what's cryptography

The procedures,processes,methods,etc.,of making and using secret writing,as codes or ciphers(any of the Arabic numerals or figures).

Cryptography is the practice and study of techniques for secure communication in the presence of third parties (called adversaries).
More generally, it is about constructing and analyzing protocols that overcome the influence of adversaries and which are related to various aspects in information security such as data confidentiality, data integrity, authentication, and non-repudiation.
Modern cryptography intersects the disciplines of mathematics, computer science, and electrical engineering.
Applications of cryptography include ATM cards, computer passwords, and electronic commerce.

Cryptography  : In the computer era of data storage and transfer between the parties/ communicators,  it is necessary to maintain data confidentiality, integrity and authorization to use. Therefore, data encryption using computer based techniques plays major role in  maintaining and connecting.

 

Techniques employed in protecting integrity or secrecy of electronic messages by converting them into unreadable (cipher text) form. Only the use of a secret key can convert the cipher text back into human readable (clear text) form. Cryptography software and/or hardware devices use mathematical formulas (algorithms) to change text from one form to another.