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The Idea of Public Key Cryptography

The Idea of Public Key Cryptography . Cunsheng Ding HKUST, Hong Kong. The Idea of Public Key Cryptography. Put (lock, locking key) in the public domain, i.e., in a post office. Anyone who wants to send me a letter confidentially can do the following: Buy a strong box

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The Idea of Public Key Cryptography

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  1. The Idea of Public Key Cryptography Cunsheng Ding HKUST, Hong Kong

  2. The Idea of Public Key Cryptography • Put (lock, locking key) in the public domain, i.e., in a post office. • Anyone who wants to send me a letter confidentially can do the following: • Buy a strong box • Use my lock with the locking key to lock the letter inside. • Send me the locked box. Unlocking key Locking key

  3. Encryption with a Public Key System (k , k ) is the key pair of Alice Bob Alice e d file file encryted file m m E (m) Alice’s public Key k Alice’s Private Key k k e e d

  4. Digital Signature with a public key system Alice Bob (k , k ) is Bob’s key pair e d m m m||D (f(m)) k d f D (f(m)) f(m) f(m) k d

  5. Key Exchange with a Public Key System (k , k ) is the key pair of Alice Bob Alice e d session key encryted sess. key session key k E (k) k Alice’s public Key k Alice’s Private Key k k e e d Bob generates the session key k, sends Alice the encrypted session key.

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