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, to tell the truth, I did not like this before (the dog you changed), or I junior high school results will not go to the bottom of the avalanche, then the result is good, and is very good, However, I and many of the funeral love of the family's compatriots, one into the internet bar deep like the sea, from the sister is passers-by, the amount. Seems a bit off the point, but I would like to say: You owe us to bury love family piece of cement land ....

. This binding relationship is declared on the graph with the V-model attribute of the input tag, so you might see in other places that someone has roughly called vue.js as the template engine for declarative rendering.7. Modular DevelopmentRemember that in the traditional front-end development, we are everyone to make a page, and then finally into a variety of back-end template engine, such as PHP smarty or Java JSP and so on.But now we do a single page application, page interaction and structu

Length 5 bitsdon't use easy-to-guess passwordsmodify regularly and do not use passwords that have been used recentlyencryption Method ;Symmetric encryption: Encryption and decryption use the same key:Key Distribution DifficultiesPublic Key cryptography: encryption and decryption using a pair of keysPublic key: Publicprivate key: ConfidentialCA: Certification Scheme AgencyBob AlicePKI:One-way encryption: Unique signatures for extracting data1, fixed-length output:2, non-reversible:3.

indicates that the user is lockedEncryption method:Symmetric encryption: Both encryption and decryption use the same password; playPublic Key cryptography: each password appears in pairs, one for the private key (Secretkey), and one for the public keyOne-way encryption, hash encryption: Extract data signature, also known as fingerprint encryption, often used for data integrity checkSingle characteristics: 1, avalanche effect, microwave changes of ini

Linux User ManagementUser: UID,/etc/passwdUser group: GID,/etc/groupShadow Password:User password:/etc/shadowUser group Password:/etc/gshadowUser Category:Admin: 0Normal Users: 1-66535System users: 1-499General Users: 500-6000User Group Category:Private group: When you create a user, if you have a group that you specify, the system automatically creates a group with the same name as the userBasic GroupAdditional groupsEncryption method:Symmetric encryption: Encrypt and decrypt using the same pas

1: Password file/etc/shadowCat/etc/shadow Red Line part for encrypted password650) this.width=650; "style=" Float:none; "title=" shadow. JPG "alt=" wkiol1brr-zdb0vcaah05ij-4p0973.jpg "src=" http://s2.51cto.com/wyfs02/M01/7D/9C/ Wkiol1brr-zdb0vcaah05ij-4p0973.jpg "/>2: Encryption methodSymmetric encryption: Encryption and decryption using the same key;Asymmetric encryption: Encryption and decryption using a pair of keys; public key-public; private key-secrecy;CA: Digital Certification AuthorityPK

signature;DSA: Digital Signature Algorithm, can only realize digital signature, sometimes this algorithm is also called DSS (digital signature Standard)ELgamal: Algorithm for chargingOne-way encryption algorithm:Encryption cannot be decrypted, and password fingerprints are extracted from known data;Characteristics:1. Fixed-length output:2. Avalanche effect:Function:Ensure the integrity of the data;Common algorithms:MD5: The fifth edition of the Infor

Encryption/Decryption PlainText, ciphertext Common methods of encryption: Symmetric encryption Public Key cryptography: The public key is generated in the private key; One-way encryption: The document can be generated by the plaintext ciphertext; in strict sense, it realizes the extraction of the data signature; The same data, using the same algorithm, the results of multiple calculations will be the same, so it is often used to verify data integrity; Fixed-length output: Re

confirm the identity of the sender;Key exchange: The sender encrypts a symmetric key with the other's public key and sends it to the other party;Data encryptionAlgorithms: RSA, DSA, ELGamalDss:digital Signature StandardDsa:digital Signature algorithmOne-way encryption: The data fingerprint is presented, can only be encrypted, not decrypted;Characteristics: fixed-length output, avalanche effect;function: completeness;Algorithm:Md5:message Digest 5, 12

Write7 111 rwx: Read and write executionC. User: UID/ETC/PASSWDAccount: Login NamePassword: passwordUid:GID: Basic Group IDComment: NotesHome Directory: Home directoriesShell: User's default shellGroup D: Gid/etc/groupGroup name: Password: GID: Comments: List of users with this group as additional groupsE./etc/shellsSpecifies the security shell that is available for the current system2. Shadow Password:A. User:/etc/shadowUser name: Password: Last time the password was modified: Minimum Age: Max

6bit string combined together as the line coordinates of the s box, the remaining four bits as the column coordinates, for example, the first bit of the 010111 string is 0 sixth bit is 1, then the line coordinates is 01B column coordinates is 1011B namely 0xB, Each pair of coordinates of the s box can be obtained with 4 bits of data as shown:Finally, the output from the 8 s box is linked together in order to get a new 32bit string, and then a P-box transformation to produce a new 32bit string,

In a microservices architecture, the service is split into services according to the business, and the service and service can call each other (RPC), which can be invoked with Resttemplate+ribbon and feign in spring cloud. To ensure their high availability, a single service is typically deployed in a cluster. Due to network reasons or their own reasons, the service does not guarantee that 100% is available, if a single service problem, call the service will be a thread blocking, if there is a la

definitely be re-established;b)--initdb: Initialize the database, do not build, there is no need to establish;7, check the source legality, and package integrity;A) encryption type:Symmetric encryption: Encrypt and decrypt using the same keyPublic key encryption: A pair of keys, public key, private key, public key is implied in the private key, can be extracted, and publicly out;One-way encryption: extracting data signature;If the original data, the results will certainly be the same;

@ribbonclient,feign with @enablefeignclients.2. Depending on the location of the service, the Ribbon is declared on the @ribbonclient annotation and feign is used in the interface that defines the abstract method @feignclient declaration.3. In different ways, the ribbon needs to build its own HTTP request, simulate an HTTP request and then send it to other services using resttemplate, which is cumbersome.Feign has been improved on the basis of the ribbon, using interfaces to define methods of o

# cat /etc/shadow:Login Name: Login nameEncrypted passwd: encrypted passwordDate Password change: Password Last modifiedMinimum password Age: Minimum password lifeMaximum password Age: Maximum password lifetimePassword warning Period: Warning time to user when password is about to expirePassword inactivity period: grace period (Intermediate period of time before account is disabled after password expires)Account Expiration Date: Accounts disabled timeReserved field: Reserved fields# cat /etc/gsh

key cryptography seldom encrypts data for secret key exchange.　　One-way encryption: or hash encryption. PlainText cannot be obtained by ciphertext. Used to implement extract data signatures, each of which has unique signatures, such as fingerprint encryption. One-way encryption can be used to perform data integrity checks. The features include:1, non-reversible. That is, only plaintext can be obtained by the ciphertext, and cannot be obtained by cipher text.2,

password is paired, one for the private key (private key), and one for the public key, key starts locks.3, one-way encryption: Also known as hash encryption, fingerprint encryption, can only encrypt can not decrypt, used to extract data signatures, often used for data integrity check, it has two features: (1) Avalanche effect, is what we often say the butterfly effect, as long as there is a small change in the file, the output will have a great chang

-way cryptographic algorithms:1. As long as the data is the same, the encryption results must be identical2. No matter how large the data, the encryption result is fixed long output3. Avalanche (butterfly) Effect: The original information changes the slightest, the result of encryption is very different4. Non-reversibleCommon one-way encryption algorithm:MD5 (Message Digest 5): 128bit fixed-length output;Shal (Secure Hash algorithm) 160bit fixed-lengt

example of one-way encryption:The file that holds the user's password in Linux is called Shadow, if we cat/etc/shadow we will find that the first few formats in the ciphertext are similar: $8 bit ciphertext $ fixed length cipherThe reason for this is that Linux uses one-way encryption to encrypt the user's password, when the user logs in, the system encrypts the password entered by the user, and then compares it with the password fragment inside the/etc/shadow file to determine if the password

guaranteeing its security. Sha blocks the input stream by 512 bits per block (64 bytes) and produces 20 bytes of output called the Information authentication Code or information digest.The input message length of the algorithm is unlimited, the output is a 160-bit message digest. The input is processed in 512-bit groupings. SHA-1 is irreversible, conflict-proof and has a good avalanche effect.The digital signature is realized by hashing algorithm, th