Signed URLs permit access to resources without requiring updates to policies or other configuration settings. These URLs are usually temporary and only valid for a limited period. Cloud providers generate a hash value for each signed URL to authenticate access requests. If the hash value is missing or expired, access to the resource is denied.Here’s an example signed URL with an access token generated by the server hosting the file as the hash value:
Although some cloud providers let you limit signed URLs to specific IP addresses or address blocks, we recommend using other security measures, such as a short-lived expiration time, to avoid issues in processing assets.