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]/]# chattr-i/etc/group[Email protected]/]# chattr-i/etc/gshadow[Email protected] ~]# Lsattr/etc/group/etc/passwd/etc/shadow/etc/gshadow————-e-/etc/group————-e-/etc/passwd————-e-/etc/shadow————-e-/etc/gshadowChange the permissions and then modify the file can, after the modification, then execute.[Email protected]/]# chattr +i/etc/passwd[Email protected]/]# chattr +i/etc/shadow[Email protected]/]# chattr +i/etc/group[Email protected]/]# chattr +i/etc/gshadowReprint: http://www.80uncle.com/linux%
Anti-leech protection for imagesImageAnti-DDoSLeeching(This image is from the public platform and cannot be consumed without permission) (no source is found. If any infringement occurs, please inform us in time. Thank you) Because the image referenced in the label 1234567891011 imgsrc="http://mmbiz.qpic.cn/mmbiz/CoJreiaicGKekEsuheJJ7Xh53AFe1BJKibyaQzsFiaxfHHdYibsHzfnicbcsj6yBmtYoJXxia9tFufsPxyn48UxiaccaAA/640?wx_fmt=jpegamp;wxfrom=5a
SYN Attack Protection and syn ProtectionSYN Attack Response The following solutions are provided for SYN Attacks: Method 1: Reduce the number of retransmissions of SYN-ACK packets (5 by default ):Sysctl-w net. ipv4.tcp _ synack_retries = 3Sysctl-w net. ipv4.tcp _ syn_retries = 3 Method 2: Use SYN Cookie technology:Sysctl-w net. ipv4.tcp _ syncookies = 1 Method 3: Add a backlog Queue (default value: 1024 ):Sysctl-w net. ipv4.tcp _ max_syn_backlog =
Repeated submission of web Front-end protection and repeated submission of web ProtectionPrevent repeated submission in front-end web development Web Front-end data requests or forms are often submitted through dom click events, but often because they think that clicking too quickly (a young man is very fast ), or, because of the user's waiting for response, the user repeatedly clicks without human operation, resulting in the continuous and repeated s
Copyright law protects the limitations of computer software (i) Copyright law protects the mainstream of computer software in the late 80, many countries, led by the United States, began to amend copyright law to incorporate computer software into the protection object of copyright law. In the December 1980, the United States amended the Copyright law, formally confirmed that the computer software as a general writing works of copyright law
1 Development Status of relay protection The rapid development of power systems puts forward new requirements for relay protection. The rapid development of electronic technology, computer technology and communication technology has continuously injected new vigor into the development of relay protection technology, therefore, the relay
Integrated wiring system is a part of intelligent building, compared with the traditional cabling, its main features are compatibility, openness, flexibility, reliability, advanced and economical, it can make voice, data, image equipment and exchange equipment and other information management system connected, also can make these devices and external communication network connection. It can be said that the integrated wiring system is like an intelligent building of a highway, with this informat
Word document protection can be said to be from word 971 until word XP is the same old, there is no significant change, some users even disdain it. However, Word 2003 's "Protect Document" feature has been significantly improved, with the exception of previous versions of revision protection, annotation protection, and form p
Three-stage current protectionThree-stage fixed time overcurrent protection each section action current fixed value and the action time fixed value can be independently set, each section overcurrent protection uses the same action discrimination logic, the action export condition is: For the nth segment of the current set value Three-stage protection
Requirements for document protection downloads If we need to sell digital forms of goods on the site, such as electronic books, digital oil painting, and so on, how to prevent unauthorized users from illegally downloading your product while it is available for authorized users to download normally? Through forms authentication, this problem can only be partially resolved. In this article, I'll explain how to prevent some users from accessing certain
The EU General Data Protection regulations (Protection REGULATION,GDPR) will be formally implemented on May 25, 2018, although it aims to strengthen the protection of relevant residents and individual information and privacy data in the EU, but from the information industry as a whole , is a historic breakthrough. Europe has come to the forefront of the world aga
Self-protection backgroundThe first thing to know about the Eureka Registry is that eureka each node is equal, without the concept of a role in ZK, even if n-1 nodes are hung up, it will not affect the normal operation of the other nodes.By default, if Eureka server does not receive a heartbeat for a microservices instance within a certain amount of time (by default, 90 seconds), Eureka server will remove the instance. However, when the network partit
Today's anti-virus software is a variety of, however, can be trusted by users or only a few. At present, Tencent Computer Butler according to the current network security situation, tailored to the user four sets of system protection system, which users can open real-time protection. Then, the following and small set together to see Tencent computer Butler Real-time Pro
its own task_struct on a waiting queue, such as wait_queue_t. and set its own state to interrputable or uninterrutable (allowing the signal to wake up or not), and finally call schedule. In this case, the execution of schedule will remove the current Task_struct from the running queue where it resides.The schedule is not to remove the current Task_struct from the running queue where it is scheduled to be re-dispatched or all steals.The re-Dispatch is divided into two steps:1. Set the current ru
The installation of the operating system is a very cumbersome thing, the normal way to install usually requires nearly one hours. At present, the personal operating system is also the majority of Windows, a little computer experience friends have found that the Windows system after the use of a period of time will be slow, and there is instability. To solve this problem, many manufacturers have introduced related products, such as the famous backup and restore software Ghost, hardware restore c
Data protection technology DRM has become one of the fastest developing information security technologies in the 2007. Recently, companies led by Microsoft have issued new standards for relevant technologies. On the contrary, in the United States hackers Congress, has been the corresponding crack standards, an attack on the user's impact can not be overlooked. The birth of new technology The birth of data protec
The general cause of this phenomenon may be your u disk has a bad block or expansion of the U disk, your USB drive may be a cottage expansion upgrade, even with the flash chip may be black, if you want to use the normal, you must use your U disk Master control model corresponding to the U disc volume production tools for mass production operations, Let the mass production tool pick out the bad blocks to restore the available portions of your USB flash drive. Specific operations, please refer to
Source: Lithium Battery Protection Board basic knowledgeFirst, the origin of the protection plateLithium-ion batteries (rechargeable) need to be protected, it is determined by its own characteristics. As the material of the lithium battery itself determines that it can not be overcharge, over-discharge, over-current, short-circuit and ultra-high temperature charge and discharge, lithium battery components w
Interrupt Descriptor Descriptor Register instruction: SIDT DSTSimilar to "Sgdt DST".b) Storage machine status word directive: SMSW DSTDST can be a 16-bit universal register or storage unit. No effect on the flag bit.Note: In order to be compatible with the 80286 instruction set (386 CR0 low byte equals 286 machine state word), in 386, the storage machine word should use the stored CR0 Register instruction.2) Real mode and privilege level 0 executable commandsKey register settings directives, et
When I learned about embedded systems, I thought about the startup process of the system on the development board. I thought about the Startup Process of the Windows system. When I looked for information about the startup process, I said that the Boot Sector is running in the real mode, then ntldr was running in the protection mode and suddenly found that I forgot about the two modes, so I found some information. The 80386 processor has three working
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