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Re: [Cfrg] Encrypt in place guidance

"Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu> Wed, 01 April 2020 16:14 UTC

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From: "Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu>
To: Leo Perrin <leo.perrin@inria.fr>
CC: "noloader@gmail.com" <noloader@gmail.com>, cfrg <cfrg@irtf.org>
Thread-Topic: [Cfrg] Encrypt in place guidance
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Date: Wed, 01 Apr 2020 16:14:44 +0000
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Subject: Re: [Cfrg] Encrypt in place guidance
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The clue may lie in the specifics of their use case(s) and the corresponding threat models. 

Regards,
Uri

Sent from my iPhone

> On Apr 1, 2020, at 12:11, Leo Perrin <leo.perrin@inria.fr> wrote:
> 
> 
>> 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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