This research presents experimental research of data encrypted data to compare the moment processing of data encryption and decryption of data 3 algorithm. The algorithm used to compare is DES, Blowfish and AES-128. Bring three algorithms encrypt data with different data. Data files of type text (.txt) alone and Data files of type text, image (.doc) is the same size. The file is divided into two files and two language is Thai the English. The last file is an image file (.jpg) one file. All data files will be through data encryption and decryption of data 15 times to find out the average processing time of data encryption and decryption. Then the average value of all, the algorithm compares the average of the period in order to obtain the best value and the most suitable of the codes and decoding the data.
The research found that the size of the plain text affect differences in average processing time of encoding and decoding the data and information is the average minimum AES128