What kind of signature algorithm is used for the northbound interface of Visual Zhilian platform?

At present, the northbound interface of Visual Zhilian Platform supports two signature algorithms:

1、MD5(sign_method=md5).

2. HMAC MD5(sign _ method = hmac). In order to prevent malicious tampering by hackers when calling API, calling any API needs to carry a signature, and the top-level server will verify the signature according to the request parameters, and the request with illegal signature will be rejected.

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