On Thu, 31 May 2001 02:14:53 -0500 "Mathew Ryden" <[EMAIL PROTECTED]>
writes:
> Are we talking about PGP or UC2 here? If pgp, you either have a very
> slow
> computer or I'm shocked at norton for having such an unoptomized
> algorithm.
I was talking about UC2 which uses MD5 hash.
>
> > But is Triple-DES better at encrypting useing SHA1 hash than the
> current
> > CAST algorithm?
>
> No. Assuming Triple-DES is at 112 bits and CAST is at 128, CAST is
> better.
> Especially if you assume that the NSA is still years ahead of the
> non-gov't
> crypto world - they probably have made breaking triple-DES trivial
> (DES is
> already trivial).
Hmm, yes I can see how more bits makes it harder to figure out the
encryption key.
>
> > I ask because Triple-DES does this neat thing where it Encrypts
> with
> > Rand1, Decrypts with Rand2 and Encrypts again with Rand1, makeing
> it
> > totaly freaking impossible to break the encryption. I think it is
> a VERY
> > strong encryption method.
>
> it's fairly strong for documents you don't mind being readable quite
> soon. a
> triple-des encrypted file is still only as secure as the key that
> encrypts
> it - in this case the key is Rand1 . Rand2. Assuming that they are
> both 56
> bit keys (as are all DES keys if memory serves) then Triple-DES gives
> you
> 112 bits of security (becuase you reuse a key it doesn't make the
> security
> any stronger on key attacks).
Well I don't know how many bits Rand1 and Rand2 are, but I do know that
they are generated by MD5 based on the password and the archive being
encrypted.
> Hash is, by defination, the same for any file. Encrypting and
> decrypting
> both occur in linear time, correct.
>
> -Mathew
Yes, linear, one right after the other, no weird temporal mechanics
required. :)
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