Contemporary Cryptography and Arguments for Classical Cryptography's Endurance alongside the Propitious Quantum Cryptography

Contemporary Cryptography and Arguments for Classical Cryptography's Endurance alongside the Propitious Quantum Cryptography

Is the newly born quantum cryptography the ultimate solution for information security? A technique needs to be both theoretically strong and practically viable. But quantum cryptography comes to naught in the latter. We present here some of the quantum‟s theoretical weaknesses like lack of digital signatures (or any algorithm) along with its many real time implementation problems. We further pu...

On Classical and Quantum Cryptography

Lectures on classical and quantum cryptography. Contents: Private key cryp-tosystems. Elements of number theory. Public key cryptography and RSA cryp-tosystem. Shannon's entropy and mutual information. Entropic uncertainty relations. The no cloning theorem. The BB84 quantum cryptographic protocol. Security proofs. Bell's theorem. The EPRBE quantum cryptographic protocol.

Contemporary Cryptography

Quantum cryptography approaching the classical limit.

We consider the security of continuous-variable quantum cryptography as we approach the classical limit, i.e., when the unknown preparation noise at the sender's station becomes significantly noisy or thermal (even by as much as 10(4) times greater than the variance of the vacuum mode). We show that, provided the channel transmission losses do not exceed 50%, the security of quantum cryptograph...

Classical Authenticated Key Exchange and Quantum Cryptography

Cryptography plays an integral role in secure communication and is usually the strongest link in the chain of security. Yet security problems abound in electronic communication: spyware, phishing, denial of service, and side-channel attacks are still major concerns. The main goal in this thesis is to consider how cryptographic techniques can be extended to offer greater defence against these no...