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Re: Re; Time Expiry Algorithm
From: Andrew Farmer <andfarm () teknovis com>
Date: Sun, 21 Nov 2004 15:52:50 -0800

On 21 Nov 2004, at 00:14, Jacqueline Singh wrote:
Gautam R. Singh <gautam.singh () gmail com> wrote:
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

No. Think about it for a moment.

(Clocks can be changed.)

What if you decided to code into the encryption the use of atomic
clocks, and include more than one or two as a redundancy/security
check?

That's an implementation, not an algorithm.

An encryption *algorithm* must be a fixed set of rules that map inputs to outputs. In your proposed algorithm, one of the inputs is the current time - and that can be changed, by the *definition* of an algorithm.

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