DES

[Perry E. Metzger]

wonderer says:
> I don't think it takes the cube of it. There are 56 bits in
> one key, and 112 bits in two keys, so there could not be
> an entropy of more than 112 bits to triple DES. It is no
> more cryptographically secure than double DES because it
> uses 2 keys.

In spite of the "standard" most people do triple DES with three keys.
With the two key system, it would take T^2+T time to do the
calculation, where T is the time to crack single DES on your machine.

Perry