Informatics Publishing Limited

Shikha Kuchhal , Ishank Kuchhal

Abstract

Organizations in both public and private sectors have increasingly dependent on electronic data processing. Protecting these data is of utmost concern to the organizations and cryptography is one of the primary ways to do the job. Cryptography is a German word which means secret writing. Cryptography is necessary while communicating over any untrusted medium, which includes just about any network, particularly the Internet. Encryption and decryption algorithm’s security depends on the algorithm as well as on the key’s confidentiality, once the key is leaked, it means any one can encrypt or decrypt the data, it means the whole procedure become useless. Therefore, how to distribute the private key and how to save both transmission keys are very important. This document briefly introduces the concept of RSA algorithm, and, thereby design and analyze the performance of our improved implementation. We have developed a program for encrypting and decrypting text files. In addition, the encryption procedure and code implementation is provided.

 

Keywords

RSA, encryption, decryption, MATLAB

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Shikha Kuchhal , Rakesh Verma

Abstract

Reversible logic is an emerging research area. Interest in reversible logic is sparked by its applications in several technologies, such as quantum, CMOS, optical and nanotechnology. Reversible implementations are also found in thermodynamics and adiabatic CMOS. Power dissipation in modern technologies is an important issue, and overheating is a serious concern for both manufacturer and customer. One of the main benefits that reversible logic brings is theoretically zero power dissipation in the sense that, independently of underlying technology, irreversibility means heat generation.Synthesis of multiple-output functions has to be done in terms of reversible objects. This usually results in addition of garbage bits which in contrast to the nonreversible case is technologically difficult and expensive. The amount of garbage is a very important criterion for a good synthesis procedure, since in most technologies the addition of only one bit of garbage is very expensive or even impossible to implement. Minimal garbage realization may require a larger number of gates in the circuit, but it is better to have a large but working circuit than a small one that is not ready for the technology.Encryption system demands not only high security but low power consumption. Reversible logic arose more and more attention in the recent past due to its less heat dissipating characteristics. We analysis the functional module of DES system, and designed respectively a reversible circuit of a 4-bit counter and a reversible circuit of two-way shift register. By using a series of reversible device, we realized the design of reversible circuits for the functional modules.

Keywords

Encryption, Cryptography, Reversible Logic, DES

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