how to tell if decryption was successfull?

[Matt Crawford]

On Feb 1, 2005, at 13:29, Andreas wrote:

> I was wondering how can one tell if some data was successfully 
> decrypted. Isn't there an assumption going on about what the cleartext 
> data should be? Text? Image? ZIP file? Ziped jpeg? Another cyphertext? 
> rot-13?

Embedded checksums or hash codes added before encryption.  The types of 
those checks must not interact badly with the encryption.


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