Security • • By LetterGen Team
Character Entropy: Calculating Strength in Random Letter Sequences
Understand bits of entropy, dictionary attacks, and why length beats complexity in passwords.
Entropy is the measure of unpredictability in a security key or password.
Entropy Calculation
For an alphabet of size N = 26 (lowercase letters only), each character contributes approximately 4.7 bits of entropy.
When both uppercase and lowercase letters are allowed (N = 52), each character provides approximately 5.7 bits of entropy.
A 16-character random letter string provides over 91 bits of entropy, making brute-force attacks computationally impossible with current hardware.