cryptography software

technologies. Therefore, theoretically, any software encryption technology can be cracked. Only the difficulty of cracking is different. Some of them have to make the best cracker busy for a few months, and some may be cracked without any effort. Therefore, the task of anti-piracy (technical anti-piracy, rather than administrative anti-piracy) is to increase the difficulty of cracking cracker. The cost of cracking

://localhost:8443, the server sends a digital certificate (public key) to the browser to encrypt the data that needs to be sent, but this digital certificateis generated by the Sun Company Command, and is not registered with the CA, so the browser will have the following prompt:Continue to install the certificate here.5: Install digital certificateClick Continue to browse the siteThen always "next" until the "import certificate" finishes and the installation succeeds.Close the browser and open t

Domestic mobile App Store, more forums, there are quite a lot of stores, forums only need to submit, fill in the information and description after a little can be completed upload, there is no audit, so loose mechanism, just to the hacker made " "Opportunity, they are carefully tricksters, step by step let mobile phone users into the suction trap." Below, we will follow the Love encryption technician to understand the mobile phone suction software "cr

How does cryptography protect block chains ?, Cryptography is a protected area Cryptography is a science that Applies mathematical functions to ensure data security. Many popular movies and TV works imply that any system can be cracked if there are enough hackers. This "Hollywood hacker attack" is not a real-world scenario-hackers must discover system vulnerabili

Finding discrete logarithms is very difficultRSA is the first letter of the surname of Ron Rivest/adi Shamir/leonard Adleman.RSA can be used for public key cryptography and digital signatures.RSA encryption: Ciphertext = plaintext EMODN (e and N are public keys)RSA decryption: plaintext = ciphertext DMODN (d and n are private keys)The decryption of RSA:Brute force: The difficulty of brute force will increase with the length of D, and when D is long en

Both A and B were on two islands. B is sick, and a has the medicine that B needs. C has a boat and a lockable box.C is willing to carry things between A and B, but things can only be placed in boxes. As long as the box is unlocked, C will steal everything from the box,No matter what's in the box. If A and B each have a lock and can only open the key of their own lock, how should a be delivered to B?Answer: A put the medicine in the box, lock the box with your own locks. b After getting the box,

Today Learning elliptic curve cipher (Elliptic Curve CRYPTOGRAPHY,ECC) algorithm, his hand lacks the introduction of the algorithm of professional books, so on the internet to check a lot of blog and books, but most of the blog writing is really ... You know... Really deserves to be ' the world article a big copy ' Ah! The same does not say, the key is the introduction is not very clear, is I in the process of reading, produced a lot of doubts can not

The current password must be tested by countless people, proving that there is no trap. If you are not public, no one believes in the security of your algorithm.Many algorithms are later proven to be unsafe. Simply put, the three main foundations of modern cryptography are:1, the introduction of large prime numbers;3, the irreversible nature of the algorithm;2, based on computer operation rather than hand calculation.Based on these three points, in

The basis of probability theory Suppose X and y are random variables defined on a finite set of x and Y respectively. Joint probability P (xi,yi) p (x_i,y_i) is the probability of X=xi,y=yi x=x_i and y=y_i. Conditional probability P (xi|yi) p (x_i \vert y_i) is the probability of Y=yi y=y_i when X=xi x=x_i. If there are P (x,y) =p (x) p (Y) p (x, y) = P (x) p (y) in any x∈x,y∈y x \in x, y \in y, then the random variable x and y are statistically independent. Bayes theorem: P (x| Y) =p (X) P (y

encryption and decryption: Quick exponential computation 1697.5rsa accelerator 1737.5.1 use the short public index for quick encryption 1737.5.2 use the Chinese Remainder Theorem for fast encryption 1747.6 search for large prime number 1777.6.1 universality of prime numbers: 1777.6.2 sever testing 1787.7 actual RSA: Fill 1827.8 attack 1837.9 software implementation and hardware implementation 1867.1 discussions and extensions 1877.11 key points Revie

C ++ encryption and decryption Library Information security has no doubt about the importance of various information systems. Therefore, various programming languages used to implement the software information system will have corresponding libraries related to encryption and decryption. Some languages (such as Java) provide basic components directly in their standard libraries, some languages (such as C ++) require third-party libraries. Modules with

Basic cryptography knowledge I recently liked the CSDN forum and encountered many questions about cryptography. I found that many people do not have enough basic knowledge about cryptography, which may cause some misunderstandings or even jokes. For example, MD5 encryption, MD5 decryption, and so on. I think that since everyone is engaged in

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Public key cryptography system and RSA public key algorithm Abstract: This article briefly introduces the ideas and features of the public key cryptography system, and introduces the theoretical basis, working principle and implementation process of the RSA algorithm, A simple example shows how the algorithm is implemented. At the end of this article, the shortcomings and Solutions of the RSA algorithm are

need to design their own cryptographic algorithms, can not rely on foreign algorithms, but also because of the DES algorithm weaknesses and software implementation of the bit operation and a large number of permutations, With a design life of only 5 years, higher-strength cryptographic algorithms must be designed to replace DES, which are:Lucifer algorithm, Madryga algorithm, newdes algorithm, feal-n algorithm, Redoc algorithm, Loki algorithm, Khufu

certification companyStandard specification for certificatesX.509PKI for Public Key InfrastructureAssuming that a accesses B, B to prove that he is true, it is necessary to prove to the CA that he is true. Generate a key pair A request is then sent to the CA to generate a certificate (containing public key information) to be saved to the CA repository CA provides certificate in warehouse to a, let a download get B's public key Random numberPseudo-random numbers, for exampl

[Cryptography 02] cryptographic system principles and mathematical background In the previous article [cryptography], four theme topics briefly introduced the technical means used to achieve the confidentiality and integrity of information transmission, as well as identity authentication and anti-Repudiation: 1) Password Technology (encryption and decryption ). 2) Hash technology, that is, Hash technology.

decrypts the data with the public key and verifies that the hash is correct. Then, the Bank compares the two "corresponding" to determine whether the two are the same. If the two are the same, the customer's identity is also confirmed.The confidentiality of the private key is implemented by Alibaba Cloud security. The control chip of ushield is designed to write only certificates, and cannot read certificates. All operations using certificates are carried out in ushield. Therefore, the operatio

Significance: The development of public key cryptography is the greatest revolution in the history of cryptography, perhaps the only one. Rotary Press and DES are important symbols of cryptography development, but they are all based on substitution and substitution of these elementary methods. put forward the background: to solve the two most difficult problems i

User login is the basic function of any application system, especially for the internet banking system, the security of user login is especially important. How to design a secure login authentication program for a website is the main issue discussed in this paper.Static password There are a lot of security risks, attackers have many means to obtain static password, management password also has a higher cost, I in the previous article "China Internet Banking system security analysis" has been dem