Cryptography-steganography system design and implementation using music

Nowadays, internet like public and unsecure channels are being used to transfer data, which must stay hidden, from source to destination rapidly. For providing the security of these data, which are sometimes vital, different cryptographic techniques are being developed and used all over the world. Another approach to this situation is steganography which provides security of the data by hiding it. In this work, cryptography and steganography are being used together to raise the security level. At first, AES-256 algorithm is used for encryption and then the output of the algorithm is being encrypted by multiplying it in finite field by the values which are obtained from the interested features of musical notes in the carrier audio file which will be used in data hiding process. After that, encrypted data is embedded in the carrier audio file by obeying the rules generated from the musical notes and as a result of that, there appears an unsuspicious audio file which includes encrypted data. Because of the values obtained from the music in the carrier audio file are used both in cryptography process and steganography process as key, there is no need to transfer data and share keys before the file transfer and thanks to that the key sharing through an unsecure channel problem is disappeared. This system ensures that, values obtained from the output file remain the same as obtained from the input file and after mathematical inverse of encryption and hiding processes the result data is definitely the same as the input data of the encryption process. Implementation of the system designed is being done with designing software and hardware units that communicates each other. Considering speed constraints, implemented subsystems are selected whether they will work on hardware unit or software unit and 2524 Mbps encryption throughput is observed in the hardware unit.