Word 'Steganography' is of Greek and it is made of two different words 'steagnos' means 'covered or protected' and 'graphein' means 'to write'. Combining these two word we find the Steaganography as the art of writing important messages in such a way that no one else apart from sender and receiver suspects the existence of hidden message.
Steganograpghy was used since ancient time. First steganography was traced back from 400 B.C. When Demaratus king of sparta send a warning about forthcoming attack on Greece by writing the message on wooden backing of the wax tablet before applying its surface.
There are a lot of examples in history who signifies the importance of Steganography.
Steganography consist two part in execution...
1. Encryption
2. Decryption
Encryption is part in which the secret and highly classified information is written or hide within some carrier which should be normal and innocent. It should drag any attraction towards it for safety of the secret message.
2. Decryption
Encryption is part in which the secret and highly classified information is written or hide within some carrier which should be normal and innocent. It should drag any attraction towards it for safety of the secret message.
Decryption is just opposite process of encryption in this the receiver decodes the encrypted message from the carrier with the help of proper technique information about which he gets from the sender.
Decrypting the hidden message is called STEGANALYSIS.
For example if there is a letter written to Mr. Robertson....
Salutations, Mr. Robertson of CIS 5371. The Florida Society of Math and Cryptography is proud to present you with an small exam for qualification into our society. The key for passing is studying. Cryptography is rigorous and only those with patience in themselves pass. We have an exam PO Box in Tallahassee. But please submit by 12/12.
The decrypted message which was hidden inside the carrier message is...
