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Re: [Cfrg] Encrypt in place guidance

Leo Perrin <leo.perrin@inria.fr> Wed, 01 April 2020 16:10 UTC

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Date: Wed, 01 Apr 2020 18:10:42 +0200
From: Leo Perrin <leo.perrin@inria.fr>
To: noloader@gmail.com
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Subject: Re: [Cfrg] Encrypt in place guidance
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> The ISO eventually adopted Simon and Speck in other standards,
> however. ISO/29167-21 (for Simon) and ISO/29167-22 (for Speck). The
> 29167 ISO has something to do with RFID.

In that standard (29167), SIMON and SPECK are in good company with... the "XOR encryption" (29167-15), i.e. the XOR of a fixed string. Being included in that standard is then obviously *not* a sign of trustworthiness. 

To be fair, it is not a sign of untrustworthiness either. In fact, 29167 seems to be intended to contain everything as good algorithms can also be found in it: PRESENT is 29167-11, Grain is 29167-13, and the AES is 29167-14. Why did they standardize "XOR encryption"? Why do so after standardizing the AES? I don't have the slightest clue.


/Léo

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