A cryptographic nonce is an abbreviation for a 'number used once', and is used in cryptography to increase communication security against hackers attempting replay attacks and/or dictionary attacks. A nonce is an arbitrary number that is intended for one time use, and can sometimes combined with a timestamp which ensures that the nonce's identity is associated with a single time value. Cryptographic nonce's do not need to be random numbers, but the creation of pseudorandom nonce's are known to increase security. Nonce's are often used in two-factor authentication systems and cryptocurrencies such as Bitcoin.
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- CryptocurrencyA cryptocurrency (or crypto currency) is a digital asset designed to work as a medium of exchange using cryptography to secure the transactions and to control the creation of additional units of the currency. Cryptocurrencies are a subset of alternative currencies, or specifically of digital currencies.
- BlockchainA blockchain is an append-only digital ledger storing a set of time-ordered transactions grouped in blocks that are linked together using cryptographic hashes.
- Multi-factor authenticationMethod of computer access control