Re: [TLS] TLS1.3

["Lewis, Nick" <[e-mail]>]

>RFC 5116 defines a uniform interface for cipher modes that use the term AEAD
>and RFC 5297 is an AEAD scheme that takes a double-wide key (half for cipher, half for mac)
>and fits into the uniform interface (with the assigned numbers 15, 16, and 17).
>Your concern is misplaced; we're already doing this.

>Dan.

Thanks - seeing another example of concatenated keys helps to allay my fears (though ironically RFC5297 seems to specify a variant of CCM that may be secure with the same key for crypt and mac)
Nick


The details of this company are as follows:
G4S Technology Limited, Registered Office: Challenge House, International Drive, Tewkesbury, Gloucestershire GL20 8UQ, Registered in England No. 2382338.

This communication may contain information which is confidential, personal and/or privileged.

It is for the exclusive use of the intended recipient(s).
If you are not the intended recipient(s), please note that any distribution, forwarding, copying or use of this communication or the information in it is strictly prohibited.

Any personal views expressed in this e-mail are those of the individual sender and the company does not endorse or accept responsibility for them.

Prior to taking any action based upon this e-mail message, you should seek appropriate confirmation of its authenticity.

This e-mail has been scanned for all viruses by MessageLabs.