On 01/22/2010 11:53 AM, Wan-Teh Chang wrote: > 2010/1/22 Robert Relyea <rrel...@redhat.com>: > >> On 01/22/2010 06:37 AM, manish wrote: >> >> i wanted to know why not we use 4 DES , or 5 DES ,.....why onle triple >> DES, >> is there a problem.... >> >> >> For NSS, the answer is simple: >> >> There is no standard for 4 DES or 5 DES, only des and 3 DES (which a special >> form of 3 DES that allows for a '2 DES' strength). >> > Also, 2 DES is vulnerable to the meet-in-the-middle attack: > http://en.wikipedia.org/wiki/Meet-in-the-middle_attack > Do you mean 'naive' 2 DES? real 2 des is:
C = Ek1(Dk2(Ek1(P))) bob > Wan-Teh >
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