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List:       suse-security
Subject:    Re: [suse-security] What's the length of ssh keys?
From:       Steve <steve () videogroup ! com>
Date:       2002-07-02 12:53:16
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On Monday 01 July 2002 12:23 pm,  you wrote:
>A friend of mine told me that 1024bit keys were broken, and he advised me to
>use 4096bit keys...
>I think he is confusing ssl with ssh.
>Do you have similar information on this?
>
>Praise

To give you an idea.

June 1997, 56 bit DES key was cracked.

August 1999, 512-bit RSA key was cracked. (At the time, 95% of the keys used 
in e-commerce were 512 bits long.)

Recommended public-key key lengths (in bits) [Source: Bruce Schneider, 
Applied Cryptography]

Year    Individual   Corporation     Government
1995      768                1280              1536
2000     1024              1280              1536
2005     1280              1536              2048
2010     1280              1536              2048
2015     1536               2048              2048

Summary of Recent Cracking Efforts
Algorithm    Key Size      Cracked on       Duration
RSA             425                1994                240 days 
RC4             40                   8-95                 8.5 days
RC5             40                   1-97                 3.5 hours
RC5             42                   2-97                 313 hours
DES             56                  6-97                 140 days
RC5             56                  10-97                265 days
DES             56                  2-98                 39 days


-- 
 
Steve Szmidt
V.P. Information Technology
Video Group Distributors, Inc.

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