1,262 reputation
417
bio website
location Saarbrücken, Germany
age 26
visits member for 2 years, 6 months
seen 14 mins ago

Jul
15
comment Primality testing (deterministic vs. non-deterministic)
Compared to probabilistic algorithms AKS is horribly inefficient.
Jul
8
comment Difference between actual attacks and theoretical attacks on SHA cryptographic series
Mainly because "attacks only get better" A theoretical attack means, that somebody has found a way to attack the system faster than expected. This often leads to a series of better and better attacks until we have something that can actually be used against the system in practice.
Jul
5
answered Lamport-Diffie + Security Proof
Jul
1
reviewed Leave Open Why is “mod(n)” so central to most aspects of cryptography?
Jul
1
reviewed No Action Needed RSA by hand - did I do something wrong? (c = m on encryption)
Jul
1
reviewed No Action Needed How much stronger is RSA-2048 compared to RSA-1024?
Jun
28
reviewed No Action Needed Offline app authentication - embedding hashed password inside an encrypted file
Jun
28
comment P = NP and current cryptographic systems
As Henrick Hellström said, basically everything, where the security stems from information theoretic arguments would remain secure. Everything based on computational hardness should basically fail. The main problem is, that most cryptographic primitives cannot be implemented in a usable way without assuming computational hardness. (Think of symmetric encryption, sure OTP still works, but it isn't very usable in practice.)
Jun
27
answered P = NP and current cryptographic systems
Jun
24
reviewed Satisfactory Injecting salt into PyCrypto KDF - useful?
Jun
24
reviewed No Action Needed Map Bytes to Number
Jun
24
reviewed Reviewed Why are elliptic curves better than cyclic groups?
Jun
24
reviewed Close Is it possible to anonymize web traffic so that the IP Address cannot be determined while still being able to determine distinct IPs?
Jun
24
awarded  Custodian
Jun
24
reviewed Excellent Is Base64(SHA1(GUID)) still unique like the original GUID?
Jun
24
comment Signature with appendix
Where did you see this terminology used?
Jun
14
comment Is it possible to cryptographically prove when was the last time a ciphertext was decrypted/encrypted?
That's really not the point. Even if the service provider does not know the key, they have no way to prove it.
Jun
14
comment Is it possible to cryptographically prove when was the last time a ciphertext was decrypted/encrypted?
@Michael That should be impossible. Basically you are trying to prove that you do NOT know something. Whatever protocol you use for that, you can always just pretend to not know.
Jun
10
comment Is it possible to anonymize web traffic so that the IP Address cannot be determined while still being able to determine distinct IPs?
Your proposed solution for 2. breaks 1. An attacker would simply run the IP-address through the function and invoke the "same_parent" functionality on the resulting string and an entry from the log...
Jun
9
comment What kind of cryptography should i use?
Well, if you do not trust S anyway, then encrypting in any way that enables S to decrypt seems a bit pointless.