Re: [TLS] Kathleen Moriarty's Yes on draft-ietf-tls-cached-info-20: (with COMMENT)

[Stephen Farrell <[e-mail]>]

On 17/12/15 14:58, Kathleen Moriarty wrote:
> Kathleen Moriarty has entered the following ballot position for
> draft-ietf-tls-cached-info-20: Yes
> 
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut this
> introductory paragraph, however.)
> 
> 
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
> 
> 
> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-tls-cached-info/
> 
> 
> 
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
> 
> Just a quick comment, sorry for asking this late and I won't hold up on
> it either, just want to raise the question without quite enough time to
> research it all.
> 
> I see the SHA-256 truncation is just 32 bits.  In other applications,
> about half is what is typically recommended.  I know you are trying to
> cut on space, but will problems arise from this shorter value?

Nah, I think this one's ok. IIUC, the result of a collision is
just a handshake fail, and then presumably recovery when they
ditch the cached stuff. Section 5 describes this.

S.


> 
>