Reputation
563
Top tag
Next privilege 750 Rep.
See votes, expandable usercard
Badges
3 12
Newest
 Caucus
Impact
~18k people reached

  • 0 posts edited
  • 0 helpful flags
  • 21 votes cast
Jul
30
accepted Signature and hash function properties
Jul
30
comment Signature and hash function properties
Thanks very much for this answer.
Jul
28
comment Signature and hash function properties
Thanks but why does Merkle trees need a preimage resistant hash function?
Jul
28
comment Signature and hash function properties
Thanks for youer answer. "Without preimage resistance you would also be unable to build hash trees." Why ? You speak about hash trees in terms of hash functions based on it, or you speak about an other application ?
Jul
28
comment Signature and hash function properties
@Bristol Thank you for your comment. That means that the pre-image resistance is closely linked to collision resistance. But if there are three properties, this means that we could satisfy a subset of them ?
Jul
28
asked Signature and hash function properties
Jul
7
comment Question about keyed hash functions
@YehudaLindell Thanks for the comment. Then, if for symmetric and asymmetric systems there is a key generation algorithm... We can think this is also the case for keyed hash functions or not ?
Jul
5
comment Question about keyed hash functions
@poncho Thank you for your comments. I'm referring to non hmac algorithms. In general, for a signature (or encryption) algorithm, there is a key generation function. That's why I wonder if there is such a generation function for hashing. So, is there such a key generation algorithm for a keyed hash function ?
Jul
5
comment Question about keyed hash functions
Thanks for your comment.
Jul
4
asked Question about keyed hash functions
Jun
23
awarded  Caucus
May
30
awarded  Yearling
May
20
awarded  Popular Question
Jan
6
revised Size of a MAC for a quickly checked message?
deleted 1 character in body
Jan
5
comment Size of a MAC for a quickly checked message?
@yyyyyyy "My point was that you potentially have to defend against attackers who use a lot more computing time than one second" Maybe. Anyway, the date included in the message has to be at most one second earlier than the current time.
Jan
2
comment Size of a MAC for a quickly checked message?
Yes we can assume there is a date in the message. @CodesInChaos To be safe I should use 14 bytes (112 bits), why 16 bytes is sufficient when we have a delay of one second ? Where can we find recommandations for this kind of application ? Thank you
Jan
2
asked Size of a MAC for a quickly checked message?
Dec
1
comment Requirement for the length of a HMAC tag?
Thanks. "as long as it is a short lived message, such as a network packet that will be verified less than a second after it is transmitted". Where can we find this kind of requirements ? NIST ?
Nov
30
comment Requirement for the length of a HMAC tag?
so, for HMAC I can truncate to 96 bits and still have something "currently" secure ?
Nov
30
asked Requirement for the length of a HMAC tag?