What is Cryptography?
Cryptography is both the practice and study of the techniques used to communicate and/or store information or data privately and securely, without being intercepted by third parties. This can include processes such as encryption, hashing, and steganography. Cryptography is a broad field with applications in many critical areas of our lives.
Cryptography is the art and science of making a cryptosystem that is capable of providing information security.
Cryptography deals with the actual securing of digital data. It refers to the design of mechanisms based on mathematical algorithms that provide fundamental information security services. You can think of cryptography as the establishment of a large toolkit containing different techniques in security applications.