proxies(編輯修改稿)
2025-06-16 18:08 本頁面
【文章內(nèi)容簡介】 – Decrypting function extracts original message – Encryption key parameter that controls encryption/decryption。 sender and receiver share secret key Encryption and privacy ? Sender produces: E = encrypt(K, M) ? Sender transmits E on work ? Receiver extracts: M = decrypt(K, E) Public key encryption ? Previous scheme requires shared secret K ? If K is discovered, security is promised ? Public key encryption uses two keys: – Private key kept secret by user – Public key published by user ? To send to user, encrypt using public key, decrypt using private key PGP ? lio/1997/crypto/ Digital signatures ? Goal guarantee that message must have originated with certain entity ? Idea encrypt with private key, decrypt with public key ? Only owner of private key could have generated original message Packet filtering ? Can configure packet
教學課件相關推薦
鄂ICP備17016276號-1