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Auburn - COMP - 3400
COMP 4300 Computer ArchitectureTechnology TrendDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Technology TrendIn reality:Big Fishes Eating Little Fishes2Technology Trend1988 Computer Food ChainCentralize
Auburn - COMP - 3400
COMP 4300 Computer ArchitecturePerformance MeasurementDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101What is Computer Architecture ?Application (Netscape)SoftwareHardwareOperating SystemCompiler(Unix;As
Auburn - COMP - 3400
COMP 4300 Computer ArchitecturePerformance MeasurementDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Example of Measuring CPU timeCPU timeCPU time= Seconds = Instructions x Cycles x Seconds= Seconds = Inst
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureInstruction SetDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101The Instruction Set (ISA):a Critical InterfaceTheactualprogrammervisibleinstructionsetsoftwareinstructionsethar
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureInstruction Set (cont.)Dr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Operand Locations in Four ISAClassesGPR2Code Sequence C = A + BCodefor Four Instruction SetsforStack
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureInstruction Set (cont.)Dr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Memory-Memory Architectures Instruction set:(3 operands) add A, B, C(2 operands) add A, Bsub A, B, Cmul
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureTypes of InstructionsDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Review: Types of Addressing ModesAddressing Mode1. Register direct2. Immediate3. Displacement4. Register
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureOperations in the Instruction SetDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Review Memory Addressing Types of Instructions2I-Format vs. R-FormatInstructions Compare wit
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureOperations in the Instruction SetDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Comparisons - What about <, <=, >,>=? bne, beq provide equality comparison slt provides magnitu
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureDatapathDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Datapath for BranchInstructionsbeq rs, rt, offsetif (R[rs] = R[rt]) thenPC PC+4 + s_extend(offset<2)oprsrtoffset/im
Auburn - COMP - 3400
COMP 4300 Computer Architecture1. Single-Cycle Datapath2. Control Unit DesignDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Datapath Components for MIPS beqbeq $R1, $R2, -100if $R1=$R2 then PC = PC+4+4*(-10
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureControl Unit StructureDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101ReviewADD04rsrtrdI[25:21] I[20:16] I[15:11]PC1<2InstructionADDRRDInstructionMemoryI325016
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureMulticycle ImplementationDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101The Problem with Single-CycleProcessor Implementation: Performance Performance is limited by the slowest
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureMulticycle ImplementationDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101The slowest instruction.If all instructions must complete within one clock cycle, then the cycle time has
Auburn - COMP - 3400
COMP 4300 Computer ArchitecturePipeline: IntroductionDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Full Multicycle ImplementationZ eroPCWrite CondControlUnitPCWrit eALUOp2ALUControlIRWritefunctop
Auburn - COMP - 3400
COMP 4300 Computer ArchitecturePipeline: SpeedupDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Pipeline example: lwWBCan you find a problem?2Basic Pipelined Processor (lw)3Single-Cycle vs. Pipelined Exec
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureStructural HazardsDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Review: Pipeline Hazards Limits to pipelining: Hazards prevent nextinstruction from executing during itsdesign
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureData HazardsControl HazardsDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Review: Structural Hazards Attempt to use same resource twice at sametime Example: Single Memory for
Auburn - COMP - 3400
COMP 4300 Computer ArchitecturePipeline: Branch PredictionDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Review: Data Hazards Data hazards occur when data isused before it is storedTime (in clock cycles)CC
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureReviewDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Supercomputer Trends in TopSIMDClusterSingle processor 500ConstellationsSMPMPPwww.top500.orgNov. 2004CPUCPUCPUCPU
Auburn - COMP - 3400
COMP 4300 Computer ArchitecturePipeline: ExceptionsDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Exceptions - Stuff Happens Exceptions definition: unexpectedchange in control flow Another form of control h
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureControl for Pipelined DatapathDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Pipelining in MIPS MIPS architecture was designed to bepipelined Simple instruction format (makes
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureInstruction-level parallelism:IntroductionDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Class ExerciseConsider the following code segment1.LW R1, 0(R4)2.LW R2, 0(R5)3.AD
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureLaboratory Assignment 3:Pipelined Datapath with Interlocksand ForwardingDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Introduction From your multi-cycle machine to amachine
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureInstruction-level parallelism:Instruction DependenceDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101ILP Challenges How many instructions can we execute inparallel? Definition
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureControl DependenciesDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Instruction Dependence ExampleFor the following code identify all data and name dependencebetween instruction
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureReview: Control DependenciesDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Review: Preserving the data flow Consider the following example:daddu r1,r2,r3beqz r4,Ldsubu r1,r5,
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureScoreboardDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Typical Scoreboard Structure2 FP multiply, 1 FP adder, 1 FP divider, 1 integer2Using A Scoreboard: 4 stages1.Issue d
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureScoreboard An ExampleDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Scoreboard Example Cycle 1InstructionstatusInstructionjkLDF634+ R2LDF245+ R3MULTDF0F2F4SUBD F8
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureInstruction-level parallelism:TomasuloDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Review: Scoreboard Techniques to deal with data hazards in instructionpipelines by: Resul
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureInstruction-level parallelism:Tomasulo (cont.)Dr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Tomasulos Algorithm Tracks when operands for instructions areavailable. Minimizes
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureTomasulo - A loop exampleDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Tomasulo Loop ExampleLoop: LDMULTDSDSUBIBNEZF0F4F4R1R10R1F0 F20R1R1 #8Loop This time ass
Auburn - COMP - 3400
Memory Hierarchy: IntroductionDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Memory Systems - the BigPicture withMemory provides processor Instructions Data Problem: memory is too slow and too smallProces
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureSet-Associative CacheBlock IdentificationDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Direct-Mapped Cache with n one-wordblocks Pros: find data fast Con: What if access 000
Auburn - COMP - 3400
COMP 4300 Computer ArchitectureReview for Final ExamDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduFall, 20101Final Exam ReviewFocus on materials after the midterm,including Pipeline Exceptions Control for Pipelined
Auburn - COMP - 3400
COMP4300 Computer ArchitectureFall 2010Auburn UniversityInstructor: Dr. Xiao QinStudy Guide for MidtermThe midterm exam will occur on Friday, Oct. 8. This exam is closed book and closed notes. The examis worth 20% of your final grade. Although a cal
Auburn - COMP - 7370
Are Clouds Secure?Security and PrivacyImplications ofCloud ComputingSubra Kumaraswamy, SunTim Mather, RSA04/21/09 | Session ID: HOT-105Session Classification: IntermediateWhat Were Not Going to Discuss Existing aspects of information security whi
Auburn - COMP - 7370
CloudAV: N-Version Antivirus in the Network CloudJon Oberheide, Evan Cooke, Farnam JahanianElectrical Engineering and Computer Science DepartmentUniversity of Michigan, Ann Arbor, MI 48109cfw_jonojono, emcooke, farnam@umich.eduAbstractAntivirus soft
Auburn - COMP - 7370
LestWeRemember:ColdBootAttacksonLestWeRemember:ColdBootAttacksonEncryptionKeysJ.AlexHalderman,SethD.Schoen,NadiaHeninger,WilliamClarkson,WilliamPaul,JosephA.Calandrino,ArielJ.Feldman,JacobAppelbaum,andEdwardW.FeltenInProceedingsofthe2008USENIXSecurit
Auburn - COMP - 7370
Freenet: A Distributed Anonymous InformationStorage and Retrieval SystemIan Clarke1 , Oskar Sandberg2 , Brandon Wiley3 , and Theodore W. Hong414Uprizer, Inc., 1007 Montana Avenue #323, Santa Monica, CA 90403, USAian@octayne.com2Mrbydalen 12, 18252
Auburn - COMP - 7370
COMP 7370Advanced Computer and Network SecurityHomework 2 FeedbackDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduSpring, 201112Goals of Homework 2Homework 2 vs. Paper reviewingHomework 2 vs. Choosing a research probl
Auburn - COMP - 7370
COMP 7370Advanced Computer and Network SecurityHomework 3 FeedbackDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduSpring, 20111Goals of Homework 2/3 Paper reviewing Choosing a research problem2Good Organizations Jame
Auburn - COMP - 7370
L. Sweeney. k-anonymity: a model for protecting privacy. International Journal on Uncertainty,Fuzziness and Knowledge-based Systems, 10 (5), 2002; 557-570.k-ANONYMITY: A MODEL FOR PROTECTING PRIVACY1LATANYA SWEENEYSchool of Computer Science, Carnegie
Auburn - COMP - 7370
Generalizing Data to Provide Anonymity when Disclosing InformationExtended AbstractPierangela SamaratiComputer Science LaboratorySRI InternationalMenlo Park, CA 94025, USAsamarati@csl.sri.comLatanya SweeneyLaboratory for Computer ScienceMassachus
Auburn - COMP - 7370
COMP 7370Advanced Computer and Network SecurityDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduCOMP 7370, Auburn UniversitySlide 01-1Introduce YourselvesNameM.S. or Ph.D. studentYour research interestsYour ongoing res
Auburn - COMP - 7370
COMP7370 Advanced Computer and Network SecurityCold Boot Attacks on Encryption KeysA memory remanence attack aims to obtain memory images and recover cryptographickeys from DRAM after a reset or moving the DRAM to another system.1. Motivation: How to
Auburn - COMP - 7370
COMP 7370Advanced Computer and Network SecurityLec02aDRAM Remanence EffectsDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduSpring, 20111Decay at operating temperature2Decay at operating temperature3Decay at operatin
Auburn - COMP - 7370
COMP7370 Advanced Computer and Network SecurityCold Boot Attacks on Encryption Keys (2)Topics: Imaging Residual MemoryKey reconstructionIdentifying keys in memoryTopic 1: Imaging Residual Memory1. Memory Wiping Can wiping memory at POST (Power-On S
Auburn - COMP - 7370
COMP 7370Advanced Computer and Network SecurityImaging residual memoryKey reconstructionIdentifying keys in memoryDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduSpring, 20111Optimal decoding is 0 if more than nr ofth
Auburn - COMP - 7370
COMP7370 Advanced Computer and Network SecurityCold Boot Attacks on Encryption Keys (3)Topics:1. Identifying keys in memory2. Attacking encrypted disks3. CountermeasuresTopic 1: Identifying keys in memory Question: How will you identify keys in RAM
Auburn - COMP - 7370
COMP7370 Advanced Computer and Network SecurityCold Boot Attacks on Encryption Keys (4)Topics:1. NSF CCLI-TUES11 Conference2. Homework 1, Question 13. CountermeasuresTopic 1: CCLI-TUES11 Conf. About CS conferences/workshop CCLI-TUES11 -> Conf. in
Auburn - COMP - 7370
COMP7370 Advanced Computer and Network SecurityCloudAV: N-Version Antivirus in the Network Cloud (1)Topics:1. Research Tip: How to choose a research topic?2. Security of cloud computingAnnouncement: Homework 1 is due by tonight at 11:55pm.Topic 1: R
Auburn - COMP - 7370
COMP7370 Advanced Computer and Network SecurityTopics:1. Comments on Homework 12. Introduction to Project 1Announcement: Project 1 is due at 11:55pm on March 1st.Topic 1: Comments on Homework 1 No new findings. See slide 2o derived from Table 1 and
Auburn - COMP - 7370
COMP 7370Advanced Computer and Network SecurityComments on Homework 1Dr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduSpring, 20111No New Findings2Uncomparable items3Good presentation?4Better presentation?5Highlig
Auburn - COMP - 7370
COMP7370 Advanced Computer and Network SecurityCloudAV: N-Version Antivirus in the Network Cloud (2)Topics:1. Software as a service (SaaS)2. Security as a ServiceTopic 1: Software as a service (SaaS) Can you give some examples?o Hotmail.o Google d
Auburn - COMP - 7370
COMP7370 Advanced Computer and Network SecurityCloudAV: N-Version Antivirus in the Network Cloud (3)Topics:1. Motivations2. Basic IdeasTopic 1: Motivations (Limitations) Antivirus softwareo Malicious/unwanted softwareo $10 billion dollars (2008)o
Auburn - COMP - 7370
COMP 7370Advanced Computer and Network SecurityCloudAV: N-Version Antivirus inthe Network CloudDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduSpring, 20111Vulnerability Window2Vulnerability Window (cont.)3Antivirus
Auburn - COMP - 7370
COMP7370 Advanced Computer and Network SecurityAnnouncement: midterm exam March 3rd, 2011.CloudAV: N-Version Antivirus in the Network Cloud (4)Topics:1. Architecture and Design Issues2. Evaluation (not covered, next time)Topic 1: Architecture Basic
Auburn - COMP - 7370
COMP 7370Advanced Computer and Network SecurityCloudAV: N-Version Antivirus inthe Network CloudDr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduSpring, 20111Implementation2Dashboard3Executable Launches4Executable L
Auburn - COMP - 7370
COMP 7370Advanced Computer and Network SecurityComments on Project 1Dr. Xiao QinAuburn Universityhttp:/www.eng.auburn.edu/~xqinxqin@auburn.eduSpring, 2011123456Good Scripts Well document Readability is good Considers many cases7The Best