Introduction: This article is the course notes from the afternoon session of the Fully Homomorphic Encryption summer class. The afternoon course was taught by Professor Xie Xiang, titled “Theory and Construction of Fully Homomorphic Encryption.” Professor Xie is a researcher at Shanghai Qi-Zhi Institute, primarily engaged in the research and implementation of efficient and secure … Read more
This article is an excerpt from a book produced by Zhihu: “Cats, Einstein, and Cryptography: Quantum Communication That I Can Understand” From Julius Caesar to Sherlock Holmes from Nazi leader Hitler to the father of AI, Turing… How did the ultimate code in the field of communication come into being? All of this must start … Read more
A few days ago, the news of Google cracking the SHA-1 algorithm flooded my social media feed. In fact, the term “crack” is not entirely accurate, it should be that they published an example of breaking the SHA-1 algorithm. Regarding this news, I saw two different comments: A: Wow, that’s amazing! They actually cracked an … Read more
Generate an information digest from plaintext encoding to prevent tampering. For example, MD5 uses a hash algorithm, which outputs a 128-bit string regardless of the input length. The digest algorithm does not require a secret key; both the client and server can use the same digest algorithm to obtain consistent ciphertext for the same plaintext. … Read more
Photographer: Product Manager This Skewered Food Shop Has Finally Opened When reading various encryption articles, you often see that the authors use numbers as examples for encryption. However, in real life, we communicate in Chinese. So how can we encrypt Chinese text? In the article “Don’t Worry, No One Can Snooze Our Chat Messages”, we … Read more
Authors：Zhao Yiqiang，Song Kaiyue，He Jiajie，Ma Haocheng Abstract：In response to current hardware security threats such as integrated circuit (IC) counterfeiting and intellectual property (IP) theft, we propose an enhanced logic encryption algorithm based on secure authorization keys. This algorithm locates the insertion point of the “key gate” through a rare node analysis method, using the fully correlated … Read more
Reliable and Efficient: The Block Cipher Written by | Teacher Kang In the previous five issues, we discussed the intrinsic characteristics and structures of cryptography, as well as the relationship between cryptography and security. Starting from this issue, we enter the second part of this series – the
Commercial cryptographic technology refers to the technology that can implement encryption, decryption, and authentication functions of commercial cryptographic algorithms (including programming technology for cryptographic algorithms and implementation technologies for cryptographic algorithm chips, encryption cards, etc.). Commercial cryptographic technology is the core of commercial cryptography, and the state has classified commercial cryptographic technology as a national … Read more
1. Operations In simple terms, a group ring field is a collection with operations. Let’s first look at some content related to operations. An operation is actually a mapping from one set to another: We call an operation involving n operands an n-ary (target) operation; specifically, if n=2, it is called a binary operation. At … Read more
This article is authored by Jiu Xin, originally published at: Jiu Xin Says. Introduction Recently, I helped the testing team with some signature-related requirements, and today I would like to briefly discuss the topic of signatures with everyone. If you ask why Android needs signatures, everyone might think of the official explanation: ❝ The Android … Read more