A robust encryption method for speech data hiding in digital images for optimized security

Steganography is a art of hiding information in a host signal. It is very important to hide the secret data efficiently, as many attacks made on the data communication. The host signal can be a still image, speech or video and the message signal that is hidden in the host signal can be a text, image or an audio signal. The cryptography concept is used for locking the secret message in the cover file. The cryptography makes the secret message not understood unless the decryption key is available. It is related with constructing and analyzing various methods that overcome the influence of third parties. Modern cryptography works on the disciplines like mathematics, computer science and electrical engineering. In this paper a symmetric key is developed which consists of reshuffling and secret arrangement of secret signal data bits in cover signal data bits. In this paper the authors have performed the encryption process on secret speech signal data bits-level to achieve greater strength of encryption which is hidden inside the cover image. The encryption algorithm applied with embedding method is the robust secure method for data hiding.