Design and implementation stegocrypto based on elgamal elliptic curve

Well-known techniques for securing data are cryptography and steganography. Cryptography is an information security technique that turns information into another random and incomprehensible form, while steganography secures data by hiding information in storage media such as text, images, sound and video. In this research will be merged both security techniques, namely Stegocrypto. This stegocrypto uses ElGamal's elliptic curve for the coding process and utilizes noise as a steganographic medium. The elliptic curve used in this study has 2026 pairs of points. While the input of this system is an ASCII character, so input should be represented first before being processed. The process of inserting cipher with noise is done without using a marker. In this study, the stegocrypto system was successfully implemented. The system successfully encrypts and decrypts the input message. Decryption is done by reading all received stego-noise and will be read as cipher text when it is an elliptic group element. Then from the test is also obtained the influence of message length and k variables to the time required for the process of encryption and decryption.