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Experimenting with Electronic Commerce on the PalmPilot

This study explores the trade-offs of electronic commerce on the PalmPilot, comparing it to smart cards and desktops. It examines cryptographic primitives and presents a PDA-PayWord implementation for small payments.

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Experimenting with Electronic Commerce on the PalmPilot

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  1. Experimenting with Electronic Commerce on the PalmPilot Neil Daswani, Dan Boneh, Stanford University

  2. Trade-offs • Vs. SmartCards • no tamper resistance • no cryptographic accelerators • direct line of communication with user • more processing power • more memory

  3. Trade-offs • Vs. Desktops • less memory • less processing power • portable

  4. Cryptographic Primitives * DES, SHA-1, RSA figures obtained with SSLeay * ECC-DSA figures obtained with Certicom Security Builder Toolkit

  5. E-Commerce on a PDA • Small payments ($5 -> $50) • Target Application: Pony Vending Machine • Pre-pay • Vendor-specific • Where to start? • PayWord (Rivest, Shamir)

  6. PDA-PayWord • PalmPilot implementation of PayWord • Minimize cryptographic operations • Minimize storage requirements

  7. User’s Wallet Bank {Yk, k, d, vid}SECC-DSA(User) Yk Pre-Paid? Yes HCC= {Yk, k, d, exp,vid}SRSA (Bank) Y1 Y0 PDA-PayWord: Withdrawal

  8. PDA-PayWord: Purchase Yk User’s Wallet Yk-i+1 Yk-i Yk-i, i, HCC Yk-i Vendor Y1 Y0

  9. PDA-PayWord: Withdrawal Timings Note: d = 5

  10. PDA-PayWord: Purchase Timings (First time $1.50 buy)

  11. Conclusions / Summary • PDA = portable commerce device w/o tamper resistance • Suitable for small payments • Commerce protocols can be adapted • Example: PDA-PayWord • leverages best of ECC and RSA Acknowledgements: Andrew Toy & Certicom

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