Abstract: The present invention provides a data hiding method via revision records on a collaboration platform, which first creates a collaborative database including a plurality of articles and revision records. A user puts as input a cover document, a secret message, and a key on a collaboration platform. Based on four characteristics of multi-user collaborative-writing processing, the collaborative-writing platform is used, together with a key, to hide a secret message into the cover document automatically while simulating a collaborative-writing process and generate a stego-document where the secret message is hidden. Only authorized users with the key can extract the right secret message from the stego-document i.e. the message-hidden document successfully.