Digital signature method and device

The embodiment of the invention discloses a digital signature method and device. The method comprises the steps of: when the fact that an appointed operation is executed is monitored, obtaining an operation object corresponding to the appointed operation; obtaining an adjacent object pre-established for the operation object, and respectively performing digital signature of the operation object and the adjacent object, so that corresponding digital signature values are obtained; and, on the basis of the obtained digital signature value of the operation object and the obtained digital signature value of the adjacent object, obtaining an associated digital signature value of the adjacent object. Thereby, on the basis of the combination of the digital signature value of the operation object and the digital signature value of the adjacent object, the associated digital signature value of the adjacent object is obtained; therefore, when the operation object is deleted or the correct operation object, which is deleted originally, is inserted, verification is carried out through the associated digital signature value of the corresponding adjacent object; therefore, illegal operation is identified; the information security of data is improved; and thus, the integrity and the authenticity of the data are ensured.