Cryptography involves the hiding of the specific meaning of messages, but not their existence. The study also contributes to the development of computer science, particularly in the techniques used in network securities. It is crucial in application in the spheres that involve extensive and sensitive levels of access control and information confidentiality. Cryptography is also used in ATM cards and computer passwords and even within the world of electronic commerce. The hidden numbers that are a part of sensitive information that is also customer specific in the application of the various identification codes like the PIN and TIN numbers issued to customers by the credit card companies and the banking institutions, depend upon the effective use of cryptography.

Cryptography involves the hiding of the specific meaning of messages, but not their existence. The study also contributes to the development of computer science, particularly in the techniques used in network securities. It is crucial in application in the spheres that involve extensive and sensitive levels of access control and information confidentiality. Cryptography is also used in ATM cards and computer passwords and even within the world of electronic commerce. The hidden numbers that are a part of sensitive information that is also customer specific in the application of the various identification codes like the PIN and TIN numbers issued to customers by the credit card companies and the banking institutions, depend upon the effective use of cryptography.

Cryptography is the study and practice of information which is coded or hidden. It is considered as a branch of mathematics and computer sciences.

There are numerous applications of Cryptography. We use it somehow or the other in our daily lives. The ATM cards are the best modern example of cryptography. Apart from that Computer passwords, electronic commerce all use cryptography in one way or the other.

Our passwords and pin codes are all encrypted on our ATM cards or computers. And only we can access our accounts because we know what the secret codes are.

Cryptography is basically the process of hiding information in order to protect the sensitive information, data or message from unknown attacks for any reasons. Cryptography actually consists of two terms encryption and decryption. The process in which message is ciphered or encrypted is known as encryption and the process in which message is deciphered at recipients end is known as decryption.

And this whole process is known as cryptography. Public keys and private keys are used in the process of cryptography. Cryptography can be seen as symmetric and asymmetric. In symmetric cryptography same key is used for both encryption and decryption while in asymmetric different keys are used for both encryption and decryption.

Today Cryptography is used in various fields like ATM, e-banking, IT security, Maths etc.

The term cipher is also used to refer to different categories of algorithm in cryptography. This is not to say that every sender-receiver pair needs its very own unique cipher for a secure communication. Instead, through the use of public ciphers with secret keys, one cipher can serve millions of communicating pairs. A key is a number (value) that the cipher, as an algorithm operates on. To encrypt a message we need an encryption algorithm, an encryption key and the plain text. These create the cipher text. To decrypt a message, we need a decryption algorithm, a decryption key, and the cipher text. These reveal the original plain text. In cryptography the encryption or decryption algorithms are public; the keys are secret.