Downloads & Free Reading Options - Results

This paper studies the security of a chaotic cryptosystem based on the Chua circuit and implemented with State Controlled Cellular Neural Networks. It is shown that the plaintext can be retrieved by ciphertext band-pass filtering after an imperfect decoding with wrong receiver parameters. It is also shown that the key space of the system can be notably reduced easing a brute force attack. The system parameters were determined with high precision through the analysis of the decoding error produced by the mismatch between receiver and transmitter parameters.

In Modern Communication wireless communication uses MIMO technique to transmit and receive data. The data security is important in communication. The various cryptography algorithm are used to insure the security of wireless communication. The extensive literature review is conducted to study the various security issues in MIMO system 

This work analyzes the security weakness of a recently proposed communication method based on chaotic modulation and masking using synchronization of two chaotic systems with different orders. It is shown that its application to secure communication is unsafe, because it can be broken in two different ways, by high-pass filtering and by reduced order system synchronization, without knowing neither the system parameter values nor the system key.

The addition of common radio frequency channels to the police communication systems of individual railroads serving a city, thus uniting, in effect, the existing police forces into one coherent unit, was considered to be a promising way to stem the amount of crime sustained by railroad companies. This concept was applied on a pilot basis to the Detroit, Michigan area, which is served by many railroad companies. To provide a measure for effectiveness, pertinent crime statistics were accumulated during equal time periods before and after the upgraded system became operational. An analysis of the data revealed that the use of this concept was very cost effective for reducing the number and severity of railroad crimes in the Detroit railroad yards.

The addition of common radio frequency channels to the police communication systems of individual railroads serving a city, thus uniting, in effect, the existing police forces into one coherent unit, was considered to be a promising way to stem the amount of crime sustained by railroad companies. This concept was applied on a pilot basis to the Detroit, Michigan area, which is served by many railroad companies. To provide a measure for effectiveness, pertinent crime statistics were accumulated during equal time periods before and after the upgraded system became operational. An analysis of the data revealed that the use of this concept was very cost effective for reducing the number and severity of railroad crimes in the Detroit railroad yards.

The research study identifies in security assistance countries some of the factors that might affect the establishment of an integrated International Logistics communication system. Through the use of a survey, it ranks countries on four factors: (1) The need for improved external communications (2) the sophistication of the existing supply system (3) the degree of centralization of the logistics organization and (4) the sophistication of internal communications. The study also acted as an informal market survey for an improved communication system that has been developed by the Air Force Logistics Command. Some of the countries surveyed are ready for improved external communications and could benefit from better communications with AFLC.

GAO-04-682 Homeland Security: Communication Protocols and Risk Communication Principles Can Assist in Refining the Advisory System Published 25-Jun-04 http://www.gao.gov/new.items/d04682.pdf (Unofficial mirror of http://www.documentcloud.org/documents/241744-homeland-security-communication-protocols-and.html)