L17 - Hashes Flashcards
1
Q
If the length of a hash is 128 bits, then how many messages does an attacker need to search in order to find 2 that share the same hash
a) 128
b) 2^127
c) 2^128
d) 2^64
A
d) 2^64
2
Q
The one-way hash function is important not only in message authentication, but also in digital signatures
a) True
b) False
A
b) False
One-way function is important for only message authentication but not for digital signatures
3
Q
SHA processes the input one block at a time but each block goes through the same processing
a) True
b) False
A
a) True
This is how SHA works
4
Q
HMAC is secure provided that the embedded hash function has good cryptographic strengths such as one-way and collision resistant
a) True
b) False
A
a) True
