Diving deeper into the GitHub Japanese wordlists , Kenji noticed "seasonal" security: Fuyu2016 (Winter), Haru2017 (Spring), and Aki12345 (Autumn) were peppered throughout the leak.
One of the most alarming findings is that "admin" has overtaken "123456" as the most common password in Japan. This reveals a critical and often overlooked vulnerability: default credentials on routers, IoT devices, and corporate equipment. Attackers scanning the internet for devices with unchanged "admin" passwords can easily take control of them, using compromised routers and smart devices as a gateway to the home network or as springboards for larger cyberattacks.
If you want to strengthen your enterprise authentication systems against these specific regional threats, let me know:
The list will keep growing. Your security must evolve faster.
サイバー犯罪者が使用する「japanese password list」は、日々巧妙にアップデートされています。「自分は大丈夫」「日本のローカルなサービスだから安全」という油断は禁物です。 japanese password list updated
: 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).
If you need help securing your organization or optimizing your system defenses, let me know:
セキュリティ機関や数百万件の漏洩データの解析から判明した、日本国内で特に使われがちな危ないパスワードのパターンは以下の通りです。
These tools are for legitimate security assessments on systems you own or have explicit permission to test. Unauthorized use is illegal. For researchers building wordlists for ethical purposes, building on the "most common password" datasets (like rockyou.txt and xato-net-10-million-passwords.txt ) provides the best baseline. For a more targeted list, web scraping a company's website with tools like CeWL can generate a list of local terms, names, and jargon. Once a core list is compiled, processing it to sort by frequency ( sort combined.txt | uniq -c | sort -nr > ranked.txt ) allows testers to prioritize the most common passwords first. Diving deeper into the GitHub Japanese wordlists ,
admin123 （管理者アカウントの初期設定の放置） ④ 予測しやすい数字の並び
A simple Excel/Google Sheet or physical notebook is common in Japan, but it’s risky. If you still prefer a manual list:
I can provide specific configuration steps to help you block these regional password patterns. Share public link
like how cultural words (e.g., "sakura") compare to Western ones Attackers scanning the internet for devices with unchanged
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Do you currently utilize any during registration?
This article was updated March 2025 to reflect the latest Japanese password leak patterns. Stay secure.