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Is it possible to reuse a timestamp multiple times ?

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#20329
Posted: 06/05/2012 03:41:18
by Stephane Grobety (Priority Standard support level)
Joined: 04/18/2006
Posts: 170

Hello,

I'm working on a project that will require a number of binaries to be signed (more than 100) during a build process.

One of the part that is making that signature process slow is the fact that I have to request a new signed timestamp for every binary signed. Is there a way to reuse a timestamp for several signatures ?

I assume not but I'd rather ask than miss it.
#20331
Posted: 06/05/2012 03:47:28
by Eugene Mayevski (EldoS Corp.)

Timestamp is a cryptographic operation made over the hash of the data. If you have different data for each document, the timestamp will be different as well. Consequently you can't reuse it. To protect against replay attacks (which is what you want to do :) timestamp also includes a nonce which is different each time.


Sincerely yours
Eugene Mayevski
#20333
Posted: 06/05/2012 03:49:40
by Vsevolod Ievgiienko (EldoS Corp.)

Hello.

No you can't reuse a timestamp for multiple signatures.
#20335
Posted: 06/05/2012 03:53:01
by Stephane Grobety (Priority Standard support level)
Joined: 04/18/2006
Posts: 170

Thanks a lot for the quick answers.

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