Cryptopals: Set 1 – challenge 2
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Building on our cryptopals encoding work last time, let’s introduce byte-based XOR operations.
cryptography
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Cryptopals: Set 1 – challenge 1
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Challenge 1 in the cryptopals suite is to juggle between Base64 and Hex encoding of byte strings. Let’s do just that, with value objects!
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Information leakage and side channel attacks
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Side channel attacks are one of the many cryptographic footguns we need to avoid while designing and building secure applications.
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Basic cryptography – Diffie-Hellman key exchange
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How do you communicate securely over an insecure medium? Using the Diffie-Hellman key exchange to agree on an encryption key is a start!
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You absolutely SHOULD roll your own crypto
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Expert cryptographers will warn you to never roll your own algorithms. Well, they’re wrong and here are three reasons why.
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Basic cryptography – the Vigenere cipher
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The Vigenere cipher is more complicated that the Caesar cipher but based on the same idea. It uses a running key to keep your message secure.
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Different cipher types
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Anyone studying cryptography needs to understand various forms of ciphers. Today, we’ll look at three that you should know well.
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Basic cryptography – the Caesar cipher
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One of the most basic encryption schemes is the Caesar cipher. It’s weak in practice, but a great way to learn how crypto works.
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Modulo arithmetic with large numbers
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Modulo arithmetic with numbers large enough to ensure cryptographic security is complicated, particularly in PHP. Let’s work around that…
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Modulo exponentiation in PHP – three ways
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Modulo exponentiation lies at the core of most modern crypto. Learn three different ways to perform this calculation in PHP.