Systems and methods for securely performing digital commerce. A user device provides a first key and a random number to a server over a first network, encrypts the random number and a user identifier using the first key, and sends the encrypted information to the server via a second network. The server generates an encryption of the random number, the user identifier, and a second key using the first key. The user device receives, decrypts and stores the second key. If the user device wants digital content, the server encrypts the digital content using a digital content key and encrypts the digital content key using the second key. The user device receive the encrypted contents, decrypts the digital content key using the second key and decrypts the digital content using the decrypted digital content key. Digital content can be passed to other user devices.