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I am doing B Sc IT. Could you please tell me something about cryptography?
An interdisciplinary subject, drawing from several disciplines, Cryptography is a field of mathematics and computer science concerned with information security and related issues, particularly encryption.
Historically, cryptography was concerned solely with encryption which is a means of converting information from its normal, comprehensible form into an incomprehensible format, rendering it unreadable without secret knowledge. It was used primarily to ensure secrecy in important communications, such as those of spies, military leaders, and diplomats.
In recent decades, the field has expanded beyond secrecy to include techniques for authentication, signatures, interactive proofs, secure computation, steganography, and others. While it is now a tool used within computer and network security, it is also considered a branch of engineering, albeit an unusual one.
Mainly concerned with patterns in language earlier, the emphasis has now shifted, and cryptographers extensively use mathematics, particularly discrete mathematics, including topics from number theory, information theory, computational complexity, statistics and combinatorics - a branch of mathematics concerned with the selection, arrangement, and operation of elements within sets.
I suggest you do a google search on the word cryptography (I just did, and was rewarded with loads and loads of fascinating info on the subject).
(Online Resources )