Hash Generator は何をしますか？
Hash 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： Five hash algorithms, UTF-8 input, Copy individual hashes, Web Crypto SHA digests.
Choose SHA-256 or stronger for security-sensitive fingerprints
Use SHA-256, SHA-384, or SHA-512 for modern integrity checks. Keep MD5 and SHA-1 only for compatibility or comparison with an existing published checksum; do not rely on them for collision resistance.
使い方
- Enter text in the Text input; it is encoded as UTF-8 bytes.
- Wait for MD5, SHA-1, SHA-256, SHA-384, and SHA-512 to update together.
- Copy one digest or use Copy all, then record the algorithm with the value.
実際の入出力例
Known digests for the UTF-8 text abc
入力
abc出力
MD5: 900150983cd24fb0d6963f7d28e17f72
SHA-256: ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015adThe same bytes always produce the same digest; changing case, whitespace, or encoding changes the result.
一般的なエラーと対処
| 症状 | 原因 | 対処 |
|---|---|---|
| The digest does not match another service. | The compared inputs differ by whitespace, line endings, Unicode normalization, or character encoding. | Compare the exact input bytes and algorithm; this page encodes text as UTF-8. |
| A hash cannot be decoded back to the original text. | Cryptographic hashes are one-way digests, not reversible encodings. | Use Base64 for reversible byte representation or encryption for confidential reversible storage. |
Important behavior of Hash Generator
このツール固有の制限： Hashes are one-way fingerprints, not encryption. MD5 and SHA-1 are unsuitable for collision-resistant security.
標準と実装の参考資料
- NIST FIPS 180-4 — Secure Hash Standard (opens in a new tab)Specifies SHA-1 and the SHA-2 family.
- RFC 1321 — The MD5 Message-Digest Algorithm (opens in a new tab)Documents MD5 for compatibility; later security guidance warns against collision-sensitive use.
Hash Generator — FAQ
Does the Hash Generator upload my input?
No. Processing runs in the current browser tab, and the page does not send tool input to a KitLumi processing endpoint.
What input does the Hash Generator accept?
It accepts any text interpreted as UTF-8 bytes. The workspace checks the input and reports malformed or unsupported values before it produces a result.
What does the Hash Generator produce?
It produces lowercase hexadecimal MD5, SHA-1, SHA-256, SHA-384, and SHA-512 digests. Copy and download controls appear when the output format supports them.
What limitation should I know?
Hashes are one-way fingerprints, not encryption. MD5 and SHA-1 are unsuitable for collision-resistant security.
更新内容
実質的な更新： Hash Generator: Added Five hash algorithms, UTF-8 input, Copy individual hashes, Web Crypto SHA digests, responsive controls, explicit runtime disclosure, and task-specific examples and limitations.