cryptography digest

The binlog parsing tool is widely used. mysqlbinlog is the most commonly used tool. It has its own merits. For DBA, this article only introduces pt-query-digest, which can be used to solve the problem. The binlog parsing tool is widely used. mysqlbinlog is the most commonly used tool. It has its own merits. For DBA, this article only introduces pt-query-digest, which can be used to solve the problem. T

A script for slow query log tracking based on pt-query-digest Percona-toolkit is called MySQL DBA's "Switzerland ***", and its strength is self-evident. The slow query and analysis tool "pt-query-digest" provides many additional attributes, such as flexible filters, compared with the official "mysqldumpslow, database and table-based analysis and sorting. Today, we will share a small script that automaticall

If you angular $apply, $digest, $watch indefinitely, then I believe that the following words can make you understand deeply! This article is aimed at the students who have known $apply, $digest, $watch. That is to say you have searched many blog forums for $apply, $digest, $watch, though somewhat masked, but indefinitely feeling. If you have never been to the u

Basic and digest certification for REST API with Spring security (Digest): Basic Certification 1. Server-spring Security Configuration Package com.pechen.config; Import org.springframework.beans.factory.annotation.Autowired; Import Org.springframework.context.annotation.Bean; Import org.springframework.context.annotation.Configuration; Import Org.springframework.security.authentication.AuthenticationManager

function that is provided when performing a dictionary-like operation. Abstract algorithm: Cryptographic hashlib: A module that provides a digest algorithmimport hashlib # module that provides the digest algorithm MD5 = hashlib.md5 () md5.update (b' 123456')print(md5.hexdigest ())# AEE949757A2E698417463D47ACAC93DFNote: No matter how different the algorithm, the function of summary is always the same;F

An alternative method of Basic authentication proposed by Certified Digest authentication ←http1.1 Server-side to nonce for questioning, the client to the user name, password, nonce,http method, the request URI, such as the basis of information generated by the response information to authenticate the way. ※ Clear Text delivery without a password Summary Authentication steps: 1. Clients access a resource that is protected by HTTP

How many times the $digest loop will run. When a $digest loop runs, watchers is executed to check if the models in the scope has changed. If there is a change, the corresponding listener function will be executed. This relates to an important issue. If the listener function itself modifies a scope model. What Angularjs will do with this situation. The answer is that the $

A simple HTTP request, it took me almost a day, just because a httpclient implementation is somewhat inconsistent with the specification.The server uses the Digest authentication, uses the Nginx, we use the IOS,JS to write the program all to have the smooth access, the browser, the curl naturally also is easy, but the Java program Access always reported 401 or 400 error.Grab packet analysis, your own program than the program generated by the response

MySQL performance profiling tool (pt-query-digest) This tool is also from percona-toolkitOther tools in this tool setTroubleshooting of abnormal shutdown of MySQL Slave (pt-slave-restart)Verify MySQL master-slave consistency (pt-table-checksum pt-table-sync)It can analyze various logs to analyze performance issuesIncluding1. Slow log (default)2. tcpdump3. general log4. binlog5. show processlistThe experiment simulates a certain amount of pressure thr

[Git Note] "error: 0D0890A1: asn1 encoding routines: ASN1_verify: unknown message digest algorithm" solution, messagedigest Note:The premise described in this note is that git has been successfully installed on the machine and supports obtaining remote repositories through https by configuring the ca certificate. If you encounter the problem described in this article when using git, then we can solve the problem according to the solution provided in t

MD5 is message-digest algorithm 5 (Information-Digest algorithm 5), which is used to ensure complete and consistent information transmission. is one of the widely used hashing algorithms (also translated digest algorithm, hashing algorithm)The MD5 algorithm has the following characteristics:1, compressibility: Any length of data, calculated the length of the MD5

Abstract algorithm is called the hash algorithm, which represents the input of arbitrary length of data, output fixed-length data, the same input data always get the same output, different input data as far as possible to obtain a different output.The method in Java Object.hashCode() is a digest algorithm, it can enter arbitrary data, its output is an int type, that is, 4 bytes of fixed-length data, while the same input will get the same output, this

= f + H (i-1) 5H (i) 6 = g + H (i-1) 6H (i) 7 = h + H (i-1) 7After all the messages are grouped to complete the above calculation, the final output is computed. For SHA-256, it is the concatenation of all H (n) 0, H (n) 1 to H (N) 7. For SHA-224, the concatenation of H (n) 0, H (n) 1 until h (N) 6.5 , code implementationWe have already explained the calculation of SHA-256 (SHA-224), and we will then code this process. The same first defines the structure of a context.1 /** Defines the content i

Abstract stream is a type of stream filtering. It can be used to read and write the digest information (MD5/Sha) of the stream ). When packaging a stream using a digest stream, an additional messagedigest object needs to be passed, Messagedigest MD = messagedigest. getinstance ("MD5"); Digestinputstream dis=NewDigestinputstream (in, MD ); The Digest stream rew

Note: This section is mainly referred to from the art of Java Encryption and decryption (2nd Edition), Chapter 6th, "Verifying data integrity-message digest algorithm"4.1. SHARationale: The longer the Message digest length (which can be quantified as the length of the encrypted string), the higher the security md5:128 bit binary Digest (32 bit 16 binary

authorization request header information to decrypt, and compares with the user database to judge whether the legality, the legal will return the OK, as to whether sends Authentication-info the head is optional 1PHP2 if(!isset($_server[' Php_auth_user '])) {3 Header(' Www-authenticate:basic realm= ' My Realm ');4 Header(' http/1.0 401 Unauthorized ');5 Echo' Text to send if user hits Cancel button ';6 Exit;7}Else {8 Echo"$_server[' Php_auth_user ']}. ;9 Echo"$_ser

Summary Certification Digest authentication←http1.1 proposed alternative method of Basic authenticationServer-side to challenge the nonce, the client to the user name, password, nonce,http method, the requested URI and other information based on the response information generated by the authentication method.※ Clear Text Pass with no passwordSummary certification steps:1. The client accesses a resource protected by HTTP

In security-related applications, we usually use digital signature technology, and most of them are implemented through MD5 or sha1 information digest algorithms, series 60 2nd and earlier versions have not published this API. We can only transplant it according to the C Language Algorithm in the RFC document. Of course, it is not difficult to transplant it. the release of Symbian OS V9 makes things easier. It discloses some security APIs. The followi

Alibaba pen questions: The English description of a product is given, which contains M English letters. Each English word is separated by a space and has no other punctuation marks. Then, n English word keywords are given, please explain your ideas and programming implementation method string extractsummary (string description, string [] keywords). The goal is to find out that this product description contains N keywords (each keyword should appear at least once) as the product introduction outp

Messagedigest (Message Digest) Http://www.lukfor.com Message DigestAlgorithmThere are mainly the following types: Md2: The md2 message digest algorithm as defined in RFC 1319. MD5: The MD5 message digest algorithm as defined in RFC 1321. SHA-1: The secure hash algorithm, as defined in Secure Hash Standard, nist fips 180-1. SHA-256,SHA-384, AndSHA-512: