See private key for more details. Information and translations of public key in the most comprehensive dictionary definitions resource on the web. A Definition of Public Key Cryptography. Public key cryptography is actually a fairly recent creation, dating back to 1973, it uses a public/private key pair. Definition of Public Key Cryptography in the Network Encyclopedia. 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. 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. Meaning of public key certificate. An encryption key that can be made public or sent by ordinary means such as an email message. The keys are asymmetric, the public key is actually derived from the private key. One of the two keys is a public key, which anyone can use to encrypt a message for the owner of that key. 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. 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. What is Public Key Cryptography? An encryption method that uses a two-part key: one private; the other public. Public key encryption is a type of cipher architecture known as public key cryptography that utilizes two keys, or a key pair, to encrypt and decrypt data. Applies to : … THIS DEFINITION IS FOR PERSONAL USE ONLY. What does public key certificate mean? It can be used to encrypt while the private key can be used to decrypt. The encrypted message is sent and the recipient uses his or her private key to decrypt it. 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. 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. A secret key that can be used to decrypt messages encrypted with the corresponding public or private key. 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. public key certificate: A public key certificate is a digitally signed document that serves to validate the sender's authorization and name. Definition of public key in the Definitions.net dictionary. 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