I will provide a summary explanation for four introductory problems from CyLab Security Academy (formerly picoCTF) Cryptography. The problems covered are "Mod 26," "The Numbers," "caesar," and "Easy1.

On June 8, 2026, attackers published six malicious versions of widely-used Python bioinformatics packages to PyPI in under 60 seconds. Every package was uploaded using the Bun JavaScript runtime - an ...

self-replicating worm is spreading across the npm registry using binding.gyp, a file that triggers code execution during npm install without touching package.json scripts. The attack bypasses ...

In cryptography, a Caesar Cipher is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter ...

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本内容遵循CC 4.0 BY-SA版权协议 密码学是信息安全的核心领域之一，经典加密算法在现代通信和数据保护中仍具有重要的学习和应用价值。本文通过Python代码示例，详细介绍了凯撒密码、替换密码 ...

Since ancient times, message encryption has sparked interest, particularly in the military sphere, ranging from the simple Caesar cipher to the German Enigma machine. As the number and complexity of ...

The Caesar Cipher was named after Julius Caesar (100 B.C. – 44 B.C.), who used it for secret military communication. The Caesar Cipher is a substitution cipher. Julius Caesar originally used a shift ...