Abstract: The present document discloses methods, systems and terminals for controlling encryption of information and analyzing information. The method for controlling encryption of information includes: determining a content of a message required to be encrypted when it is detected that the message needs to be encrypted and transmitted; combining and encrypting the content of the message required to be encrypted and a time parameter indicating a decryption time limit of the message to generate an encrypted data block; and sending the message in which the encrypted data block is carried.