저희 도구가 다루는 주제에 대한 배경 지식과 실용적인 설명 — 암호학부터 여행·비자 규정, 웹 표준, 보안까지.
A short guide to hash algorithms: what makes MD5 insecure, what SHA-256 does better, and when to use which algorithm.
더 읽기 →BMI is simple but has blind spots. We compare it with methods for measuring body fat percentage — and explain when each metric is useful.
더 읽기 →How the rolling 180-day window actually works, common myths, and a few examples for visa-free travelers.
더 읽기 →Header.Payload.Signature, signing algorithms, common claims, and security pitfalls — a practical intro to JWT.
더 읽기 →The 5-field syntax, special characters, common patterns, and typical pitfalls — from the classic @daily to the Quartz variant.
더 읽기 →Entropy, brute force, Diceware passphrases, password managers, and 2FA — everything that belongs to a modern password strategy.
더 읽기 →