Media message transmission method and system security

The present invention relates to a secure media message transmission method and system, the method comprising: a sender of the media message using the first key encrypted with the first encryption information and the second encrypted information to obtain encrypted first key, a first transmission and the second encryption information; intermediate device generates a message corresponding to the media message using the second key of the fourth encrypted message encrypted with the third encryption information and the second encryption key encrypted with the fourth information, the third transmission, information; receiving party with its private key to obtain encrypted information to decrypt the second the fourth key, and using the second key to decrypt the encrypted information to obtain a third message, a message according to an intermediate access device acquires the first encryption information and the second encryption information, using its private key to decrypt the second encrypted information to obtain said first key using the first key to decrypt the first encrypted information to obtain the media message. The method and system of the present invention can ensure safe sender information.