According to Computerworld, the mobile phone application stores passwords, PINs and TANs (transaction authentication numbers). Those codes are encrypted and can only be revealed by entering a master password.
The key to Mobile Sitter is that it will always return an answer regardless of what master password is entered. The attacker will never know if the master password is right or wrong. And they wouldn't know the returned value is incorrect until they tried to use the card.
Fraunhofer directly sells MobileSitter for $13.45 from its Web site.
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