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First, 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 to different identities. The
To write a shell, you must remotely execute the shell command. Login-free principle: viewplainprint? 1. asymmetric keys are a pair of key-public keys and private keys. 2. the private key is held by no one in the system. it is generally stored in your computer... To write a shell, you must remotely execute the shell command. Login-free principle: View plainprint? First, describe the processing mechanism: 1.
Conceptual differences:Primary key: Refers to a column where the field is unique and is not a null value.Primary key index: refers to the primary key, the primary key does not have a clear concept definition, the primary key is both a constraint, an index, a primary
In general, the current SaaS service provides the current SDK or API docking service that involves an authentication and data encryption issue. It is generally common practice to configure the use of asymmetric encryption to solve this problem, you hold the public key of the SaaS company, the SaaS company holds your public key, you can do encryption and signature verification.Let's look at two ways to gener
Super key: the attribute set that uniquely identifies a tuples in a link is called the super key of the link mode.Candidate Key: A super key without redundant attributes is called a candidate key.Primary Key (primary key): A candi
What is private key cryptography technologyThe private key (symmetric key), also known as the symmetric key. The key encryption algorithm uses the same key for encryption and decryption. It has the advantage of very fast encryptio
We all know that SSH has been providing two ways to log in: Password authentication method and key authentication method, the password is the way we use most often, and then we talk about using the key to log in.Client (Windows Xshell) to Server (CentOS6.6)1. Generate key (public key and private
Reprinted from: http://www.52rd.com/Blog/Detail_RD.Blog_SHRDFresh_52276.html Typhoon days, heavy rain, sleepy at home, left and right nothing .. Continuing the previous article titled "Qualcomm QRD vs. mediainfo TK, the war that just started", I found many comments about the Turn-key topic, so I saved another article. Now the world is claiming to provide the Turn-key solution, and it seems that there is n
Php merge array key value and retain key value implementation method, php merge array key value Php merges arrays.Array_mergeMethod. Array_merge-merge one or more Arrays array array_merge ( array $array1 [, array $... ] ) Array_merge combines the units of one or more arrays. The values in an array are appended to the previous array and returned as the result arra
1. Brief description of public key and private key (two-key encryption technology: Assume that data transmission from data transmitter A to data receiver B (take server a and client B as an example ). B now has a pair of key pairs (public and private keys). B sends the public key
Original (English): http://www.youdzone.com/signature.html This article (Chinese, translated) is reproduced in: http://www.ruanyifeng.com/blog/2011/08/what_is_a_digital_signature.html 1. Bob has two keys, one is the public key, the other is the private key. 2. Bob gave his public key to his friends----patty, Doug, Susan----each one. 3. Susan is going to wr
The public key and private key are a key pair (a public key and a private key) obtained through an algorithm, the public key is the part of the key pair, and the private
Oracle primary key deletion, joint primary key creation, oracle primary key1. Delete the primary key alter table tablename drop PRIMARY_KEY execute the preceding SQL statement to delete the primary key; if it fails, use ALTER TABLE TABLENAME DROP CONSTRAINTS COLUMN CASCADE; -- delete the constraint ALTER TABLE TABLENAM
Super key: the attribute set that uniquely identifies a tuples in a link is called the super key of the link mode.Candidate Key: A super key without redundant attributes is called a candidate key.Primary Key (primary key): A candi
For example, there are three fields: Table person, person, id (mysql database, primary key, non-auto-increment), and name and pswd. In the case of auto-increment, we usually process insertintoperson (name, pswd) values (# {name}, # {pswd}) in this way. you are not allowed to insert a primary key, because the primary keys of the person table are auto-incrementing. But what if the primary
MySQL creates a primary key, a foreign key, and a composite primary key. For more information, see. MySQL creates a primary key, a foreign key, and a composite primary key. For more information, see. 1. Create primary
When the mysql PRIMARY key is set to auto_increment, the PRIMARY key repeat Duplicate entry 'xxx' for key 'Primary ', duplicateentry occurs during the concurrent performance test. When the mysql PRIMARY key is set to auto_increment, the PRIMARY key repeat Duplicate entry 'xx
The ORA exception was encountered today when a unique index was established on an existing table Ora-02437:cannot Validate (primary KEY or UNIQUE key constraint name)-PRIMARY key violated The data for a primary key or unique key has a duplicate value, typically an error in
Primary key repeat duplicate entry ' xxx ' for key ' PRIMARY ' when MySQL primary key is set to Auto_increment, concurrency performance test occursWorkaround:Add settings to the [mysqld] fragment in My.cnf innodb_autoinc_lock_mode=0Also pay attention to increasing the number of active links in JDBC, such as setting jdbc.maxactive=300, because setting innodb_autoi
--PRIMARY keyCREATE TABLE EMP (ID number constraint ID_PR primary key, name1 varchar (8));CREATE TABLE EMP9 (ID number, name1 varchar (8), constraint ABA_PR primary key (ID,NAME1));--FOREIGN keyCREATE TABLE EMP1 (ID number references emp (ID), name varchar (8));--composite FOREIGN keyCREATE TABLE Emp0 (ID number, name varchar (8), Constraint fk_nam1e foreign key
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