If the encryption is halfway decent, a new IV/nonce will be chosen for
each new revision, and you can't tell that two ciphertexts share a
common prefix without fully decrypting them.
--
Florian Weimer <fweimer@bfk.de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstraße 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99
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