Click the blue text Follow us The Birth of Asymmetric Encryption Tree Brother: Cryptography can be simply divided into classical cryptography and modern cryptography. We have already introduced substitution ciphers and the Enigma machine in classical cryptography, and now we will begin to discuss symmetric and asymmetric encryption methods in modern cryptography. I’m sure you … Read more
HTTPS (full name: Hypertext Transfer Protocol Secure, is a secure version of HTTP designed with security in mind. This article will delve into its principles. 1 Why HTTPS is Necessary The reason for using HTTPS is quite simple: it is due to the insecurity of HTTP. When we send sensitive data to a server (such … Read more
1. Definition of Cryptography Before the late 20th century, cryptography was more of an art, primarily used for secret communication. At that time, there were no theories to rely on, nor any effective definitions to construct a good cipher. It wasn’t until the 1980s that the emergence of modern cryptography transformed the study of cryptography … Read more
This article provides a preliminary understanding of the field of information security. 1. Briefly describe security attacks, security mechanisms, and security services. Security attack: Any act that jeopardizes the security of an information system. Security mechanism: A process used to detect, prevent attacks, or recover from an attack state to a normal state. Security service … Read more
“IT Chat” is a professional information and service platform under the Machinery Industry Press, dedicated to helping readers master more professional and practical knowledge and skills in the broad field of IT, quickly enhancing workplace competitiveness. Click on the blue WeChat name to follow us quickly. Secure Multi-Party Computation Before discussing secure multi-party computation (hereafter … Read more
1. Introduction The internet is filled with eavesdropping, and our information can easily be obtained by malicious individuals, causing us negative impacts. If you need to transmit confidential or sensitive personal information over the internet, you may need to encrypt it to guard against prying eyes. Using online or mobile encryption software may also expose … Read more
Follow Encounter Mathematics, and discover a more wonderful you Image from: https://slideplayer.com/slide/5369780 The following text is excerpted from “Mathematics Kaleidoscope 2”, with permission from People’s Post and Telecommunications Press, [Encounter Mathematics] expresses gratitude! Modular arithmetic has led to an important development in cryptography: public key encryption. All cryptography relies on keys, and the greatest risk … Read more
3DES is the common name for the Triple Data Encryption Standard. It is an enhanced version of the DES algorithm, equivalent to applying the DES operation three times to each data block. Due to the increased key length, the security level and difficulty of cracking are higher than that of the DES algorithm. The encryption … Read more
Last time, the author introduced some number theory knowledge. With this knowledge, we can understand the RSA algorithm. This is currently the most important encryption algorithm on Earth. 6. Steps for Key Generation We will understand the RSA algorithm through an example. Suppose Alice wants to communicate securely with Bob, how should she generate her … Read more
Abstract:This article is the course notes from Professor Yu Yu’s summer class on homomorphic encryption. Professor Yu is a professor in the Department of Computer Science and Engineering at Shanghai Jiao Tong University, mainly engaged in research related to cryptography. The course first introduces some basic concepts of cryptography, and then discusses some fundamental theories … Read more