THE UNIFIED OPERATION STRUCTURE FOR SYMMETRIC -KEY ALGORITHM

In Cloud Computing, information exchange frequently via the Internet and on-demand. Modern Internet protocols support several modes of operation to keep up with varied environments and provide the variant choice, such as SSL and IPSec support multi-mode. The different mode has the different characters. For example: CFB/OFB can be design operating without padding with bit size keystream output, CBC/CFB can self synchronize to avoid channel noise, and CFB/OFB needs encryption module only. The main emphasis is placed on the problem of case by case operation mode usage. We describe a structure for the analysis of the block operation mode combination. This unified operation structure, called UOS, combines existing in common and popular block modes of operation. UOS does multi-mode of operation with most existing popular symmetric block ciphers and do not only consist of encryption mode such as ECB, CBC, CFB and OFB, that provides confidentiality but also message authentication mode such as CBC-MAC in cryptography. It provides low-resource hardware implementation, which is proper to ubiquitous computing devices such as a sensor mote or an RFID tag. Our contribution provides a common solution for multi-mode and this is very suitable for ubiquitous computing with several resources and environments. The study indicates a better well-organized structure for symmetric block ciphers so as to improve their application scenarios.