How I Was Wrong About Kerberos

Microsoft’s Active Directory includes a version of Kerberos that has had a bad reputation. There were problems several years ago, but the criticisms are now outdated. What was the problem, and how has it been fixed? Origins of Active Directory Windows 2000 was originally going to be called Windows NT 5.0. It was released in […]
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How to Practice Linux Skills for Free

Colleagues and friends often ask me how they can learn or practice Linux when they only have Windows at work and a single family Windows computer at home, for free. That’s a good question, and there are a couple of different answers. Before we get to the free methods, I want to acknowledge that there […]
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How to Verify Windows File Integrity with Hashes

As I write this, I am developing a skill (app) for Amazon’s Alexa voice service. A couple of days into the development I thought I’d accidently corrupted a critical file. Fortunately, I hadn’t, but it reminded me of the practice of discovering file changes by comparing file hash values against a baseline. The basic idea […]
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Compress or Encrypt?

The other day a colleague sent me some files in email. He compressed them so they’d be smaller and no software along the way would try to process them. (As a side note, yes, I know email systems use BASE64 to encode binary files, and I know that blows them up in size, but that’s […]
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A cool Windows tool I’d never heard of

I am finally getting around to cleaning up my office. It’s been a few years and there are a lot of electronic gadgets including computers, KVMs and so forth that were for projects long past and I need to make room for more current projects and their associated stuff. One thing I had to deal […]
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