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NEW CONCEPT OF SYMMETRIC ENCRYPTION ALGORITHM A HYBRID APPROACH OF CAESAR CIPHER AND COLUMNAR TRANSPOSITION IN MULTI STAGES

Dharmendra Kumar Gupta, Sumit kumar srivastava, Vedpal Singh

Internet and networks applications are growing very fast, so the needs to protect such applications are increased. Encryption algorithms play a main role in information security systems. This work gives an insight into the new concept called hybrid approach of conventional encryption, which gives the concept of strong encryption of the data. The symmetric encryption also called conventional encryption or single key encryption was the only type of encryption is use prior to the development of public-key encryption. All the conventional encryption algorithms are very weak concept of encryption and brute-force attack and cryptanalysis attacks can easily determined the plain text. With the increasing use of the secure transmission of data and information over the internet, the need of strong encryption algorithm increasing day by day. In this work of encryption technique we present a new concept of conventional or symmetric encryption algorithm that hybrid two primitive (i.e. Caesar Cipher and Columnar Transposition) and weak approach of encryption algorithm in multi stages to make the new approach more secure and strong than the earlier concept. The core of this algorithm is the use of two different secret keys for the Caesar Cipher and Columnar Transposition respectively. The cryptanalysis attack can not determine the plaintext easily, brute-force attack required long time to obtain plaintext. The mechanism used for this new hybrid algorithm is, first encrypt the message by applying Caesar Cipher technique and again Transpose the encrypted message receive from the Caesar Cipher, this process repeat again and again as many times as number of digits in the secret key for the Caesar cipher.