A network device for maintaining data security generates different keys corresponding to data received from a sender. The different keys comprise a secret key, a client key, and a server key. The client and server keys form the secret key when combined. The network device encrypts the data with the secret key and discards the secret key in response. The network device generates a Uniform Resource Locator (URL) for requesting the data from the network device. The URL comprises the client key and a randomly-generated data identifier associated with the data. The network device sends the URL to an electronic address of a recipient and discards the client key in response.