BROADCAST ENCRYPTION METHOD AND BROADCAST DECRYPTION METHOD THEREOF

摘要

A broadcasting encoding method and a decoding method thereof are provided to perform broadcasting encoding and decoding as reducing a transmission amount and a storage amount by using Strong Diffie-Hellman tuple. A broadcasting encoding method comprises the following steps of: generating a message encoding key by using a public key and a secrete key generated by using Strong Diffie-Hellman tuple(S210); encoding a message through the message encoding key(S220); and generating a message header by using a sum of things belonging to a user group among the Strong Diffie-Hellman tuple(S230).