PPT-CRMA: Collision Resistant Multiple Access

Lili Qiu University of Texas at Austin Joint work with Tianji Li Mi Kyung Han Apurv Bhartia Eric Rozner Yin Zhang Brad Zarikoff ACM MobiCom 2011 1 Motivation. Generic . b. irthday attack. Online Cryptography Course Dan Boneh. Generic attack on C.R. functions. Let H: M .  {0,1}. n. . be a hash function . ( |M| >> 2. Constructing Compression . F. unctions. Online Cryptography Course Dan Boneh. The . Merkle-Damgard. iterated construction. Thm. : h collision resistant ⇒ H collision resistant. Author. : . Ioannis. . Karamouzas. et al.. Presented. . by. : Jessica . Siewert. Content of presentation. Previous work. The method. Implementation. Experiments. Assessment. Developments since . Introduction – Previous work. Huaqing. Zhang. Wireless Networking, Signal Processing and Security Lab. Department of Electrical and Computer Engineering. University of Houston, TX, USA. Sep. 2016. Evolution of Multiple Access Technology. . California Highway Patrol – . Crescent City . Area. Population – . 27,212 (. As of 2014. ) . Roughly . 1,230. . square miles. Mountain. . to . Ocean/Sea Level . conditions. CHP Jurisdiction. Kris Hauser. ECE 383 / ME 442. Fall 2015. 3D models in robotics. Design. Simulation. Robot collision detection (i.e. prediction). Proximity calculation. Map building. Object recognition. Grasp planning. Why good practice ?. accountability. reputation. efficiency . repeatable. systematic. representative. Indicators of good practice. documented. Bird survey design at any proposed development should focus on:. By Jonathan. Recap:. Last week we talked about countersteering. What was . countersteering. ?. Turn in the other direction in order to complete a turn.. A while back we mentioned velocity. What was . By: Matt . Boggus. Outline. Collision tests. Pixel-pixel. Square-square. Axis-aligned bounding box (rectangle) testing. Collision detection loops. Exhaustive comparison. Static objects vs. dynamic objects. Kris Hauser. I400/B659: Intelligent Robotics. Spring 2014. 3D models in robotics. Design. Simulation. Robot collision detection (i.e. prediction). Proximity calculation. Map building. Object recognition. CHEMICAL RESISTANT And CATERING CHEMICAL RESISTANT LIGHT DUTY MEDIUM DUTY IMPACT RESISTANT HEAVY DUTY ABRASION RESISTANT MEDIUM DUTY HEAT RESISTANT ELECTRICAL THEMALLY INSULATED CUT RESISTANT BUTCHER GLOVE Global Fire Resistant Cable Market Size, Share, Industry Trends, Growth, Outlook & Analysis 2017-2027 By Insulation Material (Cross-Linked Polyethylene (XLPE), Polyvinyl Chloride (PVC), Low Smoke Zero Halogen (LSZH), Ethylene Propylene Rubber (EPR), and Others); By End-Use Industry (Building & Construction, Manufacturing, Energy, and Others); By Region, Competitive Market Share & Forecast Principle Of MD. Strongly . collision-free. : Can’t find . any pair m. 1. ≠ m. 2. . such that h(m. 1. )=h(m. 2. ) easily. (Sometimes we can settle for weakly collision-free: . given m. , can’t find m’ ≠ m with h(m) = h(m’).. Multiple Access Methods. Multiple Access Methods. When nodes or stations are connected and use a common link (cable or air) , called a multipoint or broadcast link, we need a multiple-access protocol to coordinate access to the link..