Password Strength Checker
Analyze password complexity, calculate cryptographic entropy, and estimate brute-force cracking resistance instantly.
About Cryptographic Password Entropy
SuperUtility provides a secure Password Strength Checker that relies on mathematical formulas to evaluate security rather than arbitrary scoring rules. Cryptographic entropy (measured in bits) defines the total search space a hacker must traverse to guess a password using brute-force algorithms.
Higher entropy indicates a password is more resistant to cracking attempts. For example, a password with 64 bits of entropy takes approximately 18 billion billion attempts to exhaustively search, providing robust security.
Frequently Asked Questions
What are bits of entropy?
Entropy (H) measures password randomness. It is calculated using the formula: `H = L * log2(R)`, where `L` is the length of the password and `R` is the size of the character pool (lowercase, uppercase, numbers, symbols). Higher bits mean superior safety.
Is my tested password safe?
Yes. SuperUtility computes all password assessments strictly client-side inside your browser sandbox. Unlike central rating websites, we never transmit your typing over the network, guaranteeing absolute immunity against server sniffing.
What is a secure entropy threshold?
- Under 40 bits: Weak (guessable in seconds). - 40 to 60 bits: Fair (vulnerable to fast GPU rigs). - 60 to 80 bits: Strong (secure for standard logins). - Over 80 bits: Excellent (virtually uncrackable).