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Re: [saag] AD review of draft-iab-crypto-alg-agility-06

"Salz, Rich" <rsalz@akamai.com> Mon, 24 August 2015 21:32 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: "saag@ietf.org" <saag@ietf.org>
Thread-Topic: [saag] AD review of draft-iab-crypto-alg-agility-06
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Date: Mon, 24 Aug 2015 21:32:38 +0000
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Subject: Re: [saag] AD review of draft-iab-crypto-alg-agility-06
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> With *legacy* protocols, when negotiating unauthenticated opportunistic
> encryption, it is important to not exclude recently obsoleted algorithms that
> are still needed for interoperability lest failing to offer them cause
> communications failure or needless use of cleartext.

And here, I think, is the rub.

SMTP is a legacy protocol.  Is opportunistically-encrypted SMTP a legacy protocol?  How long has it been in common use?  How old is the crypto that these deployed systems have access to?

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