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Cryptography is the practice and study of logical means used to achieve information confidentiality, integrity and authenticity. It covers, among other things, encryption (making some data unreadable except for those who know a given secret element, called a key), data hashing (in particular for password storage) and digital signatures (provable integrity and authenticity with non-repudiation).

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What common products use Public-key cryptography?

Asymmetric cryptography is slow, and thus reserved for small size inputs, whereas symmetric cryptography is fast. … The principle is to use Asymmetric cryptography to exchange a symmetric key with the authenticated peer, and then use AES for instance. This is how work ssh and https for instance. …
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