RSA Key Strength Calculator
Calculate RSA key strength, equivalent symmetric key length, brute force time, and security margins.
Inputs
bits
Results
Security Level
112 bits
Equivalent Symmetric Key
112 bits
Brute Force Time
164,500,000,000,000 years
ECC Equivalent Key Length224 bits
Key Space2,048 bits
How to Use This Calculator
- Enter the RSA key size in bits (1024, 2048, 3072, 4096).
- Set the attacker factoring compute budget (current hardware or projected future).
- Review the equivalent symmetric security level in bits.
- Verify that 2048-bit keys provide about 112-bit security -- the current NIST minimum for new systems.
- Plan migration to 3072+ bits by 2030 per NIST SP 800-131A recommendations.
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Formula
Security level per NIST SP 800-57 lookup (e.g., RSA-2048 ≈ 112-bit security)Related Calculators
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