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Programmer


Aug
22
awarded  Yearling
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awarded  Popular Question
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awarded  Fanatic
Sep
27
awarded  Custodian
Sep
27
reviewed Excellent Will our app be FIPS 140-2 compliant if we use our own AES algorithm implementation?
Sep
1
awarded  Enthusiast
Aug
28
awarded  Critic
Aug
27
awarded  Custodian
Aug
27
reviewed Edit suggested edit on Why no swapping block in the last round of DES?
Aug
27
revised Why no swapping block in the last round of DES?
Added the link to the document, did some typo corrections and some reformatting.
Aug
27
answered Why no swapping block in the last round of DES?
Aug
25
awarded  Citizen Patrol
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18
awarded  Suffrage
Aug
17
accepted AES key expansion: 256bit key
Aug
14
comment Why does DES use exactly 16 rounds?
yes, but with 16 rounds you have to use brute force, since other type of attacks aren't faster than brute force at 16 rounds, while they are faster with less rounds. Regarding the "possibility to break 16 rounds", see wikipedia - DES Challenges; in 1992 it took 22 hours and 15 minutes to break DES.
Aug
13
answered Why does DES use exactly 16 rounds?
Aug
9
revised why DES encryption uses different modes like ECB,OFB?
added 27 characters in body
Aug
8
answered why DES encryption uses different modes like ECB,OFB?
Aug
6
awarded  Scholar
Aug
5
comment AES key expansion: 256bit key
I've read the Rijndael specifications found here: link and here: link, some cryptoanalysis link and other smaller docs (mainly found through scholar.google.com): they mention the application of the extra S-box if Nk>6 (keysize bigger than 192), but none of them says why. So I got curious; probably there is some document around that explains this, but I didn't find it.