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#Code-Based Cryptography

3 articles with this tag.

A visual representation of the BIKE key encapsulation scheme
Post-Quantum Cryptography Advanced

BIKE: Bit Flipping Key Encapsulation

BIKE is a post-quantum key encapsulation scheme built on codes with a sparse parity-check matrix. Learn how its keys hide a sparse code in a dense one, how the Black-Gray-Flip decoder removes the error, why one flipped bit is rejected, and why NIST chose HQC instead.

30 min read

A visual representation of the HQC Algorithm
Post-Quantum Cryptography Advanced

HQC (Hamming Quasi-Cyclic)

In March 2025, NIST picked a second code-based algorithm to back up Kyber. This one hides its noise completely differently from McEliece. Learn how HQC masks a public, unscrambled code with pure algebraic randomness instead.

10 min read

A visual representation of the McEliece Algorithm
Post-Quantum Cryptography Advanced

The McEliece Cryptosystem

McEliece has survived over 45 years of cryptanalysis without ever being broken. It's one of NIST's chosen post-quantum standards. Learn how hiding an error-correcting code behind scrambling matrices creates a public-key system quantum computers can't crack.

10 min read

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