1 / 5

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

wynonna
Download Presentation

The Idea of Public Key Cryptography

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related