Re: Why is 3DES favoured over AES?
- From: Francois Grieu <fgrieu@xxxxxxxxx>
- Date: Wed, 18 May 2011 10:57:10 +0200
On 18/05/2011 10:10, Mok-Kong Shen wrote:
3DES seems to be favoured over AES in certain practical use today, e.g.
in VISA. Why is this so?
1) Inertia rules the universe.
2) The above rule applies especially when there is no visible benefit to change, when change is costly, or when in the banking domain; all of this apply in the case of VISA. In particular, I know no foreseeable weakness attributable to 3DES in the context of banking, even when restricted to 112-bit keys.
3) Implementation of 3DES with countermeasures against side-channel attacks is well studied, and available in hardware (thus faster than AES in software) on virtually all Smart Card microprocessors, including those costing a fraction of an euro used in bank Smart Cards, and have common-criteria evaluation to EAL4+ or better. This is not yet as common/cheap with AES.
Francois Grieu
.
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