Cryptographic Security Evaluation
13-Character Keyspace Metrics
Moderate Defense
Shannon Entropy85.4 bits
Offline GPU Crack Time81.4 million years
Throttled Web Login Crack Time813.9 trillion years+
Total Permutations (95 chars)95^13 ≈ 5.1 × 10^25
Provides 85.4 bits of entropy. Safe against casual attacks, but still short of the NIST-recommended 16-character baseline for long-term cryptographic immunity.
Primary Recommended Use: Standard consumer accounts where forms restrict length under 16.
Why 13 Characters?
Choosing a 13-character password determines the exact balance between user convenience and brute-force resistance. In an environment where attackers use distributed GPU clusters, every character added multiplies the total security search space by 95.
Need Higher Security?
While 13 characters may be acceptable for certain legacy forms, the modern cybersecurity industry standard recommends stepping up to 16 characters (105 bits of entropy) or 20 characters for online banking and primary emails.
Switch to Recommended 16-Character Standard →