No abstract

Data encryption has become one of the most important factors in computer security. The DES 56-bit symmetric algorithm was developed in the 1970s and was replaced with the AES 128-bit symmetric algorithm in 2001. The DES 56-bit was very popular and widely accepted for many years but with the increase in computer attacks had to be upgraded to the AES 128bit algorithm. This research presents the ASE and DES algorithm for 16-bits Unicode Thai characters in the range of 0E00 to 0E7F. In the study the table matching technique has been added to decrypt and encrypt the Thai characters. In order to evaluate the efficiency of the proposed method an application program was developed to simulate the operation of the proposed method.