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Quantum crypto system
- 1. Quantum Crypto System “next generation information security”
- 2. International Journal Of Application (IEEE Xplore Abstract) Outline Heisenberg Uncertainty Theorem Non-Cloning Theorem BB84 Cryptography Protocol
- 3. What is Quantum Cryptography • Quantum Cryptography is modern approach for Information Security. • Its based on physical laws. • Two element of quantum mechanism : a. Heisenberg uncertainty theorem b. Principle of photon polarization Keywords are : Quantum cryptography , Quantum key distribution ,network security
- 4. Literature Review • Quantum Cryptography was recommended by Stephen Weisner in the early 1970. • In 1984 first quantum cryptography protocol called “BB84”.
- 5. Mechanism Of Quantum Cryptography • Quantum cryptosystems depend on two important components quantum mechanics –Heisenberg uncertainty theorem and principle of photon polarization .Heisenberg uncertainty principle states that , it is impossible to determine quantum state and polarization states that it is impossible to know about unknown qubits. Quantum key distribution (QKDS) Quantum information is stored as the state of atomic or sub-atomic particles and qubit is an elementary unit of quantum information .
- 6. Quantum Cryptography Protocols • In 1984,Bennett and Brassard proposed first quantum cryptographic protocol BB84. • This work for transmission over fiber optics cable and over free space. • Another protocols are B92 cryptography protocol , EPR cryptography protocol , Quantum teleportation etc.
- 7. BB84 protocol • Most popular quantum key distribution is based on BB84 cryptography protocol .It’s depend on non-cloning theorem of non-orthogonal quantum states.BB84 works as follows:- 1.sender (suppose Alice)sends out a series of single photons. For each photon one of two possible base states , one having the possible polarization direction up/down and left/right and another one is polarization with 45 .In each case actual polarization direction is is also arbitary selected.
- 8. Continue……
- 9. Continue…. • The receiver 2 • Receiver (Bob)detects polarization of photons with base states so, half of photons will be detected with wrong base states • Then Alice and Bob use a public communication channel to talk about states used for each photons and choose suitable base state photons. • And reject all photons with wrong base states.
- 10. Advantage • Third party easy detectable . • There is not need for complex mathematic computation, so it increase computation power so it is faster than traditional approach.