Encryption Strength Calculator

Estimate brute-force time from key length and attacker computing power. Covers symmetric (AES) and asymmetric (RSA) algorithms with quantum threat modeling.

Inputs

Key length (bits)

Attacker speed (log10 keys/sec)

Algorithm type (0-1)

Quantum threat (0-1)

Tab to move between fields

Results

Effective key strength (bits)

256

Security rating (0-4)

Log10 crack time (seconds)64.76

Meets NIST 2030 standard1

Time Description1.33e+47 × age of universe

Time Unituniverse ages

How to Use This Calculator

Enter key length (bits) -- AES-128, AES-256, RSA-2048, RSA-4096, EC-256, or EC-384.
Set attacker speed in log10 keys/sec -- GPU farm ~15, nation-state ~18.
Select algorithm type (symmetric or asymmetric) and toggle quantum threat.
Review effective security bits, estimated crack time (log10 seconds), security rating, and NIST 2030 compliance.
Migrate RSA-2048 to RSA-4096 or EC-256 -- NIST recommends minimum 128 bits of security through 2030.

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