roles: 1. verification. 2. encryption.
Verification here refers to verifying the identity of the sender to prevent forgery. Encryption refers to the encryption of plaintext to prevent leakage.
Digital signatures can be implemented either by using symmetric encryption or asymmetric encryption. 3. Use symmetric encryption to implement Digital Signatures
Note:
A. Use symmetric encryption (the same key is used for encryption and decryption ).
B. Third-party arbitration is required
Java code is as follows:
package com.queue;public class QueueBuilder { // Building string type array for queue public static Queue queueBuild(String[] str) { Queue queue = new Queue(); for (int i = 0; i
package com.queue;public class QueueGame { public static void main(String[] args) throws ExceptionQueueFull, ExceptionQueueEmpty { // TODO Auto-generated method stub String[] kid = {"Alice", "Bob", "Cindy", "Doug"
algorithmRC4: Stream password, variable key lengthRC5: block cipher, key length variable, maximum 2048 bitsrijndael:128 bit/196-bit/256-bitAES (Advanced Encryption Standard): Des upgrade, algorithm derived from RinjindaelAdvantages of symmetric passwords:Users only need to remember a key, it can be used for encryption, decryption;Compared with asymmetric encryption method, the computation of encryption and decryption is small, fast and easy to use, which is suitable for encrypting massive data.
Many people think that a private cloud is safer if it is exposed in the center of the street and hidden in the courtyard.Let me give you a question about how to evaluate security.1. Alice Night RunHangzhou girl Alice is a marathon enthusiast. She often goes to Wentao Road on the side of Qiantang River for training at night. How much security risks do you think Alice
DH key exchange and ECDH principleTime 2013-06-24 18:50:55 csdn Blogsimilar articles (0) original http://blog.csdn.net/sudochen/article/details/9164427 let's take Alice and Bob as an example to describe the principle of Diffie-hellman key exchange. all participants involved in the 1,diffie-hellman Exchange process define a group in which a large prime number p, base g, is defined. 2,diffie-hellman Key Exchange is a two-part process, both
, only a small amount of data encryption is used. Symmetric encryption algorithms are generally used to encrypt their files, and then use asymmetric algorithms to encrypt symmetric keys used by symmetric algorithms 4.DH only for key exchange
c) One-way encryption
commonly used are: MD5, SHA-1, SHA224, SHA256, SHA384 Features: 1. For data integrity check2. Fixed- length output, avalanche effect3. can only encrypt, cannot decrypt, one-way operationKey exchange algorithm:DH The al
Dead lock/* Deadlock: Multiple threads use different locks, each thread requires a lock held by another thread * appears: synchronized nesting * */ Public class Test01 { Public Static void Main(string[] args) {Tom Tom =NewTom (); Alice Alice =NewAlice (); MyThread MT1 =NewMyThread (Tom, Alice,true); MyThread mt2 =NewMyThread (Tom,
automatically wrapped into a Java list.For example, the Java.lang.ProcessBuilder class has a constructor that takes list
Scala to Java conversion work
def conversionArray: Unit ={ import scala.collection.JavaConversions.bufferAsJavaList import scala.collection.mutable.ArrayBuffer val command = ArrayBuffer("ls", "-al", "/home/cay") val pb = new ProcessBuilder(command) // Scala到Java的转换 println(pb.command())
Conversion between Java and Scala
def conversio
based on the hash function.
The operation mechanism of SSL/TLS protocol can see the overview of teacher Ruan's SSL/TLS protocol operating mechanism
The principle of RSA encryption algorithm can see the two articles of teacher Ruan the principle of RSA algorithm (a), the principle of RSA algorithm (ii)
2.5 Using homing pigeons to explainCryptography is a hard-to-understand discipline that is also very abstract, and any activity on the Internet can be thoug
Document directory
Why vector clocks are easy
Why vector clocks are hard
Why vector clocks are easy
Http://basho.com/blog/technical/2010/01/29/why-vector-clocks-are-easy/Vector clocks by example
Through the following routine examples to help you understand vector clock, you will find that this algorithm is not complex.You want to plan the day of dinner next week? How can we achieve eventual consistency?Of course, this problem can also be solved using paxos.Another idea is to use the vector c
-in.Executors can help you shut down, log off, and enable the optical drive (although it is useless :))YesEnglish-Chinese mutual query, Google search, enter a formula to return the results of the formula, query weather conditions in a region, query the mobile phone locations, query the stock information, query machine performance, and so onAlthough mobile phones can also access the Internet now, the results are really unpleasant, and sometimes some calculations need to be executed by computers,
be considered human. AIML is an XML format that defines rules for matching patterns and determining responses.
AIML's official website: ALICE.
This article briefly describes how to use Python to write a simple chat robot.
1. Install the Python AIML Library
Pip Install AIML
2. Get Alice Resources
After the Python AIML installation is complete, the LIB/SITE-PACKAGES/AIML subdirectory will be available under
as an example (I can also look at my article on the Implementation of RSA decimals). Let's talk about the key selection problem in public key cryptography, encryption, and signature.First, let's talk about communication. communication naturally involves both parties. Of course, you can also communicate with yourself (if you still encrypt the signature at this time, you are idle ......). The master of cryptography gave two nice names, A (lice) and B (ob), to both parties ). The following convent
1. Experiment IntroductionThe company purchased a file server, to improve productivity, the company creates an exclusive folder for employees to use for each department and its employees, but in order to prevent employees from using file servers for things unrelated to their work, the administrator sets quotas for each employee's folder and restricts the storage of movies, Please build an environment of this kind.2, the Experiment Network topology diagram
3, the specific needs of the experime
Beijing's Bob sent a courier to the canton of Alice, on the way through Shanghai, Shanghai Express Center appeared a hacker H, he secretly opened Bob to Alice's Express, and then secretly put the inside of the clothes cut, and then in accordance with the original package sent to Guangzhou, You can see that in the middle of the transmission of such a simple package can be secretly modified inside the thing. The HTTP packet is clear-text transmission,
as an example to illustrate how to implement the RSA decimals. We can also look at my article). Let's talk about the key selection problem in public key cryptography, encryption, and signature. First, let's talk about communication. communication naturally involves both parties. Of course, you can also communicate with yourself. If you still encrypt the signature at this time, you will be idle ......). The master of cryptography gave two nice names, A (lice) and B (ob), to both parties ). The f
: Wave number (~) Parsing, if at the beginning of a word, it is interpreted as the $ HOME directory path of the user.
Step 6: Parameter Parsing. If the word starts with $, parse this parameter variable.
Step 7: Whether to generate command replacement for $ parsing.
Step 8: Performs mathematical operations on the format of $ (string.
Step 9: After several steps starting from step 1, separate words again and use $ IFS as the separator.
Step 10: Path name processing, wildcard processing, including
Help me write a regular expression lt; dd nbsp; class = "clear" gt; nbsp; lt; a nbsp; target = "_ blank" nbsp; title = "Alice cos" help write a regular expression
Alice cos
Alice dress
Alice in Wonderland
Alice crazy regression
communication channel. This apprtc.appspot.com example uses the XHR and Channel APIs as the signaling. This codelab uses the Socket.io, which is a node server.Signaling is used to exchange three kinds of information:
Connection control information: initializing or closing the connection report error.
Network configuration: For the external network, our computer's IP address and port?
Multimedia data: What codec is used and what information can the browser process?
This inf
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