Vigenère cipher

Abstract: Vigenere chipper is one standard cryptographic algorithm, this algorithm very simple to use substitution as in Caesar cipher to encode the message text. One disadvantage of an extended vigenere key cipher which can determine by using a method, the method kasiski. in vigenere cipher, phrases 4/E: in the ciphertext generated from the encryption process so that the method kasiski can determine the encoded text. Goldbach codes algorithm is an algorithm for compression, which will be used to address the weaknesses in vigenere cipher. In this paper will try to discuss security with vigenere ciphertext, then ciphertext produced will be processed again using algorithms Goldbach codes. By applying the algorithm, Goldbach codes the result from the course of securing data using vigenere Chipper becomes harder to guess the original text despite using methods kasiski due to be acquired is the message of a different character. Keywords— Vigenere Cipher, Goldbach Codes Algorithm, Cryptography, Compression.

Abstract: Privacy is one of the key issues information Security addresses. Through encryption one can prevent a third party from understanding raw data during signal transmission. The encryption methods for enhancing the security of digital contents has gained high significance in the current era of breach of security and misuse of the confidential information intercepted and misused by the unauthorized parties. This paper sets out to contribute to the general body of knowledge in the area of cryptography application and by developing a new way of implementing Vigenere cipher encryption algorithm by automatically changing the cipher key after each encryption step. The new method will use successive keys that will be dependent on the initial key value during the encryption process. The algorithm ultimately makes it possible for encryption and decryption of the text. The ciphertext will have different encryption key pattern and the Vigenere cryptosystem will be more difficult to decipher using frequency attack. The implementation will be done using java programming.

Abstract: In today’s world the amount of data that is exchanged has increased in the last few years so securing the information has become a crucial task. Cryptography is an art of converting plain text message into unreadable message. Encryption algorithms play an important role in information security systems. Encryption is considered as one of the most powerful tool for secure transmission of data over the communication network. Vigenere technique is an example of polyalphabetic stream cipher; it has various limitations such as Kasiski and Friedman attack to find the length of encryption key. In this paper an enhanced version of traditional vigenere cipher has been proposed that eliminates the chances of Kaisiski and Friedman attack. Proposed technique also provides better security against cryptanalysis and pattern prediction.