Making the High Security of Repeated Hashing Practical

  Last week I explained how repeated hashing works. Our user Alice can prove that she knows her secret without exposing that secret, and the server can verify this without knowing what her secret is. The follow-up question is – how to make it practical? My explanation last week told you how repeated hashing works, but […]
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10 Free Resources for Informal Learning

As one who embraces learning at all levels, I thought I’d use this opportunity to share a brief list of valuable informal learning resources with you. It’s not practical to attend a formal school even part-time for one’s whole life, and we need to supplement other formal learning (such as Learning Tree and company courses) […]
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Tackling a new dataset

With all the excitement (hype?) surrounding machine learning, there’s a tendency for decision makers (and many analysts) to believe that insights are just waiting to spring forth from the data when they are finally released by these magical algorithms. When it’s time to sit down and actually work with a real dataset, disillusionment quickly sets […]
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We Need Something Better Than Passwords, And We Already Have It

A technology called repeated hashing provides user authentication that can only be defeated by guessing the user’s secret or traveling back in time. Since the second is impossible, this is as good as user authentication security can get. Hashing, Again and Again In Learning Tree’s System and Network Security Introduction course we explain hash functions. […]
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Guidelines for Destroying Data and Devices

In the News Reporters and pundits alike in the US news media have been discussing data and device destruction recently. In particular, they’ve been discussing data destruction with, for example, BleachBit, and device destruction with a sledgehammer. I have not heard any of them discuss the rules NIST (the National Institute of Standards and Technology) […]
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