CSCI-UA.0480-11: Intro to Computer Security Homework 1

CSCI-UA.0480-11: Intro to Computer Security Spring 2019
Homework 1
via classes.nyu.edu1. Threat modeling: Imagine you’ve just been hired to produce a comprehensive threat model for
CitiBike , New York’s public bike share system. Describe three security policies, and for each of
them describe a technical mechanism to enforce those policies. Choose one policy each that
deals with a threat from thieves (financially motivated attackers), terrorists (attackers aiming to
cause violent disruption) and trolls (attackers trying to cause inconvenience or annoyance).
2. Hash functions : In class we discussed several desirable properties for hash functions, in
particular one-wayness and collision-resistance . In this exercise, we’ll show that neither property
implies the other. We can do this by counter-example:

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