"Concryption" Prior Art

[Bill Stewart]

>>However the Con-cryption patent covers first compressing, then
>>encrypting.
>
>Isn't that how PGP does its thing (first compress the data and then feed it
>into the Encryption Stage)? PGP is prior art in-and-of-itself.

Peter Wayner posted that the "new" thing about the way they do it is
that it saves time by combining the steps.  But I think I've seen
approximately the same done with arithmetic-coding compression?
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