The Data hiding concept such as steganography can provide security and facilitate the safe exchange of important information in the digital world. This concept can be used with the various multimedia such as text, image, video, audio acting as cover medium to carry out the one way exchange or two way exchange of secret information. The presented paper focusses only on the kind of steganography that uses audio as a carrier. This concept of steganography is, act of encoding mystery data in invisible manner. Steganography along with cryptography add a step futher in security by hiding cipher text in such a manner that middle man is unaware about the secret message is concealed in it. Cipher text generated by encryption creates suspects but steganography creates environment that looks like normal behavior, hiding suspect nature of cipher text thus making it more secure. Audio steganography is the investigation of concealing a few mystery content or audio data in a host audio. This paper presents execution of two level security of end user information by associating the two fields of system security, cryptography and steganography. Concept of index based chaotic sequence is used for encryption. It carries two approaches which make the cryptanalysis and steganalysis furthermore difficult as compare to simple LSB method. First approach is encrypting the secret text using index based chaotic sequence. The proposed approach is more secure, strong and robust, giving security to our secret information. Second approach is hiding output generated by first approach using the concept of LSB with XOR method. It gives extra level of security by creating minimum distortion in host audio file simultaneously maintaining high embedding capacity.