Information and translations of public key in the most comprehensive dictionary definitions resource on the web. Public-key definition is - a cryptographic element that is the publicly shared half of an encryption code and that can be used only to encode messages. The public key is also mathematically derived from your private key, but using reverse mathematics to derive the private key would take the world’s most powerful supercomputer many trillion years to crack. It can be used to encrypt while the private key can be used to decrypt. What does public key certificate mean? An encryption method that uses a two-part key: one private; the other public. Definition of public key in the Definitions.net dictionary. Public key cryptography is actually a fairly recent creation, dating back to 1973, it uses a public/private key pair. The encrypted message is sent and the recipient uses his or her private key to decrypt it. The private key is known only to your computer , while the public key is given by your computer to any computer that wants to communicate securely with it. Public Key vs Private Key : Public Key: Private Key: Definition: A published key that can be used to send a secure message to a receiver. What is Public Key Cryptography? Also known as asymmetric-key encryption, public-key encryption uses two different keys at once -- a combination of a private key and a public key. Sometimes referred to as asymmetric cryptography, public key cryptography is a class of cryptographic protocols based on algorithms.This method of cryptography requires two separate keys, one that is private or secret, and one that is public. One of the two keys is a public key, which anyone can use to encrypt a message for the owner of that key. Information and translations of public key certificate in the most comprehensive dictionary definitions resource on the web. See private key for more details. Public-key cryptography, or asymmetric cryptography, is an encryption scheme that uses two mathematically related, but not identical, keys - a public key and a private key. Definition of public key certificate in the Definitions.net dictionary. Unlike symmetric key algorithms that rely on one key to both encrypt and decrypt, each key performs a unique function. Meaning of public key. Public Key Cryptography, also known as asymmetric cryptography, is a popular encryption method developed by Martin Hellman and Whitfield Diffie in 1976 that is used for securing the transmission of data over distrusted networks such as the Internet. THIS DEFINITION IS FOR PERSONAL USE ONLY. The keys are asymmetric, the public key is actually derived from the private key. public key certificate: A public key certificate is a digitally signed document that serves to validate the sender's authorization and name. 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