Please help me with a response to this discussion.Thanks. Define steganography a
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Question
Please help me with a response to this discussion.Thanks.
Define steganography and discuss a method of how steganography is accomplished.
Steganography is the practice of hiding something (a message, file, picture) in another file. The most prominent example of this would be hiding a message in an image, when done right you can hide a lot of information with the image without noticeably changing it. There are many tools online you can use to hide your message in almost any image file!
What is a cryptosystem and what services can cryptosystems provide? Give an example of a cryptosystem and describe its operation.
A cryptosystem is designed to encrypt and decrypt plain text using keys. Typically, this involves key generation, encryption and decryption. An example of this would be RSA and an example of public/private key cryptography. The public key is used to encrypt data and the private key is used to decrypt messages. Public keys can be shared with anyone to share data with you, but you should keep your private key secure or else your data will not be private anymore.
Explanation / Answer
Method of accomplishing steganography
--LSB(Least significant bit) is a common method of steganography.
--Every computer file can be represented in the form of bits. Computer encodes the files in binary form and stores in its memory.So while transferring the data we can easily change the bits form to be easily readable by computer. However we need to inform the necessary changes to the belongings concerned.
--In this technique we basically change a last few bits of the entity(a message,file,picture in binary form).
-- This technique is useful in encoding the visual image. The colored image(pixels) can be easily represented in terms of 8 bits(1 bytes), which ranges from 00000000 to 11111111 in binary.
--As for example, we have a red pixel(11111111) and we use steganography(LSB methos) and change the last few bits of message,say we change it to 11111110,i.e one last bit is only changed. However when we observe the contrast in the message received by change of one bit.
---This method is very common in transferring of media files, where slight change of bytes results in small change of output media being interpreted.
Example of Cryptosystem.