information system security notes

20145216 20145330 "Fundamentals of Information Security system design" a familiar experimental report cover for the Experimental development environmentExperimental content1. Connecting the ARM Development Board2. Build HyperTerminal3. Start the experimental platform4. Modify the IP of the XP system and the Redhat virt

20145239 "Information Security system Design Fundamentals" The 7th Week study summary textbook Learning content Summary6.1 Storage Technology6.1.1 Random access memory (divided into two categories)Static RAM (SRAM): Fast, as cache memory. (hundreds of thousands of MB)Dynamic RAM (DRAM): As main memory, the frame buffer of the graphics

exception. The typical errors are:scanf("%d",val); (2) Read uninitialized memory Although the bass memory location is always initialized to 0 by the loader, it is not the case for heap storage. A common mistake is to assume that the heap memory is initialized to 0. (3) Allow stack buffer overflow If a program writes to the target buffer in the stack without checking the size of the input string, the program will have a buffer overflow error. (4) Assume t

. Garbage collectionvoid Garbage (){int *p = (int *) Malloc (15213)Return}garbage collector:is a dynamic storage allocator that automatically frees allocated blocks that are no longer needed by the program. These blocks are called garbage. The process of automatically reclaiming heap storage is called garbage collection. The following functions are used in the description of Marksweep: where PTR is defined as typedef void *PTRPtrisptr (PTR p): if p points to a word in an allocated block, it ret

20145222 Summary of the sixth week of information security system design (1) Chapter 4 processor architecture Command architecture: Byte encoding of commands and commands supported by a processor4.1y86 instruction set architecture · Y86: includes defining various state elements, instruction sets and Their encoding, a set of programming specifications, and excepti

2018-2019 20165227 "Information Security system Design Fundamentals" The third week to learn to summarize learning objectives Understanding the concept of reverse Master X86 compilation base, able to read (reverse) Assembly code Understanding ISA (Instruction set architecture) Understand the concept of function call stack frames and can debug

-2018-2019-1 20165206 "basis of information security system design" weekly learning Summary-textbook learning content Summary-hexadecimal conversion and bitwise calculation: Converts a hexadecimal parameter to a binary representation and performs binary operations. And, or, not, or, in bitwise operations, corresponds to , |, ~ in C ,~ ^-Logical operation: Only 0

Beijing Institute of Electronic Technology (BESTI)Lab ReportCourse: Information Security design System Basic class: 1352Name: Huang Wanzihui No.: 20135227 20135214Score: Instructor: Lou Jia Peng Experimental Date: 2015.11.24Experiment level: Preview degree: Experiment time: 15:30~18:00Instrument Group: Compulsory/Elective: compulsory test number: 03Experiment nam

Beijing Institute of Electronic Technology (BESTI)Real Inspection report Course: Information Security system Design Basic class: 1352Name: Wang Gui ChingStudy No.: 20135207 20135238Score: Instructor: Lou Jia Peng Experimental Date: 2015.11.17Experimental classification: No preview degree: Experimental time: 15:30-17:30Instrument Group: 7 Compulsory/elective:

Beijing Institute of Electronic Technology (BESTI)Real Inspection report Course: Information Security design System Basic class: 1352Name: Wanzihui HuangStudy No.: 20135214 20135227Score: Instructor: Lou Jia Peng Experimental Date: 2015.11.16Experiment level: Preview degree: Experiment time: 15:30~18:00Instrument Group: 01 Compulsory/Elective: Compulsory expe

Beijing Institute of Electronic Technology (BESTI)Real Inspection report Course: Information Security system Design Basic class: 1352 Name: LussonStudy number: 20135229 20135234 score: Instructor: Lou Jia Peng Experimental Date:: 2015.11.10Experiment level: Preview degree: Experiment time: 15:30-17:30Instrument Group: Compulsory/Elective: compulsory test numb

folder4. Modify Makefile5. Run make to generate the executable file httpd6. Use the NFS service mode to download the HTTPD to the Development Board and copy the test page for debugging, in this case the index test page.1. The understanding of the experiment process, the understanding of the knowledge point in the experiment instruction book.(1). Signal () functionSignal (SIGHUP, sig_ign);Signal signal function, the first parameter represents the signal value to be processed (SIGHUP), the second

Beijing Institute of Electronic Technology (besti) Lab ReportCourse: Information Security system Design Basic class: 1352Name: Ellis, Jing Mengxin No.: 20135210 20135218Score: Instructor: Lou Jia Peng Experimental Date: 2015.11.17Experiment level: Preview degree: Experiment time:30-18:xx Instrument Group: Compulsory / elective: Compulsory test number: 5 Experim

Beijing Institute of Electronic Technology (BESTI)Real Inspection report Course: Information Security system Design class: 1352Name: Matchianglussong No.: 20135234 20135229Score: Instructor: Lou Jia Peng Experimental Date: 2015.11Experiment level: Preview degree: Experiment time: 15:30-17:00Instrument Group: Compulsory/Elective: compulsory test number: 05Expe

, such as read, are stopped in the Read function, and so on, the Read function is finished, in fact, the control is no longer in main, but through the read function to jump to the kernel. Also such as the signal, the process receives the signal, the trigger control jumps to the signal processing program.This is also true of the non-local jump that is now spoken. The control jumped away. The user-level exception control flow form, called a non-local jump, transfers control directly from one

)That is, the number is rounded up or down, and the lowest valid number of the result is even.Can be used in binary decimals.2. Rounding to 0That is, rounding down integers and negative numbers rounded up.3. Rounding DownBoth positive and negative numbers are rounded down.4. Rounding upBoth positive and negative numbers are rounded up.Iv. floating-point arithmetic 1. floating-point addition Floating-point addition is exchangeable Floating point addition not binding The floating-

# Summary of "Fundamentals of Information Security system Design" courseNo. 0 Week SummaryBrief content:Using the virtual machine VirtualBox successfully installed Linux system, preview the Linux basic primer, read Lou teacher recommended blog Impressions.Two-dimensional code:1th Week SummaryBrief content:Introduced Li

20145336 Zhang Ziyang "The foundation of Information Security system Design" 9th Week Study Summary Learning goal Mastering the concepts of system programming and system invocation Mastering the way of system programm

); Functions for reading and writing strings (Fgets and Fputs) Flow application: A stream is a pointer to a structure of type file (for example, every Asni C file opens, it will open stdin,stdout,stderr three streams at the same time). Meaning: A stream is an abstraction of a file descriptor and a stream buffer. (The purpose of the stream buffer is similar to Rio, which is to reduce the number of expensive UNIX system calls)

descriptor table entry OLDFD to the Descriptor table entry NEWFD, overwriting the previous contents of the Descriptor Sheet table entry newfd. If the NEWFD is already open, Dup2 will close NEWFD before copying the OLDFD.#include int dup2(int oldfd,int newfd);8 Standard I/OThe standard I/O library models an open file as a stream, which is a pointer to the structure of the file type.#include *stdin; /*标准输入，文件描述符为0*/extern FILE *stdout; /*标准输出，文件描述符为1*/extern FILE *stderr; /*标准错误，文件描述符为2*/A strea