if the key is much larger than the block size?

0 votes
1 answer
71 views

May I use the same One-time pad key two times if I encrypt it with a block cipher using two different block cipher keys?

0 votes
1 answer
77 views

If encrypting with a hash function in counter mode, will the security of this scheme be at most minimal{input,output}?

0 votes
0 answers
73 views

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?

0 votes
1 answer
177 views

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?

0 votes
0 answers
22 views

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?

0 votes
1 answer
80 views

Is there a way to make a pseudorandom function to generate decimal numbers in a specified range and not only producing big ones?