Showing papers on "Cryptography published in 1970"

Dispersion of Sequences for Generating a Robust Enciphering System

Abstract: This paper introduces a new paradigm for dispersion of information into three-dimensional space to generate a strenuous crypto system. The dispersion of the information is carried out by quaternion rotation matrix which is called quadripartite public-key (QPK). We considered a private key as a unit quaternion which has an arbitrary quadruple of real numbers. The public key has three different components which are constructed using quaternion rotation matrix QRM to generate a secure key, which significantly eliminates the risk of eavesdropping. Furthermore, quaternion has capability to provide a meditative encryption system for wireless images or voice transmissions. A computer-based simulation conducted to scrutinize the capability of QPK carefully in insuring the highest level of security is reported.

Privacy and Security in Data Banks

Abstract: : The problems and implications of privacy in today's computer oriented society are many and diverse. Privacy could possibly become a non-existant commodity and the creation of large data banks containing personal information could result in 'automated blackmail'. Will the end result be a police type dossier on every citizen in the country. Some of the possible solutions both legal and technical are discussed along with some current schemes being employed to insure the privacy and security of information. Additionally, some proposals are discussed which might be used to guarantee file integrity. The application of cryptography to the security problem is also discussed.

Computer cryptographic techniques for processing and storage of confidential information

Abstract: This paper is concerned with basic techniques that are suitable for computational cryptography. The difficulties involved in constructing suitable crypto-programmes as well as the criteria for the choice of crypto-programmes are discussed. The relevant mathematical properties of transformations are worked out. On this basis, suitable transformation techniques such as arithmetical, logic, matrix, topological, functional and hierarchical schemes are described. Finally, a brief discussion is given on the system design for crypto -programming.

A Novel Chaotic Ciphering System for Color Digital Images

Abstract: Chaotic cryptology has been widely investigated recently. A common feature in the most recent developments of chaotic cryptosystems is the use of a single dynamical map in the encoding– decoding process. The main objective of this paper is to provide a set of chaotic systems instead of a single one for cryptography. We propose a symmetric key stream cipher algorithm in which multiple one-dimensional chaotic maps are used instead of a one-dimensional chaotic map. We demonstrate that the produced key streams have good statistical properties, such as uniform distribution and very height sensitivity to initial conditions. The proposed approaches are applied for color images cryptography. Analysis of the results demonstrates the robustness of the algorithm against different cryptanalysis attacks. The proposed cryptosystem is shown to be robust against brute force attack, plain text attack and differential attacks, and can achieve a ciphering rate of 40Mb/S.