如何Generate 安全关键
生成 cryptographically secure keys for AES, RSA, and other algorithms using proper randomness.
问题
你 need cryptographic 键但 want 到确保它 是 generated 具有充分 entropy 和正确大小.
前置条件
- Understanding 的 cryptographic randomness
- Knowledge 的键 sizes 为目标 algorithm
步骤
-
1. Choose the key type and size
For AES, choose 128, 192, or 256 bits. For RSA, choose at least 2048 bits (3072+ recommended). For HMAC, the key should be at least as long as the hash output. Match the key size to your security requirements.
输入AES-256输出32 bytes (256 bits) -
2. Use a cryptographically secure RNG
Generate the key using a cryptographically secure random number generator (CSPRNG). In browsers, use crypto.getRandomValues. In Node.js, use crypto.randomBytes. Never use Math.random or other non-secure PRNGs for keys.
输入crypto.randomBytes(32)输出32 secure random bytes -
3. Store the key securely
Store the key in a secure key store, environment variable, or hardware security module. Never commit keys to source control. If deriving from a password, use a KDF like PBKDF2 or scrypt with a high iteration count and a random salt.
输入key + secure storage输出key available at runtime, not in code
预期结果
cryptographically random 键的 正确大小, stored 安全和 从不 exposed 在源 代码.
常见错误
- Using Math.random for key generation
- Math.random is not cryptographically secure. Always use crypto.getRandomValues or crypto.randomBytes.
- Deriving a key with a single hash of a password
- Use a proper KDF (PBKDF2, scrypt, or Argon2) with a high iteration count and a random salt to resist brute force.
排障指引
- If keys are predictable, verify the RNG source is a CSPRNG and not seeded with a known value.
- Check that the key length matches the algorithm requirement exactly.
安全限制
- Keys generated on this tool stay in your browser. No key material is transmitted or stored remotely.