Bcrypt 哈希生成器
使用 Bcrypt 哈希密码并验证哈希值
Higher rounds = more secure but slower. 10-12 is recommended.
About Bcrypt
Bcrypt is a password-hashing function based on the Blowfish cipher. It incorporates a salt to protect against rainbow table attacks and uses an adaptive cost factor to remain resistant to brute-force attacks as hardware improves.
使用方法
粘贴或输入内容
在输入区域输入您的文字、代码或数据。
选择选项
选取要应用的转换方式或格式。
复制结果
一键将输出结果复制到剪贴板。
为什么使用此工具
100% 免费
没有隐藏费用，没有付费等级——所有功能完全免费。
无需安装
完全在浏览器中运行。无需下载或安装任何软件。
隐私且安全
您的数据永远不会离开您的设备。不会上传至任何服务器。
支持移动设备
完全响应式设计——在手机、平板或桌面电脑上均可使用。
Bcrypt Password Hashing: Secure Storage Best Practices
Key Takeaways
- Bcrypt is a password hashing function designed to be deliberately slow, making brute-force attacks computationally expensive.
- The cost factor (work factor) controls how many iterations bcrypt performs — increasing it doubles the computation time with each increment.
- All bcrypt hashing runs in your browser — your passwords are never transmitted to any server.
Storing passwords as plain text or simple hashes is a critical security failure. Bcrypt was specifically designed for password hashing, incorporating a built-in salt and an adjustable cost factor that makes it resistant to brute-force and rainbow table attacks. It remains one of the most recommended password hashing algorithms alongside Argon2 and scrypt.
A bcrypt hash with cost factor 12 takes approximately 250ms to compute — making brute-force attacks against millions of passwords impractical.
Computational Cost
Key Concepts
Built-in Salt
Bcrypt automatically generates and embeds a 128-bit random salt in each hash. This means identical passwords produce different hashes, defeating rainbow table attacks entirely.
Cost Factor (Work Factor)
The cost factor determines the number of iterations (2^cost). A cost of 10 means 1,024 rounds. Each increment doubles computation time. Current recommendation is 10–12 for web applications.
Hash Format
Bcrypt hashes follow the format $2b$cost$salt+hash — the algorithm version ($2b$), cost factor, 22-character salt, and 31-character hash are all encoded in the 60-character output string.
Bcrypt vs. Other Algorithms
Bcrypt is CPU-hard but not memory-hard. Argon2 (the Password Hashing Competition winner) adds memory hardness. Scrypt adds both memory and CPU hardness. For most web applications, bcrypt remains a solid choice.
Pro Tips
Use a cost factor of at least 10 (ideally 12) — benchmark on your hardware and choose a cost that takes 200–500ms per hash.
Bcrypt truncates passwords at 72 bytes — for longer passwords, pre-hash with SHA-256 before passing to bcrypt.
Never implement your own bcrypt — use well-tested libraries like bcryptjs (JavaScript) or bcrypt (Python, Ruby, Go).
Increase the cost factor periodically as hardware gets faster — rehash passwords on next login when upgrading.
All bcrypt hash generation is performed entirely in your browser. Your passwords are never transmitted to any server. Note: browser-based bcrypt is slower than native implementations — this tool is intended for testing and education.