期刊名称：International Journal of Computer Trends and Technology
电子版ISSN：2231-2803
出版年度：2013
卷号：4
期号：10-4
出版社：Seventh Sense Research Group
摘要：PACMA (Parallelized Adaptive Cipher with Modular Arithmetic) is a Symmetric Cryptographic Algorithm designed with traditional techniques to efficiently utilize the parallel processing capabilities of modern computing systems. It overcomes the performance inconsistencies prevalent in conventional cryptographic algorithms when they are implemented in different computing systems with different processing capabilities. The size of the key and the plain text blocks are each 1024bits. The adaptive nature of this algorithm is achieved by incorporating flexibility in the size of the key and plain text subblocks and the number of rounds. Level of Intrapacket parallelization, variety in grain size and the required security strength are achieved by suitably deciding the subblock size. Flow of the algorithm is made dynamic by determining the execution steps through each key value at runtime. In spite of these advantages the ECB mode implementation of PACMA always produces the same cipher text block for a particular plain text block when the same key is used. CBC and Interleaved CBC modes with 2way and 4way interleaving are employed to alleviate this problem. The performance of the PACMA in ECB, CBC and Interleaved CBC modes are analyzed with implementations in shared memory parallel programming environment using OpenMP, Java Threads and MPI.
