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ABSTRACT
In the current internet community, secure data transfer is limited due to its attack made on data communication. So more robust methods are chosen so that they ensure secured data transfer. One of the solutions which came to the rescue is the technologies called Steganography Cryptography together. Steganography is the art and science of writing hidden messages in such a way
that no one apart from the intended recipient knows of the existence of the message. Cryptography is the science of writing in secret code and is an ancient art . The media we choosed in the stegnography is Audio media. This technology uses the advantages of Human Auditory System(HAS) in hiding the plain text. But existing audio steganographic systems have poor interface, very low level implementation, difficult to understand and valid only for certain audio formats with restricted message size.
Data Seclusion in Audio files is one proposed system which is based on audio
Steganography and cryptography, ensures secure data transfer between the source and destination. This uses most powerful encryption algorithm in the first level of security, which is very complex to break. In the second level it uses a more powerful modified LSB (Least Significant Bit) Algorithm to encode the
message into audio. It performs bit level manipulation to encode the message.
The basic idea behind this paper is to provide a good, efficient method for hiding the data from hackers and sent to the destination in a safer manner. Though it is well modulated software it has been limited to certain restrictions. The quality of sound depends on the size of the audio which the user selects and length of the message. Though it shows bit level deviations in the frequency chart, as a whole the change in the audio cannot be determined..
1. INTRODUCTION
Steganography is the practice of hiding information “in plain sight”. This technique relies on a message being encoded and hidden in a transport layer in such a way as to make the
existence of the message unknown to an observer. Importantly, the transport layer - the
carrier file - is not secret and can therefore be viewed by observers from whom the secret
message itself should be concealed. The power of steganography is in hiding the secret message
by obscurity, hiding its existence in a non-secret file. In that sense, steganography is different from cryptography, which involves making the content of the secret message unreadable while not preventing non-intended observers from learning about its existence1. Because the success
of the technique depends entirely on the ability to hide the message such that an observer would not suspect it is there at all, the greatest effort must go into ensuring that the message is invisible unless one knows what to look for. The way in which this is done will differ for the specific media that are used to hide the information. In each case, the value of a steganographic approach can be measured by how much information can be concealed in a carrier before it becomes detectable, each technique can thus be thought of in terms of its capacity for information hiding.
There are numerous methods used to hide information inside of Picture, Audio and
Audio files. The two most common methods are LSB (Least Significant Byte) and Injection.
The existing system of Audio Steganography poses more restrictions on the choosing of audio files. User can select only wav files to encode. It supports water marking method to encode .It complexity arises when more message to be encoded. The message length is restricted to 500 characters. It doesn’t shows the variations occurred after encoding the message. The LSB algorithm in the existing system is not efficient because it hides the message in consecutive bytes received from audio files.
Enhanced Audio Steganography is a method of hiding the message in the audio file of any formats. EAS provides an easy way of implementation of mechanisms when compared with audio steganography. Apart from the encoding and decoding in Audio steganography, This contain extra layers of encryption and decryption. The four layers in our system are
 Encryption
 Encoding
 Decoding
 Decryption
1.1 PROBLEM DEFINITION
The message or file that is transferred over internet is less secure because it is at a risk of being attacked. In order to prevent third party from knowing the information being sent we use this steganographic application.
1.2 APPROACH
As we mentioned above the problem definition and to achieve that we approached the following steps so as to simplify over all complexity we moduled into two parts they are
 Encoding
• Generate File Chooser using java
• Embed the text file into Audio file using LSB method
• Verify Options
 Decoding
• Select the Embedded file using File Chooser
• Extract the text file
• Display the secret text
2. LITERATURE SURVEY
2.1 STEGANOGRAPHY
Steganography is the science of hiding information. It is the art and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message, a form of security through obscurity. The word ‘steganography’ is of Greek origin and means "concealed writing" from the Greek words steganos meaning "covered or protected", and graphein meaning "to write". The advantage of steganography, over cryptography alone, is that messages do not attract attention to themselves.
For example, Amy wants to send a secret message (M) to Bret using a random ® harmless
message to create a cover © which can be sent to Bret without raising suspicion. Amy then
changes the cover message © to a stego-object (S) by embedding the secret message (M) into
the cover message © by using a stego-key (K). Amy should then be able to send the stegoobject
(S) to Bret without being detected by Crystal. Bret will then be able to read the secret message (M) because he knows the stego-key (K) used to embed it into the cover message ©. "in a 'perfect' system, a normal cover should not be distinguishable from a stego-object, neither by a human nor by a computer looking for statistical patterns." In practice, however, this is not always the case. In order to embed secret data into a cover message, the cover must contain a sufficient amount of redundant data or noise. This is because the embedding process Steganography uses actually replaces this redundant data with the secret message. This limits the types of data that we can use with Steganography. In practice, there are basically three types of steganographic protocols used. They are Pure Steganography, Secret Key Steganography and Public Key Steganography. Pure Steganography is defined as a steganographic system that does not require the exchange of a cipher such as a stego-key. This method of Steganography is the least secure means by which to communicate secretly because the sender and receiver can rely only upon the presumption that no other parties are aware of this secret message. Using open systems such as the Internet, we know this is not the case at all. Secret Key Steganography is defined as a steganographic system that requires the exchange of a secret key (stego-key) prior to communication. Secret Key Steganography takes a cover message and embeds the secret message inside of it by using a secret key (stego-key). Only the parties who know the secret key can reverse the process and read the secret message. Unlike Pure Steganography where a perceived invisible communication channel is present, Secret Key Steganography exchanges a stego-key, which makes it more susceptible to interception. The benefit to Secret Key Steganography is even if it is intercepted, only parties who know the secret key can extract the secret message. Public Key Steganography takes the concepts from Public Key Cryptography as explained below. Public Key Steganography is defined as a steganographic system that uses a
public key and a private key to secure the communication between the parties wanting to communicate secretly. The sender will use the public key during the encoding process and only the private key, which has a direct mathematical relationship with the public key, can decipher
the secret message. Public Key Steganography provides a more robust way of implementing a steganographic system because it can utilize a much more robust and researched technology in Public Key Cryptography. It also has multiple levels of security in that unwanted parties must first suspect the use of steganography and then they would have to find a way to crack the algorithm used by the public key system before they could intercept the secret message.
Encoding Secret Messages in Audio
Encoding secret messages in audio is the most challenging technique to use when dealing with Steganography. This is because the human auditory system (HAS) has such a dynamic range that it can listen over. To put this in perspective, the (HAS) perceives over a range of power greater than one million to one and a range of frequencies greater than one thousand to one making it extremely hard to add or remove data from the original data structure. The only weakness in the (HAS) comes at trying to differentiate sounds (loud sounds drown out quiet sounds) and this is what must be exploited to encode secret messages in audio without being detected. There are two concepts to consider before choosing an encoding technique for audio. They are the digital format of the audio and the transmission medium of the audio. There are three main digital audio formats typically in use. They are Sample Quantization, Temporal Sampling Rate and Perceptual Sampling. Sample Quantization which is a 16-bit linear sampling architecture used by popular audio formats such as (.WAV,.AU and. AIFF). Temporal Sampling Rate uses selectable frequencies (in the KHz) to sample the audio. Generally, the higher the sampling rate is, the
2.2 CRYPTOGRAPHY
Cryptography is a method of storing and transmitting data in a form that only those it is intended for can read and process. It is a science of protecting information by encoding it into an unreadable format. Cryptography is an effective way of protecting sensitive information as it is stored on media or transmitted through network communication paths. Although the ultimate goal of cryptography, and the mechanisms that make it up, is to hide information from unauthorized individuals, most algorithms can be broken and the information can be revealed if the attacker has enough time, desire, and resources. So a more realistic goal of cryptography is to make obtaining the information too work-intensive to be worth it to the attacker. The first encryption methods date back to 4,000 years ago and were considered more of an ancient art. As encryption evolved, it was mainly used to pass messages through hostile environments of war, crisis, and for negotiation processes between conflicting groups of people. Throughout history, individuals and governments have worked to protect communication by encrypting it. As time went on, the encryption algorithms and the devices that used them increased in complexity, new methods and algorithms were continually introduced, and it became an integrated part of the computing world.
Encryption is a method of transforming original data, called plaintext or cleartext, into a form that appears to be random and unreadable, which is called ciphertext. Plaintext
is either in a form that can be understood by a person (a document) or by a computer (executable code). Once it is transformed into ciphertext, neither human nor machine can properly process it until it is decrypted. This enables the transmission of confidential information over insecure channels without unauthorized disclosure. When data is stored on a computer, it is usually protected by logical and physical access controls. When this same sensitive information is sent over a network, it can no longer take these controls for granted, and the information is in a much more vulnerable state.
2.3 PASSWORD BASED ENCRYPTION
Password-Based Encryption
Password-Based Encryption (PBE) derives an encryption key from a password. In order to make the task of getting from password to key very time-consuming for an attacker, most PBE implementations will mix in a random number, known as a salt, to create the key.
Cipher
Encryption and decryption are done using a cipher. A cipher is an object capable of carrying out encryption and decryption according to an encryption scheme (algorithm).
Key Agreement
Key agreement is a protocol by which 2 or more parties can establish the same cryptographic keys, without having to exchange any secret information.
Message Authentication Code
A Message Authentication Code (MAC) provides a way to check the integrity of information transmitted over or stored in an unreliable medium, based on a secret key. Typically, message authentication codes are used between two parties that share a secret key in order to validate information transmitted between these parties.