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Announcements: Today: digital cash Tomorrow: quiz on ch . 6-9 8 questions Thursday: presentations

DTTF/NB479: Dszquphsbqiz Day 33. Announcements: Today: digital cash Tomorrow: quiz on ch . 6-9 8 questions Thursday: presentations Elliptic curves MD5 vulnerabilities Friday: workday for presentations. Anyone needing help can meet me in my office. Questions?.

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Announcements: Today: digital cash Tomorrow: quiz on ch . 6-9 8 questions Thursday: presentations

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  1. DTTF/NB479: Dszquphsbqiz Day 33 • Announcements: • Today: digital cash • Tomorrow: quiz on ch. 6-9 • 8 questions • Thursday: presentations • Elliptic curves • MD5 vulnerabilities • Friday: workday for presentations. • Anyone needing help can meet me in my office. • Questions?

  2. One last (set of) Schneier joke(s) • http://geekz.co.uk/schneierfacts/

  3. Digital Cash: goals • Electronic: want speed and security • Can’t be counterfeited • Anonymous: spender’s ID not disclosed to merchant • Payment done offline • Transferable • Divisible (can make change) Okimoto and Ohta: Universal electronic cash, In Proc. Advances in Computing – CRYPTO, 1991

  4. Digital Cash Exercise • T&W 11.1 summarizes a system satisfying goals 1-4 (can’t give coins away, a single denomination only) • Focus is on preventing fraud due to double-spending • Adds lots of complexity • Interpret this as “adds lots of equations” • Handout • Read/skim the 3-page summary of chapter. • Do the questions alone or with a partner.

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