Hi Folks,

Ed Felten has an interesting post on his blog about a Dutch smartcard
based transportation payment system that has been broken. Among other
foolishness, the designers used a custom cryptosystem and 48 bit keys.

Not to defend the designers in any way or fashion, but I'd like to ask, How much security can you put into a plastic card, the size of a credit card, that has to perform its function in a secure manner, all in under 2 seconds (in under 1 second in parts of Asia)? And it has to do this while receiving its power via the electromagnetic field being generated by the reader.

Aram Perez

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