Re: Is 3DES more secure than 384 bit RSA?

From: Anne & Lynn Wheeler (lynn_at_garlic.com)
Date: 02/03/04 

Date: Tue, 03 Feb 2004 14:42:29 GMT

"JG" <jg@hotmail.com> writes:

> Hello, I'm not sure if you can compare 3DES and RSA key lengths as
> they are not the same algorithm.
>
> I am wondering which would be more "secure": 3DES at 112 bits or RSA
> at 384 bits?
>
> I can use either but like the idea that I can distribute RSA Public
> Keys without all the security hassle associated with distributing
> symmetric keys.

try internet draft "Determining Strengths For Public Keys Used For
Exchanging Symmetric Keys":
http://www.ietf.org/internet-drafts/draft-orman-public-key-lengths-07.txt

from above:

System
requirement Symmetric RSA or DH DSA subgroup
for attack key size modulus size size
resistance (bits) (bits) (bits)
(bits)

    70 70 947 129
    80 80 1228 148
    90 90 1553 167
   100 100 1926 186
   150 150 4575 284
   200 200 8719 383
   250 250 14596 482 

-- 
Anne & Lynn Wheeler | http://www.garlic.com/~lynn/ 
Internet trivia 20th anv http://www.garlic.com/~lynn/rfcietff.htm

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