Private key obfuscation and digital signature generation method, device, and intelligent device

The invention discloses a method for obfuscating the private key to solve the problem that the private key will appear in the digital signature process in the form of plaintext, so that an attacker may steal the private key participating in the digital signature process from the digital signature process by a certain attack mode. The method includes calculating a value of a first polynomial over afinite field according to a random number for digitally signing; According to the value of the first polynomial, obfuscating the random number; the obfuscated private key being obfuscated according to the obfuscated random number to generate the obfuscated private key for digital signature. By adopting the method, an attacker can only obtain the confused private key in the digital signature process even if the digital signature process is attacked, and the problem that the private key of the prior art will be stolen by an attacker in this case is solved. The invention also discloses a digitalgeneration method, a devi