An Improved AES Key Generation in Audio Steganography

Abstract

The higher Internet use also affects the level of information security in the digital world. Nowadays, many users send private messages or even secret messages through the Internet. This has an impact on the increasing number of illegal people who try to see and even change the information for personal gain. There is a solution to this problem by inserting a secret message in a file such as images, audio, or video. To increase the level of security, secret messages are encrypted first using cryptographic techniques. In this paper we propose a method for developing key generation in audio steganography techniques using the AES (Advanced Encryption Standard) algorithm. We use additional parameters to create the AES key, i.e. the user’s identity. The user’s identity is entered into the key table which is then randomly selected by the system when the user wants to get the key. There is a combination process and hash function to add complexity to the key. The performance of the proposed method is tested based on computing time and audio signal strength. The test results show that the message inserted in the audio file does not affect the file size, but rather affects the audio signal strength. Audio signals that experience additional data are at frequencies of 15 to 20 kHz and for other frequencies only experience additional noise.