API (Application Program Interface) security encryption method and authentication method and application thereof

The invention provides an API (Application Program Interface) security encryption method, an API authentication method and application thereof. The API security encryption method comprises the following steps of: responding to a first API calling command of a user and generating a random unique identifier given to the user; sending an encryption request to the background through the unique identifier; the background responds to the encryption request and authenticates the unique identifier, three digits and a triangular pattern are randomly generated, the three digits are randomly attached to each point of the triangular pattern to obtain a correct key, and the correct key is returned to the user; generating a set number or a random number of error keys in the same form according to the correct key; responding to an API calling command of the user and verifying the unique identifier of the user; if the verification is passed, verifying whether the key is correct or not; and if the secret key is correct, calli