🔐 Quantum Cryptography
Secure communication in the quantum age
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🔐 The Quantum Security Revolution
Modern encryption relies on computational hardness—RSA, ECC, Diffie-Hellman depend on factoring and discrete log being difficult. Quantum computers break these assumptions. But quantum mechanics also offers unconditionally secure communication via Quantum Key Distribution (QKD).
💡 The Quantum Threat
Shor's algorithm on a large-scale quantum computer can factor 2048-bit RSA keys in hours—breaking encryption protecting internet traffic, financial transactions, government secrets, and personal data worldwide.
Classical factoring (2048-bit):~300 trillion years
Quantum factoring (Shor):~8 hours
🎯 What You'll Master
🔑
Quantum Key Distribution
BB84, E91, and secure protocols
⚠️
Quantum Threats
Shor's algorithm and vulnerabilities
🛡️
Post-Quantum Crypto
Lattice-based, hash-based schemes
🌐
Quantum Internet
Global secure networks
🔒 Classical vs Quantum Security
🖥️Classical Crypto
Security basis:Computational
Assumption:Hard problems
Quantum safe:No (broken)
Key exchange:Diffie-Hellman
⚛️Quantum Crypto
Security basis:Physical laws
Assumption:None (provable)
Quantum safe:Yes (immune)
Key exchange:QKD (BB84)
🎯 QKD Protocols
BB84Deployed
Security: Unconditional
Efficiency: 50%
E91 (Entanglement)Research
Security: Unconditional
Efficiency: 50%
B92 (2-state)Research
Security: Unconditional
Efficiency: 25%
CV-QKDCommercial
Security: Practical
Efficiency: 80%