Doing business securely in a public place
There are a variety of ways to use USB devices to carry out secure computing. One approach is called a Trust Extension Device and is described at ScienceDaily:
CSIRO has developed a prototype portable device that will allow people to do business across the internet on any computer in a trusted manner.
Known as a Trust Extension Device (TED), the TED consists of software loaded onto a portable device, such as a USB memory stick or a mobile phone. It is able to minimise the risk associated with performing transactions in untrusted and unknown computing environments.
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