Wildcard identity-based key derivation encryption and decryption method

摘要

A key issuing, encryption and decryption method including a wildcard is disclosed. A key issuing method including a wildcard for a particular layer comprises: selecting at least one group element; Selecting a plurality of random values; Constructing a key pattern for the selected group element; And generating a secret key list for the key pattern using the plurality of random values and the public key, wherein the secret key list includes at least one of a plurality of keys included in the key pattern, And includes a secret key and a supplementary key that can be replaced by all possible combination pattern configurations.