Quantum cryptography uses properties of quantum mechanics to securely distribute encryption keys. It allows two users to generate a shared secret key with information-theoretic security. This is accomplished through quantum key distribution, which exploits the quantum mechanical principle that measuring a quantum system can disturb the system. Even if an eavesdropper has unlimited computing power, the laws of physics guarantee the security of the key exchange. The paper introduces cryptography, traditional techniques, and the differences between traditional and quantum cryptography.

1. QUANTUM CRYPTOGRAPHY
Abstract:
This paper deals with introduction to cryptography, some of the cryptographic techniques and
introduction of quantum cryptography and differences between traditional and quantum
cryptography. Quantum cryptography is the science of exploiting quantum mechanical properties
to perform cryptographic tasks. The best known example of quantum cryptography is quantum
key distribution which offers an information-theoretically secure solution to the key
exchange problem. Quantum cryptography is an effort to allow two users of a common
communication channel to create a body off shared and secret information. This information,
which generally takes the form of a random string of bits, can be used as a conventional secret
key for secure communication. The advantage of quantum cryptography over traditional key
exchange methods is that the exchange of information can be shown to be secure in a very strong
sense, without making assumptions about the intractability of certain mathematical problems.
Even when assuming hypothetical eavesdroppers with unlimited computing power, the laws of
physics guarantee probabilistically that the secret key exchange will be secure.
Name: K. Vidya Madhuri
Roll no: 14311A1201
Year & Semester: 3rd year, 2nd semester
Branch & Section: IT-A