iosr-JCE   Volume-2 ~ Issue-2

Abstract- As Vehicular networks become popular, it will provide the communication between Vehicle to Vehicle (V2V) and between Vehicles to Road side unit (V2R). Security is the main issue in VANET. As there are many aspects to improve security in VANET, but still security remains the delicate research. In this paper two methods have been proposed for maintaining the security. One method is Combo algorithm and other method is the Global System for Mobile computing (GSM) technique. The objective of combo algorithm is to achieve the principle of confidentiality, integrity, authentication and non-repudiation. This algorithm is designed by combining the two cryptography mechanism i.e. symmetric and asymmetric key; with the help of this technique we can solve the key distribution/exchange problem. The speed of encryption/decryption process is very fast in symmetric key cryptography so the process will not take much more time and the time complexity reduces. With the use of GSM technique, the authentication and confidentiality services have been achieved. Also, data transmitted in the form of voice and packets, and secure communication will takes place.
Keywords: Algorithm, GSM, RSU, V2R, V2V.

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Abstract : In this paper we present the ASIC implementation of STM-1 Framer and De-Framer. This paper mainly focuses on multiplexing digital data, transmitting and receiving the STM-1 frame. The design is implemented using Verilog HDL, simulated on Modelsim and Synthesized on Xilinx ISE 13.2. For power analysis and area calculation, the designed framer and de-framer are analysed using Cadence version 6.1.5. For debugging Chipscope Analyser has been used. The designed framer can be used for generation and analysis of STM-1 frame that has a data rate of 155.52Mbps.
Keywords - PRBS, STM-1 frame, Scrambler, Descrambler, BIP, SOH, POH.

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Abstract : To maintain data integrity hash functions are generally used. Hash function is one type of cryptographic primitives, which provide an assurance for data integrity. NAS has designed SHA hash functions which are the set of cryptographic hash function. There are so many SHA function existing in which SHA-1 produces message digest that is of 160 bits long. Later in SHA-1 has been identified security flaws, namely that a possible mathematical weakness might exist. This point out that stronger hash function would be desirable. In this paper we are proposing a new hash function, say SHA-176 that has more strength than the existing. In this we are fulfilling basic security principle i.e. integrity. Basically this hash function is developed to improve the security. Presented results are showing the performance of the proposed SHA-176 in terms of efficiency and security.
Keywords: Computer Security, SHA, Hash, Message Digest

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