hash encryption

PHP gives developers a great deal of flexibility, but this also poses a potential risk to security issues, the recent need to summarize the past problems, here to lend a translation of an article at the same time with their own development of some

1 Find the character position function:Strpos ($str, Search,[int]): Find the first position of search in $str starting with int;Stripos ($str, search,[int]): function returns the position of the first occurrence of a string in another string. This

This article is a technical summary of learning the architecture of large distributed websites. A high-performance, highly available, scalable, extensible distributed Web site is described in the framework, and an architectural reference is given.

On Linux systems, user management is the allocation of resources based on user name and password, and the users on Linux are divided into the following categories:admin: Root UID 0Normal Users: 1-65535System User: 1-999 permission assignment for the

Detailed user and authority  Users, Groups, permissionsSecurity context (secure contexts);Permissions:R W XFile:R: Readable, you can use similar commands such as cat to view the contents of the file;W: writable, can edit or delete this file;X:

Software Installation1. Identification of software namesRPM at the end of the application for the Redhat operating system, there are two ways to install, directly open the installation package and install with the command, the following important

①cd:change DirectoryCD: The home directory is returned by default without any parameters.CD ~username: Enter the home directory of the specified userCD-: Switch back and forth between the current directory and the previous directoryIi<> must choose[]

1 User Profiles1.1 User Information file /etc/passwdView Help man 5 passwd--Account:password:UID:GID:GECOS:directory:shell-account User name Notice specification-PASSWD password flag x indicates password specific password in shadow-uid user ID 0:

Phenomenon:[email protected] yum.repos.d]# Yum Clean allCleaning up everything[email protected] yum.repos.d]# Yum MakecacheBase 100% |=========================| 3.7 KB 00:009a3a8909e656c27cd85c75a2d 100% |=========================| 4.6 MB 00:02http:/

Some people say that security is not a product, but a process. While the SSH protocol is designed to be secure with encryption , if used improperly, others can disrupt your system: such as weak passwords, key leaks, using outdated SSH clients, and

Summary of the first five sectionsIn the previous section, we learned about some of the basics of Linux systems, including Linux system installation, network configuration, Putty remote connections and Yum sources, as well as a brief description of

Each application runs a copy of the library from memory, so this library is called a shared library. All files on Linux, which have access to these files on Linux, are controlled by permissions.Linux uses three types of users to achieve the control

Remember before the test soft test and recent exams, always appear the problem of encryption algorithm, summed up here.Summary of symmetric and asymmetric and reversible non-reversible cryptographic algorithms:According to the different key types,

Linux Notes General section SummaryShell; child shellBash--bashBash1. Command history, Command completion2, Pipeline, redirect3. Command aliases4. Command line editing5. Command line expansion6. File name Wildcard7. Variables8.

User: identifierUser groups: IdentifiersFile:Processes also have group and ownerSecurity contexts (Secure context)/tmp/inita Tom TomLs-rw-------root rootbelong to the group of main generaFile:R: Readable to view file contents using commands like

In Linux mainly through user profiles to view and modify user information, so below we will introduce two important user profiles, so that you can better hold your users.One: Parent file/etc/passwd1. View configuration file/etc/passwd specific

7.1. User Configuration file7.2. User Management Related documents7.3. User Management commands7.4. User Group Management CommandDelete user Userdel [[email protected] ~]# Userdel [-r] Username//must add-r, delete home directoryIn addition to

ObjectiveEveryone should know that memcached to achieve distributed only in the client to complete, the current is more popular through the consistent hash algorithm to achieve. The general approach is to balance the hash value of the server with

This article is a PHP in the PKI encryption Technology (OpenSSL) for a detailed analysis of the introduction, the need for a friend reference copy code code as follows: //PKI Encryption//Use PKI encryption to open OpenSSL extensions

A few years ago, I had the opportunity to participate in some interesting projects and to independently complete development, upgrades, refactoring, and the development of new features.This article summarizes some of the key errors that PHP