Difference between classical encryption and quantum encryption.

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1. Classical Encryption

• Definition: Uses mathematical algorithms to protect information, relying on problems that are hard for classical computers to solve.

• Techniques:

  • Symmetric encryption (e.g., AES, DES) → same key for encryption and decryption.

  • Asymmetric encryption (e.g., RSA, ECC) → uses public and private keys.

• Security Basis: Hard mathematical problems (like factoring large numbers or solving discrete logarithms).

• Vulnerability: Secure against classical computers, but many algorithms (RSA, ECC) can be broken by quantum computers using Shor’s algorithm.

• Example: Your credit card details encrypted with RSA when you shop online.

2. Quantum Encryption

• Definition: Uses the principles of quantum mechanics to secure information, not just mathematics.

• Main Technique: Quantum Key Distribution (QKD) – keys are exchanged using quantum particles (like photons).

• Security Basis:

  • Quantum principles like superposition and entanglement.

  • No-cloning theorem ensures quantum states cannot be copied.

  • Any eavesdropping attempt disturbs the quantum state, making it detectable.

• Advantage: Offers information-theoretic security (provably unbreakable), unlike classical encryption which can be cracked if the math problem is solved.

• Example: BB84 protocol (the most famous QKD scheme).

Key Differences

Feature	Classical Encryption	Quantum Encryption
Basis	Complex math problems	Quantum mechanics laws
Keys	Shared using algorithms	Shared using quantum particles (QKD)
Security	Computational (can be broken with enough power)	Provably secure, eavesdropping is detectable
Vulnerability	Breakable by quantum computers	Secure even against quantum computers
Examples	RSA, AES, ECC	BB84, E91, Quantum Key Distribution systems

✅ In summary:

• Classical encryption = math-based, efficient, but vulnerable to quantum attacks.

• Quantum encryption = physics-based, highly secure, detects eavesdropping, but currently harder to implement widely.

Read More  :

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What is post-quantum cryptography?

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