Periscope Speaks HTML

I hit the jackpot at Radio Shack, so I’m back early from my last minute Christmas shopping today. That means I have time to tell you about the new Periscope 4.0 just released this week, in case you’re looking for a last minute stocking stuffer for that CAD geek friend of yours that already has …

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Digital Signatures: Practical Guidelines

We use digital signatures every time we visit a secure web site. Visiting a secure web site involves an authentication process that includes verifying the identity of the server by ensuring that its digital certificate, or “server certificate”, is signed by a trusted certificate authority. This verification process might involve verifying an entire chain of …

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Digital Signatures: Under the Hood

The basic requirements of a digital signature are that it must uniquely identify the signatory, it must be independently verifiable, and it must be invalidated if the signed data has changed. To understand how these objectives are achieved, let’s start with the foundation of modern digital signature technology: public key encryption and the public key …

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Digital Signatures: Philosophically Speaking

There is nothing magical about digital signatures. They are simply an electronic mark used to signify a promise and to cement faith in the document or transaction to which that promise is attached. Some day digital signatures will be as commonplace among CAD professionals as the human readable “wet stamp” is today. However it must …

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