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Steganography Case Study

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Chapter 1 INTRODUCTION The purpose of Steganography is to hide the data into other data, but in cryptography the data is encrypted into any random stream of bytes. As there is no random data in the computers thus it can be easily detectable over transmission from one source to destination. Steganography uses the concept to mix the data into other data so that it can look as structured format and it can’t be detectable while transmission. 1.1 Introduction to Steganography Steganography is a technique to hide the secret message in the carrier so that it can’t be easily detected and securely transfer over the internet. The message can be text or the image that is to transfer and the carrier is the cover image in which the secret message or secret …show more content…

To reduce the size of Stego image we use compression techniques so that Stego image can be send over the internet without noticed and in less time of transfer. Figure 3 Image Steganography Lossless and Lossy are two types of image compression. In lossless compression the size of the image nearly remains same as of the original image and the embedded data in Stego image is not lost in this compression but in lossy compression the size of the Stego image is reduced from original image and the embedded data in the Stego image can be lost after this compression. • Audio/Video In this the carrier is the Audio/Video file in which the secret message is to be hide. The message is hide in the binary sequence of the digital audio file. The binary sequence is changed with the bits of secret message that is to embed in the file. We also use Echo as another method to hide the secret message in the audio file. Echo is introduced in the sequence of the audio/video file. The bit of echo is changed to embed the secret data. Echo is of very short length (1ms) so that it can’t be noticed by human …show more content…

• Commonly used file format The format that we used for Stego image should be common on the internet so that it can’t easily detect. The algorithm should be independent of the file format so that it can give output in any type of image file format. Using this type of algorithm we can select cover image of any format and gets the Stego image of any file format. • Size of file The size of the Stego image file after the embedding of the secret data should be same or slightly greater than the original image. If it increases abnormally then it would become suspicious file while transferring over the communication channel. • Identification of Stego Image The algorithm after embedding the data should not leave any signature, logo or mark on the Stego image so that the Stego image can’t be easily identified by human eyes. Advantages of

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