Python generates a pair of RSA keys and saves the public and private keys as .pem files respectively. Use the public key in the generated RSA key pair to encrypt the data, and then use the private key to decrypt. Convert RSA’s public key exponent (E) and modulus (N) to .pem format

You can use the cryptography library to generate a pair of RSA keys and save the public and private keys as .pem files respectively. Here is a sample code: from cryptography.hazmat.backends import default_backend from cryptography.hazmat.primitives import serialization from cryptography.hazmat.primitives.asymmetric import rsa # Generate RSA key pair private_key = rsa.generate_private_key( public_exponent=65537, key_size=2048, backend=default_backend() ) # Get […]

HBase database design RowKey

Level 1: Financial RowKey Design Knowledge points 1.RowKey design principles: uniqueness principle, sorting principle, length principle (the shorter the better), hashing principle Programming requirements Follow the prompts and add code in the editor on the right to complete the following requirements: Design RowKey Complete query of a seller’s transaction records within a certain period of […]

Java SE packages, packages, static keywords and code blocks

1. Encapsulation 1.1 Concept of encapsulation There are three major characteristics of object-oriented programs: encapsulation, inheritance, and polymorphism. In the class and object stage, the main research is on encapsulation characteristics. What is encapsulation? simply put It’s the shell shielding details. Encapsulation: organically combine data and methods of operating data, hide the properties and implementation […]

[JUC] 1. synchronized keyword and Lock interface

Article directory 1. JUC 2. Processes and threads 3. Concurrency and parallelism 4. User thread and daemon thread 5. Object locks and class locks 6. Synchronized keyword 7. synchronized case 8. Lock interface 1.JUC JUC, the java.util.concurrent toolkit for processing threads, started with JDK1.5, and has three packages: Basic package Atomic package Lock bag 2. […]

Experiment 5 Temperature collection and keyboard scanning

1. Experimental purpose *Master the method of controlling interrupts and timers in C51 *Master the principles and methods of using CH451 for keyboard input *Master the interface and programming of DS18B20 temperature sensor 2. Experimental equipment *MCU experiment box *CH451 display module *Temperature acquisition module (at the lower left of the SWITCH module area of […]

“Data Structure, Algorithm and Application C++ Language Description” – Code to implement key-value ordered linked list jump list

Skip list Definition Searching in a dictionary of n number pairs described by an ordered linked list requires at most n key comparisons. If a pointer is added to the middle node of the linked list, the number of comparisons can be reduced to n/2 + 1. At this time, in order to find a […]

Storage structure and query performance optimization of ClickHouse primary key index

Table of Contents Storage structure and query performance optimization of ClickHouse primary key index 1. Storage structure of primary key index 2. Query performance optimization methods 2.1. Use primary key index table 2.2. Column storage and data compression 2.3. Merge engine (MergeTree) 2.4. Data copy in conclusion Sample code: Use ClickHouse for e-commerce sales data […]