In public-key cryptography - one of the basis of cryptocurrency, digital keys are generated from a large random number through a cryptograhic key generation program to produce a private key and public key. In such a system, anyone can encrypt a message using the receiver's public key, but that encrypted message can only be decrypted with the receiver's private key.
Private keys must be stored securely to maintain the safety of one's cryptocurrency. "not your keys, not your coins".
An acronym for Zero-Knowledge Succinct Non-Interactive Argument of Knowledge, zk-SNARKs refers to a protocol where one can prove posession of a given piece of information (eg a string or hash) without revealing that information and also without any interaction between both the prover & verifier.
It is a software that acts like an intermediary or a bridge that lets two applications talk to each other. It is the one that lets applications, data and devices interact.
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