[ James, are we in for the longest not-totally-off-topic thread yet? ]

On the problem of distributing a new hex image: with a few checks &
procedures you could distrubute the XOR of the old and the new image.
Cryptographically this is (almost?) equal to the 'one time pad', the
strongest possible cypher. Of course this requires that the loader can read
the old content....

Wouter

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