Generate secure, random 48-character passwords. 316 bits of entropy — maximum strength. Everything runs in your browser.
Use ⌘ + D to bookmark this toolA 48-character password provides 316 bits of entropy — well beyond even theoretical quantum computing attacks (Grover's algorithm halves the effective bits, leaving 158 bits of quantum-resistant security). This length is exclusively for machine-generated, machine-stored secrets. No human should attempt to memorize a 48-character random string.
Entropy is calculated as: length × log₂(pool_size). With 48 characters from the full 95-char printable ASCII set, you get 316 bits of entropy. Brute-force time at 10 billion guesses/sec: ∞.
50 pre-generated examples. Use the generator above for a cryptographically fresh password — these are for illustration only.
HMAC-SHA384 requires 48-byte keys for full security. Some enterprise PKI systems use 48-character administrator recovery passwords. High-security key escrow systems may require 48+ character recovery phrases.
Full-strength HMAC-SHA384 signing keys require 48 bytes of key material. Used in high-security message authentication where SHA-256 is considered insufficient margin.
Master seeds for HKDF (HMAC-based Key Derivation Function) that derive multiple sub-keys for different purposes — encryption, authentication, and key wrapping — from a single strong secret.
Secret shares in Shamir's Secret Sharing and multi-party computation protocols where individual shares must be long enough to maintain security properties of the combined secret.
Break-glass emergency access credentials stored in physical safes or secure vaults. These are used only when all other authentication mechanisms fail — perhaps once per decade.
| Length | Entropy | Crack Time (GPU) | Rating | Recommended For |
|---|---|---|---|---|
| 6 chars | 39 bits | 3.5 seconds | Weak | temporary or throwaway accounts only |
| 8 chars | 53 bits | 1.3 days | Fair | low-security accounts where the site enforces rate limiting |
| 10 chars | 66 bits | 117 years | Good | general-purpose accounts and social media |
| 12 chars | 79 bits | 1.1 million years | Strong | general accounts |
| 14 chars | 92 bits | 10 billion years | Strong | sensitive accounts |
| 15 chars | 99 bits | 894 billion years | Excellent | business accounts |
| 16 chars | 105 bits | 84 trillion years | Excellent | master passwords |
| 20 chars | 132 bits | 7 × 10²¹ years | Overkill | master passwords |
| 24 chars | 158 bits | 6 × 10²⁹ years | Overkill | maximum security |
| 32 chars | 211 bits | 4 × 10⁴⁵ years | Overkill | encryption keys |
| 48 chars | 316 bits | ∞ | Maximum | cryptographic secrets and machine-to-machine authentication |
| 64 chars | 421 bits | ∞ | Maximum | cryptographic keys |
Crack times assume 10 billion guesses/sec (GPU cluster with MD5). Bcrypt/Argon2 hashing makes these 10,000x–100,000x slower.
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Yes. A 48-character password using uppercase, lowercase, numbers, and symbols provides 316 bits of entropy — well beyond what brute-force attacks can crack. It would take ∞ to break with current GPU technology.
With a modern GPU cluster computing 10 billion hashes per second, a random 48-character password using all character types (95-char pool) would take approximately ∞ to crack by brute force. Using only lowercase letters would be significantly faster to crack.
Both matter, but length has a greater impact. Each additional character multiplies the total combinations by the pool size (up to 95 for all printable ASCII). However, using all character types (uppercase, lowercase, numbers, symbols) maximizes the pool size, which also multiplies security exponentially.
Yes. You cannot reliably memorize unique random passwords for every account. A password manager securely stores all your passwords behind one strong master password, and can auto-fill them across devices and browsers.
A 48-character password is recommended for: cryptographic secrets and machine-to-machine authentication. Always use the strongest password practical for each account, and never reuse passwords across sites.