: Converting Japanese words into Latin script (e.g., sakura , daisuki , nihon ).
The top 20 most common passwords in Japan for 2025 are:
Identity and Access Management (IAM) systems must integrate regional dictionaries to block weak, culturally predictable passwords at the moment of account creation. Strengthening Authentication Beyond the Wordlist japanese password list updated
This article was updated March 2025 to reflect the latest Japanese password leak patterns. Stay secure.
1. なぜ「日本独自のパスワードリスト」が危険なのか？ : Converting Japanese words into Latin script (e
Consistently the top offenders, used across various platforms.
Credential stuffing relies on automation to test lists of leaked usernames and passwords across various websites. When attackers utilize an updated, region-specific list, their success rate spikes dramatically for several reasons. Attack Vector Global Wordlist Performance Updated Japanese Wordlist Performance Low efficiency; misses cultural nuances. High efficiency; captures localized user habits. Bypassing Basic Filters Caught by standard "common password" blocks. Bypasses filters that only screen English words. Account Takeover (ATO) Rate Stagnant or declining. Exponentially higher on Japanese domains ( .jp ). Stay secure
暗証番号の延長で設定されがちな数字のみのパスワードは、数秒で解析されます。 12345678 / 111111 20260531 （本日の日付など、特定の年月日） 19980401 （生まれ年や創立記念日）
万が一、最新のパスワードリストによってパスワードが突破されたとしても、スマートフォンへのワンタイムパスワード通知や生体認証（指紋・顔認証）を設定しておけば、不正ログインを完全に阻止できます。利用しているすべての重要サービス（メール、SNS、銀行、ECサイト）でMFAを有効にしてください。
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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。