Fraudsters Use Padlocks, Too: More on Certificate Use and Abuse

A couple of months I wrote here about HTTPS and website security from a user standpoint. I need to add to that because bad guys can also use the digital certificates that make browsers show green padlocks or avoid notices about unencrypted sites. The issue here is that the certificate that lets a site use […]
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GDPR: What You Need to Know and Do

GDPR or the General Data Protection Regulation takes effect next May. It’s an EU regulation. However, everyone must comply with it or else suffer heavy financial penalties and risk criminal prosecution. What Is GDPR? Simply put, the GDPR requires strong protection of personal privacy of people in the EU. Violations can lead to crippling fines, […]
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Cyber Security Requires Cautious Logic

If we don’t carefully distinguish between necessary and sufficient when we are analyzing information assurance systems, we may become dangerously confident in a system that is actually quite weak. This Isn’t A New Problem Cryptography enthusiast Edgar Allan Poe wrote, in “A Few Words On Secret Writing” in Graham’s Magazine in July 1841: “Few persons […]
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An Introduction: Using CrypTool to Show How Ciphers Work

In Learning Tree’s System and Network Security Introduction, we use a tool called CrypTool. It is a fun tool for illustrating the operation of ciphers, hashes, digital signatures and the like. This week, I’ll start with a demonstration of some basic encrypting and decrypting and in the future, I’ll discuss other features. In the examples […]
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Skeptical Looks at Cryptography

We cannot have cyber security without cryptography! Confidentiality requires encryption of the sensitive data. Integrity is important, hash functions let us detect inappropriate modification of data and system configurations. Authentication of users and hosts can be done in many ways, and the more secure methods involve hash functions, encryption, or some combination of the two. […]
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