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Proper password policies
A discussion of various password policies that are often enforced, their relative effectiveness and, in some cases, their harmfulness.
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Email address obfuscation
A description of email obfuscation techniques in use today, and an evidence-based comparison of which ones work.
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Fixed points of hash functions
Under what circumstances can (or must) a fixed point of a cryptographic hash function exist: where a string hashes to itself?
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Unsung benefits of IPv6
Discussion of the advantages of IPv6, other than increased address space, such as mandatory encryption and extensibility.
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Effective CPU denial of service attack using hash functions
A discussion of the exploit where, using hash collisions, a server can be DoSed using minimal bandwidth and resources.
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Mathematical quines
A demonstration of a mathematical quine: a formula which prints itself when graphed.
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Salt, pepper and rainbows: storing passwords properly
The proper methodology for storing passwords in a database. Covers hashing, rainbow tables, salting and peppering.
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The Monty Hall Problem
The somwhat counter-intuitive Monty Hall Problem, and a quick mathematical explanation and generalisation.
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Hangman strategy
The best strategy to use when choosing words in Hangman, depending on the number of guesses allowed and the length of the word.