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Abstract-Cryptography and encryptions, these terms are now-a-days have an unseen impact in the emerging field of network and its security. As security of data on any kind of system has became the first priority for the organization, the methods which are used to ensure security not only need to be strong and efficient, but should also be easy to execute and implemented. With progress in technology, encryption came up with a big boom, taken as a weapon of ultimate security. It is an earliest art and it is defined as the science of writing in secret code. Basically, the cryptography algorithms are categorized into two types on the basis of key management, which are key-oriented and keyless encryption algorithms. The prime goal leading the design of an encryption algorithm must provide security against unauthorized attacks. Key-oriented algorithms are very efficient but they were very bulky to manage as key handling must be done. Due to the great overhead, keyless algorithms seem an attractive option. But what about security by keyless, here is the solution-KUDOS encryption, which is a keyless security algorithm to provide ultimate security at the one level above of key-oriented.

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An Algorithm is considered computationally secure if it can not be broken with standard resources, either current or future. In this paper we have introduced a new block cipher algorithm named X-MODDES. It is unique independent approach which uses several computational steps along with string of operators and randomized delimiter selections by using some suitable mathematical logic. X-MODDES is specially designed to produce different cipher texts by applying same key on same plain text. Thus a new protocol has been designed to encrypt a given text, which allows a higher level security as compare to MODDES. The Algorithm is successfully implemented on text file, corresponding digital image file and audio file. Here we have also tried to highlight the performance of some well known data algorithms like DES, Triple-DES, AES (Rijndael), MODDES, and compare them with the X-MODDES. Finally it has been proved that X-MODDES is one of the best performing partial symmetric key algorithm among the above mention algorithms particularly for the text message with limited size.

Abstract-Present era is the information age where information is money and its security is the primary concern. If the organization has faster access to accurate and up-to-date information then correct business decisions can be taken in time to achieve business excellence and uphold an edge over competitors. Various kinds of security mechanisms like cryptography and steganography are extensively employed to keep the information secure and to send it over the network. However cryptography approach is more widely implied than steganography approach because of enhanced security and simplicity. Fundamental goal of any cryptographic algorithm is to provide defence against unauthorized attacks. In this paper, we have proposed a new image encryption algorithm named Stream Encryption Standard for Digital Images (SES) for meeting the requirements of secure image transfer. The results of several experimental and statistical analysis demonstrate that the proposed image encryption scheme provides a proficient and secure way for image encryption. This new algorithm is based on the symmetric key encryption approach.