information system security notes

s=2^s cache groups, each containing an e cache line, each row consists of a b=2^b byte block, a valid bit (indicating whether the row contains valid information), t=m-(B+s) Tag bits, which uniquely identify blocks stored in this cache line The cache determines whether a request is hit and then jerks the process of the requested word, divided into: Group selection, line matching, word extraction Group selection: Extracts the group i

unsigned number to a larger data type, representing the beginning plus 0.Symbol extension-Converts a complement number to a larger data type.Three, integer arithmeticUnsigned number additionAn arithmetic operation overflow that indicates that a complete integer result cannot be placed into the word length limit of the data type.Multiply Constants either unsigned or complement operations, multiplying by a power of 2 results in overflow. Four, floating point numberWhen a number cannot be accurate

Information Security System Design Foundation Fourth Week study summaryLearning tasks: Textbook Chapter IIIDuration of study: 10 hoursLearning content First, the textbook knowledge carding1. Program coding and machine-level code　　Program Code :gcc compiler, converting source code into executable code, c preprocessor-assembler-linker　　machine-Level code :The

2018-2019-1 20165336 "Information Security System Design Basics" week 5th Study Summary 1. learned knowledge points SRAM and DRAM are both easy to lose, but they have different structures, different speeds, and faster access speed. The prom can only be programmed once. Programs stored in ROM devices are usually called firmware. The EEPROM can era

20145321 "The basis of information security system Design" 7th Week study summary textbook study content summary sixth chapterA memory system is a hierarchical structure of storage devices with different capacities, costs, and access times.6.1 Storage TechnologyThree common storage technologies: ram/rom/disk(1) Random

20145235 "Fundamentals of Information Security system design" NO. 06 Week study summary _014.1.4 Y86 anomalySome values for the visible status Code stat:1:AOK program performs normally2:HLT indicates that the processor executed a halt instruction3:adr means that the processor reads from an illegal memory address or writes to an illegal memory address.4:ins indica

-20165206 2018-2019-1 Summary of the fifth week of information security system design-Summary of Teaching Materials-Random Access to memory: Random Access Memory is divided into two types: static RAM (SRAM) and dynamic RAM (Dram ). Static RAM stores each bit in a bistability memory unit, and dynamic RAM stores each bit to charge a capacitor. Static Ram is mai

particular trajectory through the execution state space, forgetting a guideline that the threaded program must work correctly for any viable trajectory.2. Elimination Method:Dynamically assigns a separate block to each integer ID, and passes to the thread routine a pointer to the block4. Deadlock1. A set of threads is blocked, waiting for a condition that will never be true. Programmers use P and V to operate improperly so that the forbidden areas of two semaphores overlap. Overlap

group Send a signal using the/bin/kill program Send a signal from the keyboard Send a signal using the Kill function Send a signal with the alarm function (3) Receiving signalEach signal type has a pre-defined default behavior Process termination Process termination and dump memory Process stops until the Sigcont signal is restarted Process ignores this signal (4) Signal processing problems Pending signal is blocked Pending signals are

are stored as contiguous sequence of bytes, with the address of the object being the smallest address in the byte being used.Linux 32, Windows, and Sun machines use 4-byte addresses, while Linux 64 uses 8-byte addresses.The ASCII code for the decimal digit x is exactly 0x3x, and the hexadecimal representation of the terminating byte is 0x00. Any system that uses ASCII code as a character code will get the same result, regardless of the byte order and

128 pages of reference books4. Translation Conditions BranchThe most common method of translating conditional expressions and statements from C to machine code combines conditional and unconditional jumps 5. Circulationthe assembly cycle can be combined with conditional tests and jumps to achieve6. Conditional Delivery InstructionsThe traditional way to implement conditional operations is to take advantage of controlled conditional shifts. Control transfer of actual use of datathe code that is

) or positive (s=0), and the sign bit with the value 0 is interpreted as a special case.Mantissa: M is a binary decimal order: E is weighted against floating-point numbers and can be negativeFloat:s=1 bit, exp=8 bit, frac=23 bitDouble:s=1 bit, exp=11 bit, frac=52 bit2. Integers and floating-point numbers indicate the relationship of the same number:P74: The relative region corresponds to the low of the integer, just before the highest significant bit equal to one stop, and a floating point repre