1993-10-14 - Re: DES
Header Data
From: “Perry E. Metzger” <pmetzger@lehman.com>
To: cypherpunks@toad.com
Message Hash: b20374bac590b1ff514b0f0015c580dbc6abffe469f3182d3300a53c1547a989
Message ID: <9310141616.AA11778@snark.lehman.com>
Reply To: <Pine.3.07.9310140846.A20680-a100000@hopper>
UTC Datetime: 1993-10-14 16:17:15 UTC
Raw Date: Thu, 14 Oct 93 09:17:15 PDT
Raw message
From: "Perry E. Metzger" <pmetzger@lehman.com>
Date: Thu, 14 Oct 93 09:17:15 PDT
To: cypherpunks@toad.com
Subject: Re: DES
In-Reply-To: <Pine.3.07.9310140846.A20680-a100000@hopper>
Message-ID: <9310141616.AA11778@snark.lehman.com>
MIME-Version: 1.0
Content-Type: text/plain
Jamie Jamison says:
>
> Two questions about DES.
>
> 1) If the current, 56 bit, DES system is so easy to break why don't people
> switch over to a DES system that uses a larger key space, say 128 bits?
> People obviously aren't, so what's the barrier to this?
DES only takes 56 bit keys.
> 2) How much longer would it take to break triple DES versus standard DES
> using one of the key-breaking machines described?
Using brute force, it would take the cube of the time it takes to break
single DES. Whether a more sophisticated techinque is possible is unknown.
Perry
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- 1993-10-14 (Thu, 14 Oct 93 08:56:58 PDT) - DES - Jamie Jamison <jamie@apl.washington.edu>
- 1993-10-14 (Thu, 14 Oct 93 09:17:15 PDT) - Re: DES - “Perry E. Metzger” <pmetzger@lehman.com>
- 1993-10-14 (Thu, 14 Oct 93 16:57:03 PDT) - Re: DES - Matthew J Ghio <mg5n+@andrew.cmu.edu>