Group electronic signature method

This invention discloses a group electronic signature method applicable to a group signature for documents to-be-signed by the group. This invention comprises a group identification information and a text to be signed that exists in the form of cipher text; then, the document to-be-signed and a shared group key is used to generate a group signature by using a group signature algorithm. Thus, the group signature can be used to represent electronic certificate issued by the group signature, and the text to be signed can be decrypted to obtain group signature from group members .