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Cryptography, or cryptology (from ancient greek A protocol describes how the algorithms should be used and includes details about data structures and representations, at which point it can be used to implement multiple, interoperable versions of a program. The following outline is provided as an overview of and topical guide to cryptography

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Modern cryptography intersects the disciplines of mathematics, computer science, and engineering In theoretical cryptography, the security level of a cryptographic hash function has been defined using the following properties Applications of cryptography include atm cards, computer passwords, and electronic commerce.

History of cryptography cryptography, the use of codes and ciphers, began thousands of years ago

[1] until recent decades, it has been the story of what might be called classical cryptography — that is, of methods of encryption that use pen and paper, or perhaps simple mechanical aids. Each key pair consists of a public key and a corresponding private key An alternative, less common term is encipherment To encipher or encode is to convert information into cipher or code.

In cryptography, a cryptosystem is a suite of cryptographic algorithms needed to implement a particular security service, such as confidentiality (encryption) [1] typically, a cryptosystem consists of three algorithms One for key generation, one for encryption, and one for decryption The term cipher (sometimes cypher) is often used to refer to a pair of algorithms, one for encryption and.

The most obvious and, in principle at least, simplest way of cracking a code is to steal the codebook through bribery, burglary, or raiding parties — procedures sometimes glorified by the phrase practical cryptography — and this is a weakness for both codes and ciphers, though codebooks are generally larger and used longer than cipher keys.