Funny design method to hide mail addresses ?

[webmaster () bodegon-colonial com]

Hi there,
In my web project, I am storing mail addresses. These addresses may be used by the system to throw mails to the 
recipients. It is also important to say that these mail addresses have expiration time.

But the critical point is trustness: for this very service, people must be sure that the mail addresses wil not be 
given to somebody else (especially to authorities, for example).

To resume:
* the system has to "know" the mail address.
* the webmaster (or somebody else) has to be unable to find the true mail addresses.

By doing this, the webmaster will not be able to give information (even by force :)).

This is a fun problem.

Intermediate solution: I already know how to do this as soon as the information has expired. E.g. The mail address is 
encrypted with gnupg (GPG / PGP algorithms). The system (or anybody) can decrypt if he/it has the password. But as soon 
as the mail address has expired, let's revoke the secret key :arrow: one cannot decrypt the mail address anymore.

But this raises a performance problem (to create the private key)...

Any help would be most appreciated :)

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