Multi-chip key negotiation method and multi-chip identity verification method

The invention provides a multi-chip key negotiation method, which is applied to one of a plurality of chips participating in key negotiation, and comprises the following steps: when a current chip is a first chip with a first temporary key, determining a target chip from second chips with a second temporary key; the current chip exchanges the public key with the target chip, and negotiates according to the exchanged public key to form a third temporary key; progressively increasing the number of negotiations, and judging whether the current number of negotiations is smaller than a preset number of negotiations; when the current negotiation frequency is smaller than the preset negotiation frequency, updating the third temporary key as a first temporary key of the current chip, updating parameters of the next key negotiation according to the first temporary key, and entering the next key negotiation; and when the current negotiation frequency is not less than the preset negotiation frequency, determining the cu