What is key exchange?

Key Exchange

Key exchange (also known as "key establishment") is any method in cryptography by which cryptographic keys are exchanged between users, allowing use of a cryptographic algorithm.

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Some articles on key exchange:

Public-key Cryptography - History
... During the early history of cryptography, two parties would rely upon a key using a secure, but non-cryptographic, method ... For example, a face-to-face meeting or an exchange, via a trusted courier, could be used ... This key, which both parties kept absolutely secret, could then be used to exchange encrypted messages ...
Neural Cryptography - Neural Key Exchange Protocol - Security Against Quantum Computers
... Neural key exchange protocol is not based on any number theory ... Therefore, something like the neural key exchange protocol could give rise to potentially faster key exchange schemes ...
Key Exchange - The Future
... The problem of key exchange has not yet been solved ... In particular, it has not yet been solved for the modern situation of two previously unknown users attempting to communicate electronically, as, for instance, in electronic commerce ...
Key Management - Key Exchange
... In some instances this may require exchanging identical keys (in the case of a symmetric key system) ... In others it may require possessing the other party's public key ... While public keys can be openly exchanged (their corresponding private key is kept secret), symmetric keys must be exchanged over a secure communication channel ...
Password Authenticated Key Exchange By Juggling
... In cryptography, the Password Authenticated Key Exchange by Juggling (or J-PAKE) is a password-authenticated key agreement protocol ... on their shared (low-entropy) password without requiring a Public Key Infrastructure ... It provides mutual authentication to the key exchange, a feature that is lacking in the Diffie-Hellman key exchange protocol ...

Famous quotes containing the words exchange and/or key:

    I should like not to exchange any of my life for money.
    Henry David Thoreau (1817–1862)

    I cannot tell what I am as much afraid of, as a woman who invariably washes on Monday. It is a kind of key to character; and if her mouth is not puckered and her brow wrinkled, they will be, unless she repents.
    Jane Grey Swisshelm (1815–1884)