An AFS-type vehicle headlamp is provided, and includes a bearing holder adapted to hold a bearing that is inserted into an upper support shaft of a lamp unit. The method includes identifying a tagged message, wherein the tagged message is generated by a user and includes content, obtaining context data associated with the tagged message, wherein the context data is obtained based on at least one of user input for the tagged message or server data for the tagged message, and providing access to the tagged message according to the obtained context data. If the content of the message is known, such cryptosystems may be cracked with only an erroneous signature of the message.