Password Generator は何をしますか？
Password Generator はブラウザ上で結果を生成するツールで、結果と制限を明確に示します。 検証済みの機能： Web Crypto random source, 8 to 128 characters, Required set coverage, Entropy estimate.
Prefer length and uniqueness
Use a unique random password of at least 16 characters when supported. Store it in a password manager and enable multi-factor authentication as a separate control.
使い方
- Choose a length of at least 16 characters when allowed.
- Select accepted character sets and exclude ambiguous characters only when manual entry matters.
- Generate and store the unique value directly in a trusted password manager.
実際の入出力例
Generate a 20-character value
入力
Length 20; uppercase, lowercase, digits, symbols出力
One unique random password plus its estimated entropyThe exact output changes every run because bytes come from the browser cryptographic random source.
一般的なエラーと対処
| 症状 | 原因 | 対処 |
|---|---|---|
| The service rejects the password. | Its length or allowed-character policy differs from the selected settings. | Match the destination policy while keeping as much length and character variety as possible. |
| Generated values repeat after manual edits. | A copied password was reused or modified outside the generator. | Generate and store a separate value for every account. |
Entropy is only one security control
このツール固有の制限： The estimate assumes independent uniformly selected characters. It does not account for password reuse, phishing, malware, reset weakness, storage, or service-side hashing.
標準と実装の参考資料
- MDN — Crypto.getRandomValues() (opens in a new tab)Documents the cryptographic random source.
- NIST SP 800-63B (opens in a new tab)Documents current authenticator and password guidance.
Password Generator — FAQ
Are passwords generated on a server?
No. crypto.getRandomValues runs in the browser and generated values are not sent to KitLumi.
How long should a password be?
Use at least 16 random characters for ordinary accounts when the service permits it.
What does entropy estimate?
It estimates the random search space and does not measure storage, phishing, malware, reset, or reuse risk.
更新内容
実質的な更新： Password Generator: Added Web Crypto generation, character-set controls, ambiguity filtering, required-set coverage, entropy estimates, bulk copy, and download.