Peter Kupfer OOo wrote:
I am intrigued by the idea of digital signatures.
Are there any open source (by that I mean free) digital signature services?
Depends on what you mean by "digital signature". We can divide digital
signatures into two groups:
1) One group relies on a central authority (www.thawte.com) to verify
authenticity. That is, you know that a signature is mine because the
central authority verifies that it is.
These cost money. You have to pay the central authority for the service.
2) The other group is de-centralized. You verify authenticity either
directly (e.g. we meet in person and I give you my public key) or in a
peer-to-peer sort of way (e.g. I give you Mary's public key which I
verified when she and I we met in person).
For this system, take a look at Gnu Privacy Guard:
http://gnupg.org/
If you are on Windows, you can skip right over to the Windows Privacy
Tools, which is a GUI front-end for GnuPG for Windows:
http://winpt.sourceforge.net/en/
Cheers,
Daniel.
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