Key negotiation method and device

• Main Authors: CHANG WENJUAN, DAI GANG, LIANG LULU, GAN HUAN
• Format: Patent
• Language: Chinese; English
• Published: 24.10.2017
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

The invention provides a key negotiation method and a key negotiation device. When the key negotiation method is applied to field equipment, the key negotiation method comprises the steps of: generating a first random number by means of the field equipment, calculating to obtain a first sum value according to the first random number, and transmitting the first random number to routing equipment; receiving a third public key transmitted by means of the routing equipment, wherein the third public key is a second sum value obtained through calculation based on a second random number generated by the routing equipment, and calculating to obtain a shared secret key according to the third public key obtained through calculation according to the second sum value. According to the key negotiation method and the key negotiation device, the routing equipment replaces the field equipment to calculate the third public key, thereby reducing calculation amount of the field equipment. 本发明公开了种密钥协商的方法及装置，当所述密钥协商的方法应用于现场设备时，该方