Is there any way to detect that an invalid key ( invalid key value, not
length ) was used in a decryption process ?   I guess I could add a short
string at the beginning of the data before the encryption takes place, and
then check for this string right after decryption.   If the string is there,
decryption was successful.

Maybe the Crypto++ library already includes the machinery to do this type of
checking ?

Thanks a lot,
Walt.

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