Passwords §

• not good
• lots of bad advice
• we are lazy
• “safe” passwords are difficult to enter on touch screen devices
• to many accouts

entropy §

• amount of randomness
• measure of the number of guesse an attacker would need to brute foarce
• $E=lo{g}_2(A^L)$
• A = size of alphabet
• L = length of password
• E = entropy in bits
• 80 bits is “safe”
  • would take decades
• 6 digits passoword - 29 bits (took 4 seconds to brute force)
• • uppercase and numbers - 36 bits