推測できる簡単なパスワードを利用しないようにしよう | 国民のためのサイバーセキュリティサイト

This page explains the importance of proper password management for internet use. For secure passwords, a minimum of 10 characters with mixed uppercase, lowercase, numbers, and symbols is ideal; alternatively, combining unrelated words with numbers is effective. Dangerous passwords like names, birthdates, and common words should be avoided. Password storage requires keeping them confidential, avoiding email transmission, and never displaying them publicly. Password manager tools are recommended. Additionally, avoid reusing passwords across multiple services, and regular changes are unnecessary unless there is actual evidence of a breach.