Receiver Compatible Data Hiding in Color Image (1)

Receiver Compatible Data Hiding in Color Image: 

Receiver Compatible Data Hiding in Color Image

Abstraction: : 

Abstraction : Network Security for data transmission is the most vital issue in modern communication system. Transmission of confidential information needs some sort of technique to be adopted. Trough the usage of new steganographic technique we can achieve enhanced security of data which will be useful in medical&military applications.

Introduction: : 

Introduction: The amount of digital images has increased rapidly now a days. Image security becomes increasingly important for many applications, for example, confidential transmission, and video surveillance. So we adopt some of the techniques for image security or hiding of the data image .They are CRYPTOGRAPHY STEGANOGRAPHY WATER MARKING

CRYPTOGRAPHY : 

CRYPTOGRAPHY Cryptography is the science of information security. It is also known as science of writing security code. Cryptography enables you to store sensitive information or transmit it across insecure networks (like the Internet) so that it cannot be read by any one except the intended recipient. The main objectives of cryptography are 1)confidentiality 2) integrity 3)authentication

Disadvantages:: 

Disadvantages: Despite of high speed for some cryptography methods , it may loose some information during hiding. Plainly visible encrypted messages—no matter how unbreakable—will arouse suspicion, and may in themselves be incriminating in countries where encryption is illegal .

Steganography:: 

Steganography: Due to some disadvantages in cryptography we move to steganography. Definition: Steganography is the art of hiding the fact that communication is taking place, by hiding information in other information. Many different carrier file formats can be used, but digital images are the most popular because of their frequency on the Internet.

PowerPoint Presentation: 

digital file formats that are more suitable are those with a high degree of redundancy. The redundant bits of an object are those bits that can be altered without the alteration being detected easily. Image and audio files especially comply with this requirement, while research has also uncovered other file formats that can be used for information hiding.

PowerPoint Presentation: 

Steganography differs from cryptography in the sense that where cryptography focuses on keeping the contents of a message secret, steganography focuses on keeping the existence of a message secret. Different applications require their unique steganography-technique. Applications that require absolute invisibility of the secret information varies from others require a larger secret message to be hidden.

Different techniques of steganography:: 

Different techniques of steganography:

Text steganography:: 

Text steganography: Hiding information in text is historically the most important method of steganography. An obvious method was to hide a secret message in every nth letter of every word of a text message. It is only since the beginning of the Internet and all the different digital file formats that is has decreased in importance. Text steganographyusing digital files is not used very often since text files have a very small amount of redundant data

Audio/video steganography: : 

Audio/video steganography: To hide information in audio files similar techniques are used as for image files One different technique unique to audio steganography is masking, which exploits the properties of the human ear to hide information unnoticeably. A faint, but audible, sound becomes inaudible in the presence of another louder audible sound . Although nearly equal to images in steganographic potential, the larger size of meaningful audio files makes them less popular to use than images

Protocol steganography:: 

Protocol steganography: The term protocol steganography refers to the technique of embedding information within messages and network control protocols used in network transmission. In the layers of the OSI network model there exist covert channels where steganography can be used.

Image steganography:: 

Image steganography: It is the most widely used technique that uses normal images for information transmission. Compression of pixel bit-information is the process used in this for data -security. Compression may be lossy/lossless. This method mainly involves two groups: transform domain image domain

Different types of image formats:: 

Different types of image formats:

Transform domain:: 

Transform domain: Jpeg(joint photographic experts group) : The JPEG file format is the most popular image file format on the Internet, because of the small size of the image. One of these properties of JPEG is exploited to make the changes to the image invisible to the human eye. Spread spectrum: Spread spectrum techniques satisfies most requirements and is especially robust against statistical attacks, since the hidden information is scattered throughout the image, while not changing the statistical properties

Image domain:: 

Image domain: Patchwork: Patchwork is most suitable for transmitting a small amount of very sensitive information. LSB in GIF (graphic interchange format): LSB in GIF is a very efficient algorithm to use when embedding a reasonable amount of data in a grey scale image. LSB in Bitmap : LSB in BMP is most suitable for applications where the focus is on the amount of information to be transmitted and not on the secrecy of that information

Watermarking:: 

Watermarking: Watermarking is the process of embedding information into a digital signal which may be used to verify its authenticity or the identity of its owners. In digital watermarking, the signal may be audio, pictures, or video. This watermarking technique is visible or invisible .

Disadvantage:: 

Disadvantage: A disadvantage of digital watermarking is that a subscriber cannot significantly alter some files without sacrificing the quality or utility of the data.

Conclusion: 

Conclusion We can conclude that the suitability of steganography as a tool to conceal highly sensitive information has been discussed that suggests transmission of encrypted data is secure.