Cryptography

TOFU and Public Key Pinning: Trust on First Use, Verify Thereafter

Cryptography · Nov 2, 2026 · 4 min

End-to-End Encryption Comparison: WhatsApp, Signal, Telegram, and Self-Hosted Solutions

Cryptography · Oct 30, 2026 · 5 min

Shamir's Secret Sharing: Split a Private Key into $n$ Shares, Recover It from Any $k$

Cryptography · Oct 20, 2026 · 4 min

Post-Quantum Cryptography Explained

Cryptography · Oct 19, 2026 · 21 min

How Mathematicians Broke Enigma: Permutation Groups and Conjugation

Cryptography · Oct 9, 2026 · 5 min

The One-Time Pad and Shannon: The Only Cipher Proven "Absolutely Secure"

Cryptography · Sep 27, 2026 · 4 min

Schnorr Signatures and Σ-Protocols: The Simplest Zero-Knowledge Proof

Cryptography · Jul 31, 2026 · 4 min

The Birthday Paradox and Hash Collisions: Why SHA-256 Has Only 128-Bit Collision Resistance

Cryptography · Apr 24, 2026 · 4 min

Homomorphic Encryption Explained

Cryptography · Apr 9, 2026 · 19 min

Isogeny Cryptography and the Death of SIKE: A Laptop Breaks a NIST Candidate in an Hour

Cryptography · Feb 21, 2026 · 5 min

Bilinear Pairings and BLS Signatures: Compressing Ten Thousand Signatures into One

Cryptography · Feb 4, 2026 · 4 min

Diffie–Hellman and the Discrete Logarithm: Why Prime-Order Subgroups

Cryptography · Dec 8, 2025 · 5 min

Forward Secrecy: If Today's Key is Lost, Are Yesterday's Secrets Still Safe?

Cryptography · Nov 29, 2025 · 5 min

Where Primes Come From: The Fermat Test, Carmichael Numbers and Miller–Rabin

Cryptography · Nov 18, 2025 · 5 min

The Chinese Remainder Theorem: One Theorem Holding Up Half of Cryptography

Cryptography · Nov 11, 2025 · 4 min

The Finite Field Inside AES: The S-box Is Really an Inverse in $\mathbb{F}_{2^8}$

Cryptography · Oct 29, 2025 · 4 min

LLL Lattice Reduction: How the Knapsack Cryptosystem Fell

Cryptography · Sep 29, 2025 · 6 min

Why RSA Decrypts Correctly: Euler's Theorem and the Chinese Remainder Theorem

Cryptography · Jun 9, 2025 · 5 min

Linear Feedback Shift Registers: Primitive Polynomials over $\mathbb{F}_2[x]$ and Stream Ciphers

Cryptography · May 5, 2025 · 5 min

Casting Out Nines and Check Digits

Cryptography · May 4, 2025 · 15 min

Elliptic Curves: Why Points on a Curve Can Be "Added"

Cryptography · Apr 25, 2025 · 5 min

Envelope Encryption: Asymmetric for the Key, Symmetric for the Data

Cryptography · Mar 2, 2025 · 5 min