[Sea-sec] Comment re: key sizes in Algorithm document

Weiss, Howard Howard.Weiss at parsons.com
Thu Jul 5 17:36:33 UTC 2018

We currently have two documents in CESG polling for Agency Review.

On the Algorithms document, we have increased the minimum key sizes.  However we have a comment from Mario Merri (ESA):

"The main change is the strenghen of the authenticaltion keys. These have been increased, thus making implementations that followed the previous CCSDS recommentation not-compliant. Why has the document update not been made in a backward-compatible manner, still strongly recommending the new key lengths?"

Peter Shames suggested that we make the larger key size a "shall" but allow the smaller key sizes as "may" with a note strongly discouraging the smaller key sizes. This would satisfy Mario's backward compatibility issue.

Any comments?  Any disagreements?  Any other suggestions?




Howard Weiss, CISSP

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