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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

The Idea of Public Key Cryptography

Cunsheng Ding

HKUST, Hong Kong

the idea of public key cryptography1
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

encryption with a public key system
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

digital signature with a public key system
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

slide5

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.