information system security notes

selection: determine where the desired word starts in the block. Associated High-speed cache:1. group selection in group-connected high-speed cache: Same as group selection in direct ing high-speed cache, group index bit Identification Group.2. Row matching and word selection in the group-connected high-speed cache: each group is considered as a small memory associated with a (Key, value) pair array,3. Input key to return the value in the corresponding array. The cache must search for each row

layer and find it in the cache content at the K layer. You can directly read data at the K layer, which is called cache hit. Cache miss. No data is found at the K layer. The cache at the K layer needs to retrieve the block containing objects from the cache at the K + 1 layer. If the K layer is full, overwrite an existing block. Cool hit, the K layer has nothing, so it does not hit. High-speed cache memory, mainly the size (p426) and probability (p431)Summary of test errors last week 2018-201

Beijing Institute of Electronic Technology (BESTI)Real Inspection report Course: Information Security system Design Basic experiment class: 1353School Number name: 20135305 Liao 20135310 Chen ChaojanScore: Instructor: Lou Jia Peng Experimental Date: 2015.11.17Experiment level: Preview degree: Experiment time: 15:30-18:30Instrument Group: Compulsory/Elective:

solutionissue: After you open HyperTerminal, The information on the arm machine is never displayed in the HyperTerminal window. solution: Found the reason, is the serial cable connected to the wrong location, should not be connected to 1, after replacing 0 , HyperTerminal will show normal. (2)IP problems and Solutionsproblem: Need to put the lab box, virtual machine the IP of Redhat,WinXP is set to the same network segment. FIX: First look at the lab

20145306 "Fundamentals of Information Security system Design" 14th Week study summary textbook Learning content Summary physical and virtual addressingPhysical addressing: The main memory of a computer system is organized into an array of cells consisting of m contiguous byte sizes. Each byte has a unique physical addr

Summary of information security system design------------------------------------------------GCC parameters:-o:output, used to specify the file name to generate an executable file-C: Used to generate a target file (. o) from the source file and prevent the compiler from creating a complete program-I: Increase the path of the search header file at compile time-L:

form of ' command ' {} \; Note the space between {} and \; OK: the same function as-exec, except that the shell command given by this parameter is executed in a more secure mode, and before each command is executed, a prompt is given to let the user determine whether to execute Common options: -name: Find files by file name -perm: Find files according to file permissions Mtime-n +n: Finds files according to file change time,-n means file change time is less t

20145221 high its 20145326 Cai "the foundation of Information security system Design" experimental two firmware design experiment purpose and requirements Learn the basic principles of multi-threaded programming and learn the use of Pthread library functions. Understand the basic methods of serial programming in Linux environment. Master the main

2018-2019-1 20165306 "Information Security System Design Basics" week 5 study summary teaching material Learning Content summary 6.1 storage technology 6.1.1 random access storage Static RAM (SRAM): A bi-stable feature that maintains its value as long as it has electricity. Even if there is interference to disturb the voltage, when the interference is eliminate

after setting is complete.5. Installing the ARM compilerAccess the shared folder through the PC and copy the compiler to the shared folder so that the virtual machine can also be accessed. Install the extracted files.6. Configure Environment variablesUse VI in the virtual machine to modify the PATH variable in the/root/.bash_profile file to path=path:home/bin:/opt/host/armv4l/bin/, after disk execution: Source/root/.bash_ Profile, the armv4l-unknown-linux-gcc will be automatically searched late

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 blockFive, Deadlock:A set of threads is blocked, waiting for a condition that will never be true.How to resolve a deadlockA. Do not allow deadlocks to occur:B. Let the deadlock occur:Resources:1. Teaching Materials: 11th chapter "Network Programming"2. Teaching Materials: 12th chapter "Concurrent Programming"20135223 He Weizin

Eighth. Abnormal control Flow1, from the power supply to the processor to start, until the location, the program counter assumes a sequence of values: A0,a1,..., an-1, where each AK is an address corresponding to the instruction IK. Each transition from AK to ak+1 is called control transfer. Such a control transfer sequence is called the control flow of the processor. The simplest type of control flow is a "smooth" sequence in which each IK and ik+1 is contiguous in memory.2. The

between the WEB client and the server is a text-based application-level protocol called HTTP (hypertext Transfer Protocol, Hypertext Transfer Protocol). HTTP is a simple protocol. A WEB client (that is, a browser) opens an Internet connection to the server and requests some content. The server responds to the requested content, and then closes the connection. The browser reads the content and displays it on the screen.2. Web ContentEach content returned by the WEB server is associated with a fi

20145317 "Information Security system Design Fundamentals" 9th Week Study Summary 1Summary of learning contents of textbook 10.1 Unix I/O A UNIX file is a sequence of M bytes (b0b1b2 ... BM-1). All IO devices, such as networks, disks, and terminals, are modeled as files, and all inputs and outputs are executed as read and write to the corresponding file.

Beijing Institute of Electronic Technology (BESTI)Real Inspection report Course: Information Security system Design Basic class: 1352 classesName: (by contribution size) Malmqvist, Yi Silam, Silver snow PureNumber: (Ranked by contribution size) 20135235, 20135239, 20125221Score: Instructor: Lou Jia Peng Experimental Date: 2015.12.1Experiment level: Preview de

operations until all of the request data is delivered. The UNIX kernel uses three related data structures to represent an open file. The table entries in the Descriptor table point to the table entries in the open file, and the table entries in the Open File table point to the table entries in the V-node table, each process has its own separate descriptor table, and all processes share the same open and V-node tables. Understanding the general composition of these structures allows us to c

2018-2019-1 20165230 "Fundamentals of Information Security system design" The third week study summary of learning Contents The actual implementation of the memory system is to combine multiple hardware memory and operating system software. How valid addresses a

Pthread_join to release resources also helps to avoid excessive memory congestion For the Pthread_join () function, I think the difficulty is mainly the second parameter, it is a two-level pointer variable, in order to better understand the pthread_join () function of the second parameter, you can use the following example (the code function is to add the two parameters of the incoming child thread) #include The results of the operation are as follows: Similarly, if you want t

shift x>>k: Move the K-bit right and the value at the left to complement K's most significant bit Logical right Shift x>>>k: Move K-bit right, left complement K 0 Use arithmetic right shift for signed number, logical right shift for unsigned numberInteger representation Information = bit + context unsigned integer: b2u4[0011]=0 2^3+0 2^2+1 2^1+1 2^0=3 Signed integer-complement code: B2t4[1011]=-1 2^3+0 2^2+1 2^1+1 2^0=-5 Uns

where the contents of the disk sector should be stored. The logical block number translates a sector address and then transfers the content to main memory without CPU interference, a process known as direct memory access. This data transfer is called DMA transfer. When the volume of a disk sector is securely stored in main memory, the disk controller notifies the CPU by sending an interrupt signal to the CPU. Problem:may be a bit low-level, the book says that the main me