Modified Caesar Cipher method applied on Generalized Modified Vernam Cipher method with feedback, MSA method and NJJSA method: STJA Algorithm

摘要

In this paper the authors present a new combined symmetric-key cryptographic method, named STJA, which is basically based on modified Caesar Cipher, generalized modified Vernam Cipher, MSA and NJJSA. The cryptanalysis shows that TTJSA and TTSJA are free from standard cryptographic attacks such as differential attack, plain text attack or any brute force attack In the present method the authors have used generalized modified Caesar Cipher method, where the authors have modified the standard Caesar Cipher method and then they applied TTJSA method to make the entire crypto system very hard to break. TTJSA is also a combined symmetric key cryptographic method. In modern world keeping the data safe online is most important and of highest concern. For this reason, this combined cryptographic method, STJA is used, so that it is almost difficult for cryptographic hackers to break the cryptography method. This method has been tested on different plain text, consisting of different ASCII values (even with ASCII value 1,2,3 and so on) and the spectral analysis of the plain text and the encrypted is also been shown. The spectral analysis shows that the present cryptography method, STJA can not be broken with any kind of standard cryptography attack.