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 Wan-Teh -- dev-tech-crypto mailing list dev-tech-crypto@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-tech-crypto
