Quantum Cryptography. Alice. Bob. Eve. Ranveer Raaj Joyseeree & Andreas Fognini. Classical Algorithms. 1. Asymmetrical (public-key) cryptosystems:. Message. Encrypted message. Message. Public. Private. - First implementationnn RSA (Ronald Rivest, Adi Shamir, and Leonard Adleman) 1978
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Ranveer Raaj Joyseeree & Andreas Fognini
1. Asymmetrical (public-key) cryptosystems:
- First implementationnn RSA (Ronald Rivest, Adi Shamir, and Leonard Adleman) 1978
- Very convenient, Internet
- Idea is based on computational complexity f(x) = y, x = ?.
- rely on unproven assumptions
2. Symmetrical (secret-key) cryptosystems:
Distribute key over secure channel
- only provably secure cryptosystem known today
- not handy, key as long as message
- key only valid for one transmission
- how to send the key in a secure manner?
Ingredients: 1) One photon no copying,
2) Two non orthonormal bases sets
3) Insecure classical channel; Internet
What it does: Secure distribution of a key, can't be used to send messages
How it works:
Physikalische Blätter 55, 25 (1999)
Alice and Bob recognize
attack from error rate!