Authentication
AK/SK-based authentication is used for calling APIs. Specifically, requests are encrypted using the access key ID (AK) and secret access key (SK) to provide higher security.
AK/SK Authentication

- AK/SK authentication supports API requests with a body not larger than 12 MB. For API requests with a larger body, token authentication is recommended.
- The AK/SK can either be permanent or temporary. If it is temporary, the X-Security-Token field must be included in the request header. The value is the security token of the temporary AK/SK.
In AK/SK authentication, AK/SK is used to sign requests and the signature is then added to the requests for authentication.
- AK: access key ID, which is a unique identifier used in conjunction with a secret access key to sign requests cryptographically.
- SK: secret access key, which is used in conjunction with an AK to sign requests cryptographically. It identifies a request sender and prevents the request from being modified.
In AK/SK authentication, you can use an AK/SK to sign requests based on the signature algorithm or using the signing SDK. For details about how to sign requests and use the signing SDK, see API Request Signing Guide.

The signing SDK is only used for signing requests and is different from the SDKs provided by services.
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