best way to study for security exam

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

also have access rights division. Instead of adding a if-else when you want to access the data inside the code, it should be blocked out before the call has started.Second, a program that must be networked to use, why not data access, core business logic is placed on the remote server, exposing the interface to the client call it? There is only one reason why the programmer is too lazy. I am the WinForm, you want me to do what service side, not! Even the basic hierarchy and service division are

Information Security system design basics first week study summaryI. Introduction to the History of experiments1. Knowledge points1) Operating system: Connect hardware and applications as a bridge between the computer tables, including system calls and cores.2) Linux: Developed by the first, the original purpose isCompared to Windows, the main advantages (and some people's serious disadvantage) are-mostly o

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 address of Pa. The address of the first byte is 0, the next byte has an address of 1, the next

and the number of cylinders in a disk is generally the same relationship? Because in the exercise, they are replaced directly with each other.Problem two, the simple way to estimate disk access time is to take the seek time by 2, but in exercise 6.3, so that the results of 16ms and the actual result 10ms difference is very large?Harvest and experience:This time the homework is completed the longest time, spent three days, finally read the book carefu

2018-2019-1 20165210 "Information Security system Design Fundamentals" 4th Week study summary Textbook Learning content Summary ISA Concept: The byte-level encoding of a processor-supported instruction and instruction is called its instruction set architecture Isa.While the processor performance and complexity of each manufacturer is increasing, the different models remain compatible at the IS

Information Security System Design Foundation 14th Week study Summary"Learning Time: 5 hours""Learning content: The Nineth chapter--Virtual Memory"I. Textbook content carding 1. Virtual memory Role: The main memory is considered as a cache of the address space stored on disk, only the active area is protected in main memory, and the data is transmitted back and forth between the disk and mai

/dumgeewang/article/details/7741033 define function int fstat (int fildes,struct stat * BUF), which is used to copy the state of the file referred to by the parameter fildes to the structure referred to in the parameter buf (struct stat). Mmap: Requires the kernel to create a new virtual storage area and map a contiguous slice of the object that the file descriptor FD refers to in this region "Description:"In this way, the idea of a function is un

20145331 "The basis of information security system Design" 9th Week Study Summary Textbook learning Contents 10.1 Unix I/OAll I/O devices in Unix are modeled as files, and all inputs and outputs are executed as read and write to the corresponding file.10.2 Open Close File1. Open File:int open(char *filename, int flags,mode_t mode);Where the first parameter in parentheses is a file name, the second parameter

) 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

20165230 2018-2019-1 "Information Security system Design Fundamentals" The second week study summary of learning Contents There are two general rules for arranging the bytes of an object: The small-end method (least significant byte at the front) and the big-endian (the most significant byte in front). The expression x>>k will shift the X arithmetic right to K (the left side complements the K-effectiv

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 programming error handling Mastering Unix/linux System level I/o:open Close Read Write seek stat Mastering Rio Mastering the method

Representation and processing of informationFirst, GCC compilationWhen using the C99 feature, the GCC-STD=C99 XXX.C Lab building environment is 64 bits, compiled to 32-bit machine code: Gcc-m32 xxx.cSecond, the textbook guideThree types of numbers:unsigned (unsigned) encoding is based on the traditional binary notation, which represents a number greater than or equal to zero.The complement (s-complement) encoding is the most common way to represent si

functions:ptr定义为typedef void *ptr PTR isptr (PTR p): if p points to a word in an allocated block, it returns a pointer B to the starting position of the block, otherwise returns null int blockmarked (PTR b): Returns TRUE if Block B is already marked int blockallocated (PTR b): If block B is allocated, then long returns ture void Markblock (PTR b): Tag block B int length (PTR b): Returns the length in words of block B, excluding the head void Unmarkblock (PTR b): Cha

; 863dae13577340b98c4c247f4a05b204a3543248a12345678;3dd635a808ddb6dd4b6731f7c409d53dd4b14df2Note: The above weak password has been SHA1 encryption, original and ciphertext with "; the splitpassword using one-way encryption algorithm or MD5 as much as possible9.3multi-factor authenticationIn addition to the general password, dynamic password, digital certificate, U- Shield, third-party certificates, etc. are available for user authentication. These dif

First, website attack and defense Attack: 1. XSS attack: Dangerous character escapes, HttpOnly 2. Injection attack: Parameter binding 3, CSRF (cross-site request forgery): Token, verification code, Referer Check 4. Other vulnerability attacks Error Code HTML annotations File Upload Path traversal Defense: 1. Web Application firewall: modsecurity 2. Website security vulnerability Scan

double. On machines that support IEEE floating-point format, these data types correspond to single-precision and double-precision floating-point.The newer version of the C language, including the ISO C99, contains the third floating-point data type long double. For many machines and compilers, this data type is equivalent to a double data type. However, for Intel compatible machines, GCC uses the 80-bit "extended precision" format to implement this data type, providing a much larger range and p

The representation and processing of the information in the 2nd Chapter(i), three kinds of important digital representationsUnsigned number: The encoding is based on the traditional binary notation (numbers greater than or equal to zero).Complement: Encoding is the most common way to represent signed integers (numbers that are positive or negative).Floating-point number: The encoding is a two-base version of the scientific notation for real numbers.Al

specified as a double word, the size of the block is the integer multiple of the double word, not the rounding to Yes.Explicit idle linked list Difference（1）分配时间 隐式的，分配时间是块总数的线性时间 但是显式的，是空闲块数量的线性时间。（2）链表形式 隐式——隐式空闲链表 显式——双向链表，有前驱和后继，比头部脚部好使 Sorting policy:?后进先出?按照地址顺序维护Detached List of idle links Separating storage is a popular way to reduce allocation time. The general idea is to divide all possible block sizes into equivalent clas

Web site is not uncommon, although using stored procedures can improve execution efficiency. However, there are migration problems.database characters need to be uniformly encoded, preferably for UTF-87.3defend correctlySqlinjectedDefense methods:q using pre-compiled statementsq Using Stored Proceduresq Check Data typeq using Security Functions7.4Other injection attacksXML injectedXML injection is implemented by rewriting the XML's data cont