Patent ID: 7827291

Claim:
A system, comprising: a first, substantially portable and physically non-secure computerized device; a second, substantially portable and physically non-secure computerized device in data communication with said first device; a first computer program operative to run on said first computerized device and to obtain at least one temporary address for said first computerized device; a second computer program operative to run on said first computerized device and adapted to establish a non-permanent security association between said first and second devices, said second computer program comprising a cryptographic data exchange algorithm adapted to cause said first computerized device and said second device to exchange cryptographic data, said data being substantially unique to said security association; and a third computer program operative to run on said first computerized device and adapted to seal or encrypt data sent from said first device using at least one cryptographic key; wherein said at least one cryptographic key is derived based at least in part on first data that is uniquely associated with one of said first and second substantially portable and physically non-secure computerized devices.