VOLUMINOUS AMOUNT OF CRYPTOGRAPHIC METHODS AND CRYPTOGRAPHIC ATTACKS

Today the main concern is the protection of information and it is done with encryption. It is used in almost every field of communication such as military, medical, video conferencing, broadcasting and internet communication. A cryptographed image becomes so unreadable that human eyes cannot decrypt any part of the image. Cryptography of images as compared to text is difficult due to high correlation among pixels and bulk information capacity. Cryptographic algorithm is a procedure to encrypt-decrypt message (either text or multimedia message) and to protect the encrypted message from various types of attacks. Cryptography can be done in various ways. A little knowledge is a dangerous thing, Very true in cryptography .Various cryptographic attacks are also discussed.