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Author Topic: secure physical payment dongle development  (Read 561 times)
r2k-in-the-vortex
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June 20, 2011, 10:00:39 PM
 #1

so an idea about physical payment token arised on irc,

main points
* keypad for pc independent pin code entry
* cheap 7seg screen for payment sum confirming
* prom for program memory(possibly a protected ucontroller) to guarantee uninfected device side software
* eeprom for wallet.dat(encrypted with decryption key only on prom with read disable keys switched on prom)
* some communications with pc to get payment data for user to confirm and to sysnc wallets

benifits
* protection against infected pc, private keys never leave the device
* over the counter payment

pitfalls
* even protected ucontrollers are suspectible to power use analyzis, and other grazy hackery eg like this http://www.bit-tech.net/news/bits/2010/02/10/tpm-security-cracked-wide-open/1
* nothing protects against http://xkcd.com/538/

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