full-disclosure - Time Expiry Alogorithm??

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Message-ID: <1c2c816104111823396ca50213@mail.gmail.com>
From: gautam.singh at gmail.com (Gautam R. Singh)
Subject: Time Expiry Alogorithm??

Hi List,

I was just wondering is there any encrytpion alogortim which expires with time. 
For example an email message maybe decrypted withing 48 hours of its
delivery otherwise it become usless or cant be decrypted with the
orignal key

Gautam

-- 
Gautam R. Singh
http://gautam.techwhack.com