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There are several zipping software that allow users to encrypt their data before zipping. Do any of these use Trusted Timestamps to set an expiration date for decryption? http://en.wikipedia.org/wiki/Trusted_timestamping

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Trusted timestamps don't set an expiration date for decryption. To do that, you need some trusted entity that will perform some operation up to a particular date and then will refuse to do it. – David Schwartz Sep 23 '13 at 20:06
    
But they way they would do it is by issuing a trusted timestamp, right? Are there any encryption tools that offer this at encryption time? I guess zipping could be preformed independent of encryption. – tir38 Sep 24 '13 at 21:27

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