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Grant Sewell wrote: > I was under the impression that "effective encryption" is only ever a > temporary thing, so to maintain data integrity the system would have to > use a new (set of) encryption algorith(s) regularly. > That doesn't seem to be the way it goes. You may need to change keys, but that is more to limit the amount of cyphertext available for the enemy to make deductions about than because what is encrypted becomes easier with the passage of time. Volume, not time, is what may provide a crib. Modern systems produce session keys, so only a limited amount of material goes out under that key without the users being involved in changing their keys. Using a large number of universes to do massively parallel decryption, or weakly godlike AIs or other major Changes in the Rules might change this of course... -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html