CS306: Introduction to IT Security Fall 2020 Lecture 2: Symmetric-key Encryption Instructor: Nikos Triandopoulos September 8, 2020 2 2.0 Announcements CS306: Staff u Instructor u Nikos Triandopoulos, ntriando@stevens.edu u course organization / management, lectures, assignments, grades, … u all mistakes will be also mineJ u office hours: Thursdays 1 – 2pm (Zoom ID 91463728672) or […]
CS306: Introduction to IT Security Fall 2020 Lecture 1: Introduction Instructor: Nikos Triandopoulos September 1, 2020 Today u Course logistics u Introduction to the field of IT security u in-class discussion with a real-world example 2 3 1.1 Course logistics CS306: Topic of study “Introduction to IT Security” u “IT” = Information Technology u the
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DATABASE SYSTEMS Design, Implementation, and Management 12e Carlos Coronel | Steven Morris Australia • Brazil • Mexico • Singapore • United Kingdom • United States Copyright 2017 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed
Problems with Semaphores • Used for 2 independent purposes – Mutual exclusion – Condition synchronization • Hard to get right – Small mistake easily leads to deadlock May want to separate mutual exclusion, condition synchronization Monitors (Hoare) • Abstract Data Type – a class (as are locks and semaphores) – 3 key differences from a
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• Parallelizing Programs • Goal: speed up programs using multiple processors/cores 2 When is speedup important? • Applications can finish sooner – Search engines – High-res graphics – Weather prediction – Nuclear reactions – Bioinformatics Types of parallel machines • General purpose – GPU – Shared-memory multiprocessor (“multicore”) – Distributed-memory multicomputer • SIMD: single instruction,
Message Passing • Different from shared memory programming – no shared memory – can’t use simple semaphores, condition vars – can’t use shared buffers, producer/consumer • Communication based on message passing – Process A on machine 1 sends message to process B on machine 2 (over the network) – How does it get there? [we
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Dimensionality Reduction with Principal Component Analysis Liang Zheng Australian National University liang.zheng@anu.edu.au Meta Sim: Learning to Generate Synthetic Datasets. Kar et al., ICCV 2019 Idea of PCA area House price (million) House area (100m2) a 10 10 b 2 2 c 7 7 d 1 1 e 5 5 price We subtract means from data
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Linear Regression Liang Zheng Australian National University liang.zheng@anu.edu.au Analyzing Worldwide Social Distancing through Large-Scale Computer Vision, Ghodgaonkar et al., Arxiv 2020 Live data stream crawling 30,261 discovered cameras distributed by geographic location A park in Schwarzsee, Switzerland, on May 22, 2020 Vehicle count Vehicle count Regression problem • Regression is a fundamental problem in machine
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The Memory Hierarchy 1 Random-Access Memory (RAM) Key features RAM comes in two varieties: RAM is traditionally packaged as a chip. Basic storage unit is normally a cell (one bit per cell). Multiple RAM chips form a memory. SRAM (Static RAM) DRAM (Dynamic RAM) 2 SRAM vs DRAM
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12 November 2015 Term Test # 2 — Sample Solutions CSC 373 H1 Note to Students: This file contains sample solutions to the term test together with the marking scheme and comments for each question. Please read the solutions and the marking schemes and comments carefully. Make sure that you understand why the solutions given