Experts estimate the list now contains over 15 million unique Japanese account combinations.

These tools generate and store strong, unique passwords for every site, mitigating the risk of reuse. 4. Best Practices for Companies and Individuals

: Using numbers that sound like words (e.g., 4649 for yoroshiku , 39 for sankyuu/thank you ).

Switch to cryptographic passkeys instead of traditional passwords wherever possible.

5. IT管理者・ユーザーが今すぐ導入すべき2つの必須対策

To combat the reliance on weak passwords, major Japanese platforms are shifting toward modern authentication:

Given these risks, moving toward better password hygiene is essential. Here are actionable steps you can take to secure your digital life.

currently targeting Japanese users. Which of these would be most helpful to you?