Diffie-Hellman Key Exchange(a part of ElGamal)

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除了RSA之外 ，Other Public-key cryptosystems are :

• ElGamal cryptographic(Diffie-Hellman key exchange)
• Elliptic curve cryptography(Elliptic curve arithmetic)

还有Pseudorandom number generation based on an asymmetric cipher知识点，中文叫 基于非对称密码的伪随机数发生器

choose secret key: XA<q

Compute public key: YA=a^XA mod q

Diffie-Hellman秘钥交换的过程如下图：

Elgamal Cryptography