Frequency Analysis on Repeating-key XOR
A review of repeating-key XOR encryption, why it fails under frequency analysis, and how the attack works in practice.
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Bit Flip Cipher: My First Attempt at Making a Cipher
A simple symmetric cipher I built for fun using SHA-256 and XOR, and why it’s definitely not secure.
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Fibonacci LFSR: How it works and How to Attack it
Understanding the Fibonacci Linear Feedback Shift Register (LFSR), how it generates pseudo-random sequences, and why it is insecure when used as a stream cipher.
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