How are spoof decryptions prevented?

[Tom.A.Parker@icl.com]

This may seem unduly simple minded, but in a situation where enforcement to
provide clear text is imposed upon me, how would the LEA know that I did the
decryption truly, rather than substitute some censored alternative?
Presumably they would wish to see me going through the decryption process
itself, or have some other contextual evidence that would assure them - not
always either practical or foolproof.

Or is this a reason (not the only one, clearly!) why there is the option to
get the decryption key itself?


Tom Parker.