Re: More on Netscape
It says that the commerce server supports (among others) DES and DES3 (same as 3DES?). They list the key sizes as 64 and 192 bits respectively. My question is, isn't DES 56 bits? (with an 8 bit salt that would be 64 I guess), but isn't DES3 112 bits, not 192?
DES keys are specified as 64 bits, of which 8 bits provide odd parity. The 192 bits would specify three independent keys (not triple DES)
Various people said:
It says that the commerce server supports (among others) DES and DES3 (same as 3DES?). They list the key sizes as 64 and 192 bits respectively. My question is, isn't DES 56 bits? (with an 8 bit salt that would be 64 I guess), but isn't DES3 112 bits, not 192?
DES keys are specified as 64 bits, of which 8 bits provide odd parity. The 192 bits would specify three independent keys (not triple DES)
Real-world DES implementations ignore those 8 "parity" bits. DES uses 56 bits of key for encryption, and calling it a 64 bit key is misleading. Triple DES (3DES) is an overloaded term. It's used in 2- and 3-key versions, for 112 and 168 bits of protection respectively. Jim Gillogly Highday, 25 Wedmath S.R. 1995, 22:18
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