AUTHENTICATION METHOD, ENCRYPTION METHOD, DECRYPTION METHOD, CRYPTOGRAPHIC SYSTEM AND RECORDING MEDIUM

摘要

An authentication method, encryption method, decryption method, cryptographic system and recording medium are disclosed. The present invention includes the steps of decrypting authentication information and a content provider's public key stored in a certificate signed by a certificate authority with a public key of the certificate authority to authenticate the content provider using the decrypted authentication information and authenticating the public key of the content provider by checking the decrypted public key of the content provider. And, the present invention provides the encryption method includes the steps of encrypting content data with a secret key, encrypting the secret key with a public key, and transferring the encrypted content data and the encrypted secret key.