Slave device authentication method and system for master device

Abstract

The invention discloses a slave device authentication method and system for a master device. The authentication method comprises the following steps: a common parameter, a symmetric key, a pseudo-random function, and a public key / private key between the master device and a slave device are generated, and the master device reads and records the data of the current state of the slave device and then sends challenge information to the slave device; the slave device outputs a random shared key corresponding to the challenge information and a data identifier by virtue of the pseudo-random function with a seed key, and then generates a digital signature corresponding to the read data according to the private key and the random shared key; after receiving response information containing the digital signature, the master device recovers the corresponding random shared key by virtue of the symmetric key and the pseudo-random function first and then authenticates the effectiveness of the response information in combination with the public key and the digital signature. The method can authenticate a plurality of slave devices at the same time and has the advantages of high computational efficiency and low communication cost.

Description

technical field [0001] The invention belongs to the technical field of authentication of electronic equipment, and in particular relates to a method and system for authenticating a master device to its slave devices. Background technique [0002] Electronic equipment and electronic accessories have been widely used in many fields, such as electronic communication equipment such as computers, smart phones, and network devices, electronic equipment and electronic accessories such as B-ultrasound, nuclear magnetic resonance imaging, and hyperbaric oxygen chambers in medical and health care. Generally speaking, brand-name electronic equipment and accessories with pure quality and good reputation are favored by consumers. At the same time, counterfeit well-known brand-name products made of inferior materials are increasingly becoming a major target for counterfeiters. In order to protect the interests of electronic equipment and its accessories companies and consumers, related i...

AI Technical Summary

Problems solved by technology

The second method mainly relies on the relevant algorithms of the cryptographic system; the security properties of these algorithms only depend on the secrecy of the key, rather than on the idea that the manufacturer's technology is superior to the counterfeiter; its anti-counterfeiting protection level mainly depends on The length of the key used in the cryptographic algorithm makes it difficult for counterfeiters to imitate by expanding the length of the key

However, the authentication of devices and data disclosed in this patent has the following defects: (1) In order to calculate the shared key SK, both the slave device and the master device require the scalar multiplication calculation of points on the elliptic curve, so the authentication of the slave device is required The integrated circuit (IC) must configure the chip to realize the calculation, which increases the manufacturing cost of the general slave device; (2) this patent only considers the authentication of one master device to one slave device, and many master devices are often configured with multiple slaves, sometimes several slaves need to be authenticated at the same time

Images