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- In this paper a session based symmetric key encryption system has beenproposed and is termed as Permutated Cipher Technique (PCT). This technique ismore fast, suitable and secure for larger files. In this technique the inputfile is broken down into blocks of various sizes (of 2 power n order) andencrypted by shifting the position of each bit by a certain value for a certainnumber of times. A key is generated randomly wherein the length of each blockis determined. Each block length generates a unique value of number of bits tobe skipped. This value determines the new position of the bits within the blockthat are to be shifted. After the shifting and inverting each block is XORedwith SHA 512 digest of the key. The resultant blocks from the cipher text. Thekey is generated according to the binary value of the input file size.Decryption is done following the same process as the technique is symmetric.

A Novel Generic Session Based Bit Level Encryption Technique to Enhance Information Security