Implementation Of Hybrid Cryptography Algorithm RSA-CRT And Play Fair Cipher In Image File Security

The development of technology currently allows everyone to exchange information without any limitations of time and distance. The possibility that will happen is the existence of data leakage during the process of information exchange conducted. Therefore in the data transmission, especially image, security aspects, confidentiality and efficiency of data storage are necessary. If the important information falls into the wrong hands, it will cause undesirable things, for example image manipulation with a negative shape and can harm the image owner. One of the methods used to maintain the security and confidentiality of the data one of the techniques used is RSA-CRT (Rivest Shamir Adleman-Chinese Remainder Theorem). The strength of this algorithm lies in the difficulty of calculating discrete logarithms in prime integer groups in which multiplication operations are performed. In this study, the authors combined between Playfair Cipher to encrypt image encryption and RSA-CRT Algorithm to encrypt the keys of Playfair Cipher. The image was first encrypted using the Playfair Cipher Algorithm, then the Playfair key was encrypted using the RSA- CRT Algorithm. Through testing, it can be concluded that the result of image encryption using Playfair Cipher algorithm is random and can secure image file then the Playfair key was encrypted using the RSA- CRT Algorithm. Through testing, it can be concluded that the result of image encryption using Playfair Cipher algorithm is random and can secure image file then the Playfair key was encrypted using the RSA- CRT Algorithm. Through testing, it can be concluded that the result of image encryption using Playfair Cipher algorithm is random and can secure image file