Communication fingerprint extraction method and device

The embodiment of the invention provides a communication fingerprint extraction method and a device. The method comprises steps: stain marking is carried out on each data group in a network data packet and the corresponding relationship between each data group in the network data packet and the marked stain markers is recorded; program instrumentation is carried out on an application program during the process during which the application program handles the network data packet so as to acquire a program state set and a stain propagation path in which each data group operates in the application program; invariant features among at least two variables are acquired in the program state set; according to the stain propagation path, at least one data group associated with the at least one variable and marked in the network data packet is acquired; and a communication fingerprint of the application program is acquired according to the invariant features and the at least one data group associated with the at least