Question 2: What does the noun explanation of access control mean? A technology that restricts users' access to certain information items or the use of certain control functions according to their identity and a defined group to which they belong. For example, the principle of UniNAC network access control system is based on this technology. System administrators usually use access control to control users' access to network resources such as servers, directories and files.
Access control is a technology that almost all systems (including computer systems and non-computer systems) need to use. Access control is to give a set of methods to identify, organize and manage all the functions in the system, organize to identify and manage all the data, and then provide a simple and unique interface. One end of the interface is the application system, and the other end is the permission engine. The permission engine only answers: Who has permission to perform operations (move, calculate) on resources? The only results returned are: Yes, No, the permission engine is abnormal.
Chinese name
access control
limit
User's access to certain information items
Bao Han
Servers, directories, files, etc.
Working energy
Prevent illegal subjects from entering protection.
Question 3: What is access control? What are the elements of access control? Access control refers to the different authorized access of the subject to the object itself or its resources according to some control policy or authority.
Access control includes three elements, namely subject, object and control strategy. Subject: an active entity that can act on other entities, abbreviated as S.
Object: a passive entity accessed by other entities, abbreviated as O.
Control strategy: it is a collection of operating behaviors and constraints of the subject to the object, abbreviated as KS.
Question 4: What is an access control list? The following is a brief summary of several access control lists. ● Standard IP access control list The standard IP access control list matches the source address or part of the source address in an IP packet. You can take two actions to reject or allow the matched packet. Access control lists numbered from 1 to 99 are standard IP access control lists. ● Extended IP access control list Extended IP access control list has more matches than standard IP access control list, including protocol type, source address, destination address, source port, destination port, connection establishment and IP priority. Access control lists numbered from 100 to 199 are extended IP access control lists. ● Named IP access control list The so-called named IP access control list uses list names instead of list numbers to define IP access control lists. It also includes standard lists and extended lists, and the statements defining filtering are similar to those in the numbering method. ● Standard IPX access control list The number range of standard IPX access control list is 800-899. It checks the IPX source network number and destination network number, and can also check the node number part of the source address and destination address. ● Extended IPX access control list The extended IPX access control list is based on the standard IPX access control list. Check the following fields in the IPX header, which are protocol type, source socket and target socket. The number range of the extended IPX access control list is 900-999. Named IPX access control lists are the same as named IP access control lists, and named IPX access control lists use list names instead of list numbers. So it is convenient to define and reference lists, and there are also standards and extensions.
Question: What is the access control in JAVA? There are four access modifiers.
1, private The method or variable modified by this modifier can only be accessed in this class.
2. The method or variable modified by this modifier can only be accessed in the same package class and subclasses of this class.
3.public The method or variable modified by this modifier can be accessed in all classes.
4. By default, methods or variables modified by this modifier can be accessed in the same package class.
Question 6: What is the access control modifier of the method? I answered all three questions of the landlord.
The landlord asked: I have never seen an access control modifier. Generally speaking, they are access control modifiers, non-access modifiers, and some are called non-access delay modifiers.
I didn't know the specific meaning of the landlord, so I told you all the controllers and modifiers:
A method has four access controllers, just like a property: they are all as the name suggests, so I won't explain them in detail.
the public
Protected packages have references that can be accessed by and subclasses.
Package-private, this is the default value. If you don't write anything, the bag is private.
Private private, this class accesses.
As for, the modifier is:
Quiet knows it's quiet.
Final is final, but it cannot be modified.
Abstract abstract methods are declarative, unimplemented methods, and methods with no body and only method names.
Native local method means that the method is not written in java, but in other languages such as c++.
Synchronous modification method becomes synchronous method, which is not used much. Here's the concept.
Question: What is the use of access control in java? 9. What's the use of access control?
exist
This is used in software companies. Let's imagine a scene. In your class, you made up three private methods, mark -to-win. Of course, others can't use it, but you can't use it after class. You must,
Make up another public method in the class, and others can use it casually! But if your public method calls those three private methods in the order of 132, people all over the world can only call that public method, according to 132.
Order, to use three private methods, he wants to call three private methods in the order of 123, and there is no way. Because this kind of publishing right is in your hands, people all over the world will only go to your website to download it. if
Everyone has the need to suggest that you change the order to 32 1, and you must get your consent, add the public methods with the order of 32 1 back to your class, repackage them and publish them on your own website, thus protecting your.
Win-win situation of intellectual property rights.
How to access a class and its members and to what extent depends on the access descriptor it declares.
Java access indicator classification 1.public (public, global) 2.private (private, local) 3.protected 4. Default access level.
Public: When a class member is decorated by a public indicator, the member can be accessed by any other code in the program.
Private: When a class member is designated as private, the member can only be accessed by other members in its class.
Main () is always decorated by public indicators. Called by the code outside the program, that is, called by the Java operating system.
Default Access Level: If the access indicator is not used, the default access right of this class member is set to public in its own package, but it cannot be accessed outside its package.
Source code of this chapter
Level test 3 {
int a； Default access rights
public int b； Public access
Private int c；; Private access
Methods of accessing c #
Void setc(int i) {Set the value of c
c = I；
}
Int getc() {Get the value of c
Return to c;
}
}
Common class test {
Public static void main (strinargs []) {
Test3 ob = new Test3()；
. . . . . . . . . . . . . . . . Specifically, you can find "Mark -to-win" on the Internet, or you can refer to his website or his Baidu Space: the content of Chapter 2 of java.
Question 8: What are security and access control tests? Can unauthorized users access the system and test security? Correct users can log in normally, but incorrect users can log in?
I know whether access control has done some interception and see if these interception have any effect.
Question 9: What is role-based access control? Rbac access is the ability to use computer resources to do something. Access control is a way to allow or restrict this capability in some cases (usually through physical and system-based control).
System). Computer-based access control can not only specify who or operations have the right to use specific system resources, but also specify the types of access allowed. These control methods can be used in computer systems or external devices.
Realize in.
As far as role-based access control is concerned, access decision is role-based, and a single user is a part of an organization. Users have designated roles (such as doctor, nurse, cashier, manager). The process of defining roles should be based on a comprehensive analysis of the organization's operation and should include the opinions of a wider range of users in the organization.
Access rights are grouped by role names, and the use of resources is limited to individuals who should be associated with roles. For example, in the hospital system, the role of doctors can include making diagnosis, prescribing, guiding laboratory tests and so on. The role of researchers is limited to collecting anonymous clinical information for research.
The application of control access role may be an effective means to develop and strengthen enterprise special security policies and simplify the security management process.