A method for parallel authentication comprises receiving a download request from a client computer system to download a document stored in a first storage system. The first storage system is coupled to the client computer system via a network. The first storage system is coupled with a second storage system via the network. The download request includes a first token associated with the first storage system and a second token associated with the second storage system. The first storage system is configured to authenticate the download request based on the first token and the second token. Based on successful authentication, the first storage system is configured to authorize the client computer system to download the document.