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content/notes/04-authentication-authorisation-passwords.md
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@ -49,4 +49,16 @@ tags:
- lots of bad advice - lots of bad advice
- we are lazy - we are lazy
- "safe" passwords are difficult to enter on touch screen devies - "safe" passwords are difficult to enter on touch screen devies
- to many accouts - to many accouts
## entropy
- amount of randomness
- measure of the number of guesse an attacker would need to brute force
- $E = log_2(A^L)$
- 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