Was surfing around, and suddenly thought of something related to EZ-Link. And then, it's information gathering time…
Found the following information at Wikipedia:
The EZ-Link card operates on a radio frequency (RF) interface of 13.56MHz at 212 kbit/s, with the potential for communication speeds in excess of 847 kbit/s. It employs the Manchester bit coding scheme for noise tolerance against distance fluctuation between the card and the contactless reader, and implements the Triple DES algorithm for security.
Here's the link to more information: http://en.wikipedia.org/wiki/EZ-Link.
Interesting… Ok back to TV. TV also interesting.. =p