2022
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Cryptopals: Set 1 – challenge 4
Feb 18
Now that we know how to crack a single-byte XOR cipher, let’s expand and crack even more through Cryptopals’ next challenge.
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Cryptopals: Set 1 – challenge 3
Feb 17
Next up in our Cryptopals walkthrough is some frequency analysis against simple cryptographic keys. Let’s have some fun!
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Cryptopals: Set 1 – challenge 2
Feb 16
Building on our cryptopals encoding work last time, let’s introduce byte-based XOR operations.
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Cryptopals: Set 1 – challenge 1
Feb 15
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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The Cryptopals challenges
Feb 14
Starting today I kick off a series on the cryptopals crypto challenges, with my implementations in PHP. Feel free to join in the fun!
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The value of encryption
Feb 11
I care very deeply about privacy, which translates to a passion for encryption and cryptography. You should care about privacy, too.
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Information leakage and side channel attacks
Feb 8
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
Feb 3
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
Jan 31
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
Jan 30
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
Jan 29
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
Jan 28
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.