A strong password for Japanese services must resist both global dictionary attacks and localized updates. Follow this updated formula:
Base: A random string of 4+ words (in English) that have no cultural meaning in Japan.
Add: One random Japanese character (not a full word) like あ or ！ (full-width exclamation).
Include: A variable digit based on a personal algorithm (e.g., the last digit of the service’s phone number).
Example: correct-horse-battery-あ-7
Why it works:
Do NOT use:
I tested three recent GitHub repos claiming “updated Japanese password list (2024)”: japanese password list updated
| List Name | File size | Truly Japanese-specific? | Last update | |-----------|-----------|--------------------------|--------------| | jp-passwords-2024.txt | 4.2 MB | ~60% (rest are common English) | Nov 2023 | | japan_weak_passwords.txt | 1.1 MB | Yes, mostly romaji names | July 2022 | | updated_jp_wordlist.txt | 18 MB | No – it’s just rockyou.txt filtered for ASCII | Feb 2024 |
Conclusion: Most are superficial updates – renamed old lists or filtered common English lists. None reflect 2025+ real-world breaches.
A simple Excel/Google Sheet or physical notebook is common in Japan, but it’s risky. If you still prefer a manual list:
✅ Update tip: Every time you change a password, immediately cross out the old entry in red pen (paper) or overwrite the file (digital). A strong password for Japanese services must resist
Feature Description:
This feature aims to assist users in generating and updating their passwords by suggesting strong, unique, and memorable passwords. It takes into account the user's preferences, the context of the account (e.g., work, personal), and linguistic or cultural elements relevant to Japanese users.
Key Components:
User Profiling: Allow users to input their preferences for password generation, such as: Do NOT use : I tested three recent
Password Generation Algorithm: Develop an algorithm that combines user input with a vast database of words, phrases, and characters to generate unique and strong passwords. Ensure the algorithm checks against a database of commonly used or compromised passwords to avoid suggesting easily guessable passwords.
Educational Component: Provide users with information on why strong, unique passwords are important and offer tips on how to keep their passwords secure.
Integration with Password Managers: Allow seamless integration with popular password managers for easy storage and autofill of generated passwords.
Add a localized, up-to-date password resource for Japanese-speaking users that helps them create, evaluate, and manage strong, culturally aware passwords. The feature provides a curated list of commonly used weak passwords in Japan, localized guidance for secure password creation, education on current attacker patterns, and integrated checks in password creation and breach-detection flows.