Bonn-Aachen International Center
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cosec >students >Teaching >IPEC Winter 2008 

e€ (electronic cash)


Joachim von zur Gathen


Michael Nüsken

Time & Place

Start: Monday 31 March at 0900 in the b-it Hörsaal.


Pre-exam meeting: 7 May 2008, 1700, Cafeteria/b-it lawn.

The exam will be on 20 May 2008 in the time between 1130 and 1415 o'clock in b-it Marschallsaal.

There will be a post-exam meeting on NN in the b-it, room NN. At this occasion you can also review our ranking of your exam.


Other than with common electronic transactions electronic money shall behave much more like usual money. We want it to be anonymous, indistinguishable, yet traceable in case of emergency. And one shall not be able to duplicate it.

Topics include

We deal with a completely new kind of money. Many have already bought things in the internet and know various of ways how the article is payed then. Mostly, the money is transferred using one's bank account or via a credit card. Electronic money to the contrary consist only of bits... The right bits at the right moment are money for the recipient. He can deposit it at his bank account just like ordinary money. And the bank will not know where the money comes from. Similarly, the sender's bank will not know where the money goes to. And despite all this you must not be able to copy electronic money and just pay a second time with the very same bits. How to achieve all this shall be worked out in this workshop.

Lecture Notes

The lecture notes now contain all slides, now also the posters, and the programs and logs produced by the course.  Further, here are some notes including also number theory and cryptography basics.

Links to up-to-date literature

That's what you found:


2+2 SWS, 4 credits.


The course will be held in English.

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