[1261] in bugtraq
Re: Lotus Notes Encryption Methods
daemon@ATHENA.MIT.EDU (Perry E. Metzger)
Tue Mar 14 20:19:27 1995
To: fc@all.net (Dr. Frederick B. Cohen)
Cc: root@wu1.wl.aecl.ca, bugtraq@fc.net
In-Reply-To: Your message of "Tue, 14 Mar 1995 16:18:20 EST."
<9503142118.AA14653@all.net>
Reply-To: perry@imsi.com
Date: Tue, 14 Mar 1995 18:30:33 -0500
From: "Perry E. Metzger" <perry@imsi.com>
Dr. Frederick B. Cohen says:
> > In the tech notes that I have, it would seemt that RC2 uses a 128bit key an
d
> > RC4 uses a 256bit key.
> >
> > Both these keys seem rather small in comparison to something like PGP's
> > 1028bit key.
>
> 128bit key is about 40 digits - NSA approved - breakable by a PC
> in a few hours.
If you can manage to break a 128 bit RC4 key in a few hours on your
machine, then you likely have about a fifty billion way multiprocessor
hanging out on your desk.
Key lengths from different cryptosystems DO NOT map into each
other. Factoring a 128 bit number is fast -- breaking 128 bit IDEA
keys is not computationally feasable.
