Jisho

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こうかいかぎあんごう 公開鍵暗号
Noun
1. public key encryptionComputing
Wikipedia definition
2. Public-key cryptographyPublic-key cryptography refers to a cryptographic system requiring two separate keys, one to lock or encrypt the plaintext, and one to unlock or decrypt the cyphertext. Neither key will do both functions. One of these keys is published or public and the other is kept private. If the lock/encryption key is the one published then the system enables private communication from the public to the unlocking key's owner.
Read “Public-key cryptography” on English Wikipedia
Read “公開鍵暗号” on Japanese Wikipedia
Read “Public-key cryptography” on DBpedia

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