The principal goal guiding the design of any encryption algorithm must be security against unauthorized attacks. However, for all practical applications, performance and speed are also important concerns. These are the two main characteristics that differentiate one encryption algorithm from another. This paper provides the performance comparison between four of the most commonly used encryption algorithms: DES(Data Encryption Standard), 3DES(Triple DES), BLOWFISH and AES (Rijndael).The comparison has been conducted by running several setting to process different sizes of data blocks to evaluate the algorithms encryption and decryption speed. Based on the performance analysis of these algorithms under different hardware and software platform, it has been concluded that the Blowfish is the best performing algorithm among the algorithms under the security against unauthorized attack and the speed is taken into consideration.
The mobile environment in MANETs (Mobile Ad hoc Networks) itself is a major constraint to deal with, and assuring reliability on the top of that strengthens the problem more. This paper which is entirely an extension of the authors' previous work based on trust based group formation using Fuzzy Logic. They herein propose a model which is highly inspired by natural and social behavior of human beings that man is a social animal and is always associated with different types of dynamic groups. Before ensuring the reliable route take into account the trust (T) and the speed (S) of the intermediate nodes which may take part in routing. Trust is actually a matter of feeling with which one feels connected with some person/s in the form of multicast groups. Thus, the proposed Multicast Route Reliability (MRR) is a purely a probabilistic function of Cartesian product of past relationships and present moving patterns.
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