Digital Image Signature using Triple Protection Cryptosystem (RSA, Vigenere, and MD5)

Authentication of digital media has been done with the various scheme, one of them is a digital signature. The main reason the technique of digital signature appears on the concerns of people when sending important documents and raises the thought that the file submitted is not changed when it is transmitted and the content is different when received by the recipient of the document. The digital signature attached by the sender to the document can be used as a tool to ensure that the submitted document is authentic or not manipulated. So research on digital signatures should be developed to improve its ability to provide security and prove the authenticity of the image. This paper proposes a combination of three algorithms to the created digital signature, namely: Rivest – Shamir – Adleman (RSA), Vigenere Cipher and Message Digest 5 (MD 5). The proposed method also tested with various attacks to measure the reliability of digital signatures. Various attacks which applied such as blurring, salt, and pepper, Gaussian filters. Based on the attacking result, the smallest change occurred in the blurring attack has a very good PSNR is 86.7532 dB. The experimental result proves the little change of image and filename can affect the validation result. Then, it can be concluded that the proposed method suitable for image authentication