In public key encryption, two different keys are used to encrypt and decrypt data.One is the public key and other is the private key. Even if the public key is known by everyone the intended receiver can only decode it because he alone knows the private key. A public key is used for encryption and a private key is used for decryption. In this seminar report, we review public key cryptography, and RSA public cyryptosystem in particular. cryptography, as it allows to choose cryptographic parameters in a way that is supported by a security proof, without the need to sacrifice efficiency by compensating the security loss of a reduction with larger parameters. The project has focused on many techniques of cryptography like three basic algorithms. Some digital signature algorithms DSA, Full Domain Hash, RSA-PSS, etc. The techniques of three encryptions are also encrypted. Asymmetric Key Cryptography: Under this system a pair of keys is used to encrypt and decrypt information. As mentioned in Section 1, the construction of a large-scale quantum computer would render many of these public key cryptosystems insecure. seminar report on cryptography August 10, 2014 Cryptography ... One of the discoverers of public-key encryption (along with Martin Hellman, both at Stanford University at the time), reasoned that this second requirement negated the very essence of cryptography, the ability to maintain total secrecy over your own communication. It explains how programmers and network professionals can use cryptography to maintain the privacy of computer data. These techniques came into existence with many exploitations in cryptography field to get rid of the problem like headhoc way. They are private key algorithm, public key algorithm, and the hash functions. As mentioned before, public-key cryptography is inefficient. INTRODUCTION As already mentioned, quantum key distribution (QKD) is a technique that allows two parties, conventionally called Alice and Bob, to share a common secret key for cryptographic purposes. A digital signature is simply a hash of the data to be sent encrypted using the public-key authentication method. In order to make public-key authentication practical, the digital signature was invented. 1 1. However, for many important cryptographic primitives, including digital signatures and authenticated key exchange (AKE), we In particular, this includes those This report documents the program and results of Dagstuhl seminar 16731 Public-Key Cryptography which took place September 11th -16th, 2016. Symmetric-key cryptography is sometimes called secret-Key cryptography. The most popular symmetric-key system is the Data Encryption Standard (DES). 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