[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: More on Netscape
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.
Highday, 25 Wedmath S.R. 1995, 22:18