Henrick Hellström

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72 Answers

newest activity votes
2
Is a small size block cipher usable?
4h ago
2
Security of authenticated encryption modes gcm & ccm
jun 16 at 0:19
3
When using HMAC, does key encoding matter?
jun 10 at 7:19
1
Is entropy affected by time?
jun 4 at 7:46
6
The exact difference between a permutation and a substitution
may 30 at 12:55
7
Why is verification using DSA slower than verification with RSA?
may 27 at 15:51
1
Key sizes for discrete logarithm based methods
may 27 at 7:42
0
Proper Way to Encrypt Data with Two Keys?
may 24 at 8:32
13
Is Wikipedia's table about SHA-2 collisions correct?
may 20 at 22:31
1
Generate fixed length cipher text from arbitrary length plaintext
may 16 at 12:50
2
Is there a way to do fair exchange between two parties who don't trust each other?
may 13 at 10:41
3
Does knowledge of original file size provide a cryptographic weakness?
may 9 at 23:24
2
What does $(\mathbb{Z}_n^*)^2$ mean?
may 7 at 21:45
1
how much is secure to encrypt a password using itself (as encryption key) for storing it on a unsecure media?
may 5 at 11:25
2
Implementing secret reconstruction in Shamir's Secret Sharing
may 5 at 9:03
1
Is AES really used for Top Secret stuff?
may 4 at 10:53
5
encrypt message with one digest 0-9 instead of 01-26
may 3 at 8:52
1
Knowing a valid salted hash for an unknown secret, is it possible to compute another valid hash?
may 2 at 2:37
3
What does the expression $1^n$ mean as a function argument?
mar 28 at 9:40
5
Using the same secret key for encryption and authentication in a Encrypt-then-MAC scheme
apr 23 at 10:26
4
Is it possible to work out the hash algorithm from a list of known message-hash pairs?
apr 22 at 20:45
2
DSA signatures with related k and unknown payloads
apr 4 at 21:08
4
Attack on DSA with signatures made with k, k+1, k+2
apr 4 at 19:44
5
What's the difference between Trapdoor Functions and Encryption Functions?
mar 31 at 22:03
4
Potential vulnerability in DH key selection - am I understanding this right?
mar 27 at 11:31
4
What is the difference between a hash and a permutation?
mar 22 at 13:00
1
Does Linear Cramer-Shoup have pseudo-random ciphertexts?
mar 17 at 10:14
3
How difficult is it to check if a group element is in a sub group?
mar 8 at 14:16
1
Timing attack on modular exponentiation
mar 2 at 2:27
3
How to solve the reverse of an equation that uses MOD?
mar 1 at 17:36
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