Monthly Archive: October 2015

Oct 26

Why Java keeps plugging along

When I was a young programmer, COBOL was the primary “enterprise” business language. It had a few advantages: everyone knew it, hardware supported it, libraries extended it, no one got fired for using it. There were several other languages out there, that were used for various projects – FORTRAN, C, Pascal, Ada , to name …

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Oct 07

A step-by-step walkthrough of public key signing

Continuing on from my previous walkthrough on public-key cryptography, I also wanted to learn how you can sign documents using the private key, verifying the signature with the public key. The concept here is verification – was this message sent by someone with access to a specific private key.    For example, consider Paul Revere, …

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Oct 07

A step-by-step walkthrough of public key cryptography

The basic concept of public-key cryptography (specifically, the RSA version) is always described as “finding the factors of large numbers is hard”.   So if you can find two large prime numbers, and multiply them together, you get a very large number that is incredibly hard to factorize. But I’ve struggled with understanding how you …

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