10 © Copyright 2004, Credentica On dual-chip mobile devices Client device contains two chips GSM SIM card Tamper-resistant chip (following WIM specifications) In 2002 – 2003, Nokia and Nordea conducted a pilot for a dual-chip WAP phone ( EMPS ) Aimed at secure Internet banking and credit card payments M-cash can exploit dual chip presence: Tamper-resistant chip provides prior restraint against double- spending (2 nd layer of defence) Tamper-resistant chip can enable single-token payment of any amount (e-cheque payments, tick payments) Many applications can piggyback on the same tamper-resistant chip when using Digital Credentials technology – Can use cheap 8-bit chip (no crypto coprocessor needed)
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