Client and host validation based on hash of key and validation of encrypted data

摘要

A data security protection method generates dynamic encryption keys and dynamic decryption keys for a host and a client during data transmission between the host and the client. The host stores a host initial key K₀, and determines a host key K_n using a one-way hash function based on the host initial key K₀. The client stores a client initial key K′₀, and determines a client key K′_n using the one-way hash function based on the client initial key K′₀. Original data R_n is encrypted as encrypted data X_n using the host key K_n before being sent to the client. The client decrypts the encrypted data X_n using the client key K′_n, to obtain the original data R_n.