Jan 21 · 3 min read · Working with RSA keys can feel like deciphering ancient secret scrolls: Which key size should I use? Why does this public key look like a paragraph? When was the private key last updated?! If you’ve ever wrestled with OpenSSL commands and ended ...
Join discussionDec 23, 2025 · 1 min read · In many applications, cryptography happens behind the scenes in a server-side 'black box.' When building the RSA Message Encryption Demo, I wanted to bring that logic directly into the browser, using Web Cryptography API to make the process transpare...
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Oct 26, 2025 · 13 min read · Let’s start the story with how constant time came into light in late 1996, when Paul Kocher published a novel attack on RSA, specifically on the RSA implementation, that extracted information on the private key by simply measuring the time taken by t...
Join discussionSep 11, 2025 · 5 min read · The Chinese Remainder Theorem (CRT) sounds fancy but it is one of the most concrete and useful results in elementary number theory: it explains how a number can be completely described by its remainders when divided by several pairwise-coprime moduli...
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Aug 18, 2025 · 7 min read · Introduction In today's digital landscape, protecting sensitive documents is a critical task for developers and organizations alike. Whether it's invoices, contracts, or internal documents, ensuring that PDFs are not accessible or editable by unautho...
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Aug 4, 2025 · 6 min read · While doing multiple courses, honing my practical hacking skills, and reading through dozens of blog posts and cybersecurity updates, I often encountered the information that asymmetric encryption algorithms are more secure than symmetric ones. Plea...
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Jul 27, 2025 · 2 min read · In this challenge, we intercepted an encrypted communication between Cipher and three associates—Rivest, Shamir, and Adleman. The intercepted file contained an RSA-encrypted message that we were tasked to decrypt in order to reveal a secret key. The ...
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Jul 13, 2025 · 4 min read · Vamos a ver como podríamos recuperar de forma fácil el acceso a un IaaS al que se ha perdido el authorized_keys del usuario opc. Antes de entrar en faena, vamos hacer un pequeño resumen de lo que es cada punto: authorized_keys: fichero que contiene ...
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Apr 24, 2025 · 4 min read · Introduction In the world of computer science and mathematics, randomized algorithms have become powerful tools for solving complex problems efficiently. Unlike deterministic algorithms, which follow a fixed sequence of steps, randomized algorithms i...
GNPSPHarshal and 15 more commentedMar 22, 2025 · 3 min read · 🧐 What is a JWT (JSON Web Token)? A JWT (JSON Web Token) is a compact, self-contained token used to securely transmit information between parties. It is commonly used for authentication and authorization in APIs. 🔹 Why Use JWTs? ✔ Stateless Authent...
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