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Encryption and authenticationFirst, we need to distinguish the two basic concepts of encryption and authentication.Encryption encrypts data so that illegal users cannot obtain the correct data even if they have obtained the encrypted data. Therefore, data encryption can protect data and prevent attacks. The focus is on data security. Identity Authentication is used to determine the authenticity of an identity. After the identity is confirmed, the system can grant different permissions according
The main purpose of this article is to realize the digital signature problem of PDF, just as a summary of my learning knowledge.1. Overview of digital Signature AlgorithmThis section mainly refers to: 75007189Digital signature: The private key is used for signing, and the public key is used for authentication.The role of digital signatures:Verify data integrity, source of authentication data, anti-repudiati
Desktop operation:? Snap window: Win + Left/right > win + up/down > window can be changed to 1/4 size placed in 4 corners of screen? Toggle window: Alt + Tab (not new, but task switch interface improved)? Task view: Win + Tab (Release keyboard interface does not disappear)? Create a new Virtual desktop: Win + Ctrl + D? Close the current virtual desktop: Win + Ctrl + F4? Switch Virtual desktops: Win + Ctrl + Left/RightIn addition, Microsoft has added Ctrl + V support for the WIN10 command line, a
Primary key: There are several attributes in the record, and if one of the attribute groups (note is a group) can uniquely identify a record, the attribute group can become a primary key;PRIMARY key //primary keyYour foreign key is the primary key of the other table so joi
This article references Http://www.cnblogs.com/jimshen/archive/2009/11/09/1599347.html Http://blog.csdn.net/allwtg/archive/2009/12/09/4969543.aspx Concepts of public and private keys In modern cryptographic systems, encryption and decryption use different keys (public keys), that is, public keys.Algorithm(Also called asymmetric algorithms and two-key algorithms) ", each communication party requires two keys, namely, the public
The Redis key (Key) command command describes the Redis DEL command, which is used to delete key in key presence. The Redis Dump command serializes the given key and returns the serialized value. The Redis EXISTS command checks to see if a given
Label:Iv. SQL PRIMARY KEY constraint PRIMARY KEY constraint uniquely identifies each record in a database table The primary key must contain a unique value Primary key columns cannot contain NULL values Each table should have a primary key, and each table can have only one p
Label:The role of the primary and foreign keys of sql: Foreign key value rule: A null value or a reference primary key value. (1) When a non-null value is inserted, it cannot be inserted if the value is not in the primary key table. (2) When updating, you cannot change the value that is not in the primary key table. (3
Key-Value Pair storage (1): What is key-Value Pair Storage? Why? Author: Emmanuel Goossaert Original article: codecapsule.com In this article, I will begin with a short description of what a key-value pair is. Then I will explain some reasons for this project, and finally I will explain the main objectives of the key-
Redis key Space Notification (KEYSPACE notification) This document is translated from: Http://redis.io/topics/notifications. The key space notification feature is still under development, and the content described in this document, as well as the specific implementation of the functionality, may change over the next few weeks, please be informed. Features Overview A key
The concept of public key: The public key can be transmitted over the network, that is, the receiving sender can know each other's public key, of course, if you use network sniffing technology, you can also sniff the content of the public key on the network, but you only have the public
Tags: style blog ar color sp for on data divThe role of the primary and foreign keys of sql:Foreign key value rule: A null value or a reference primary key value.(1) When a non-null value is inserted, it cannot be inserted if the value is not in the primary key table.(2) When updating, you cannot change the value that is not in the primary
I. Public Key and Private Key 1. The public key and private key appear in pairs.2. Public Keys are called public keys. Only private keys that you know are called public keys.3. Only the corresponding private key can decrypt the data encrypted with the public
is not necessarily a primary key, but must be a unique index. primary KEY constraints and uniqueness constraints are unique indexes. FOREIGN KEY Constraint SQL Server 2008Other versions A foreign key (FK) is one or more columns that are used to establish and enforce links between two table data. You can create
Transferred from: http://blog.csdn.net/duck_arrow/article/details/8264686Concept:A primary key (primary key) uniquely identifies a property or group of properties for a row in a table. A table can have only one primary key, but there may be multiple candidate indexes. Primary keys often form referential integrity constraints with foreign keys, preventing data inc
one, compound primary key The so-called compound primary key means that your table's primary key contains more than one field composition, and does not use an ID with no business meaning as the primary key. Like what CREATE TABLE Test ( name varchar, ID number, value varchar (), primary
Tags: different HTML range prevents intermediate replace between following tables create tableConcept: A primary key (primary key) uniquely identifies a property or group of properties for a row in a table. A table can have only one primary key, but there may be multiple candidate indexes. Primary keys often form referential integrity constraints with foreign ke
Tag: Symmetric key asymmetric password public key(i) Symmetric encryption (symmetric cryptography)Symmetric key encryption, also known as private key encryption, that is, the sender and receiver of the information with a key to encrypt and decrypt the data. Its biggest advan
One, public key private key1, the public and private keys appear in pairs2, the public key is called the public key, only you know the private key3, the data encrypted with the public key can only be decrypted by the corresponding private key4, the data encrypted with the private k
: This article mainly introduces the opensslrsa key format and solves the key format issues for php and c ++ collaborative development. For more information about PHP tutorials, see. OpenSSL programming-RSA programming This article was published by maxcompute in June 26, 2014. Views: 1,954, comments: 0 I. RSA PEM file format 1. PEM private key format file----- B
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