56 bits..

hi guyz...
i wanna know y DES algorithm is specifically 56 bits.. only..
i know there is some specific reason but wat i don't know..
while most of the other are are 64 bit block cihers or in multiples..
help me out..
ashtified

Quote:

---

DES works by encrypting groups of 64 message bits, which is the same as 16 hexadecimal numbers. To do the encryption, DES uses "keys" where are also apparently 16 hexadecimal numbers long, or apparently 64 bits long. However, every 8th key bit is ignored in the DES algorithm, so that the effective key size is 56 bits. But, in any case, 64 bits (16 hexadecimal digits) is the round number upon which DES is organized.

---

First hit on google ;)

http://www.aci.net/kalliste/des.htm

Quote:

---

You must spread your AntiPoints around before giving it to ©opy®ight again.

---

:(

- Xierox

FYI:

DES by itself isnt that great. But its been around for awhile, so its been made stronger by 'multiplying' the encryption by 3... Hence, 3DES. Most applications that support encryption support DES. Microsoft do in their servers, and its implemented quite well.

I'll choose 3DES over SHA-1 now :P

thanx ppl for ur help..
well double//word..

Quote:

---

DES by itself isnt that great. But its been around for awhile, so its been made stronger by 'multiplying' the encryption by 3... Hence, 3DES. Most applications that support encryption support DES. Microsoft do in their servers, and its implemented quite well.

---

as of urs information 3DES has been compromised n its not that secure if a person who wants to break it n has enough resources./.
[glowpurple]AES is much better..[/glowpurple]
jus has 1 drawback..
bcoz of its simple mathmatics backgrnd..
1nce exploited will be problamatic