Performances Combination Schemes AES-Turbo Code Based-on Keys Length

Abstract

In data communication the process of sending data in the form of information is susceptible to theft, destruction, modification or repetition of the data sent which causes information to be changed / corrupted according to the original data. One way to guarantee authenticity can be done by utilizing security techniques in the process of sending data, one of which is by using a combination of cryptographic and error correction techniques, namely AES and Turbo Code. This study aims to combine the two techniques and apply them to text data by evaluating based on the length of AES encryption keys. Performance results indicate that AES-Turbo cryptographic combination algorithms can work optimally at SNR greater than or equal to 15 dB, for the best test value for avalanche effects is 24.77 % at 256-bit key lengths and the testing data execution time with an average time of 9.19 seconds, the time required for decryption is longer than the time needed for encryption, and the longer the key the longer it takes for encryption and decryption. For selection of keys length of AES more efficiency and effectiveness that is by using 128-bit key.