Complete walkthrough covering all encryption levels in Quantum Cipher Quest — from classical substitution ciphers to advanced quantum protocols.
The Caesar cipher is a classical substitution cipher where each letter is shifted by a fixed number. Learn to encrypt and decrypt messages by rotating the alphabet.
XOR (exclusive-or) encryption combines plaintext with a key using bitwise operations. Understand how XOR creates symmetric ciphers and why key length matters.
Quantum Key Distribution uses quantum mechanics to create theoretically unbreakable encryption keys. Learn the foundations of secure quantum communication.
The BB84 protocol uses photon polarization to distribute encryption keys. Any eavesdropper disturbs the quantum states, making interception detectable.
The E91 protocol leverages quantum entanglement between particle pairs to establish secure keys, exploiting Bell's theorem to detect eavesdropping.