An overview of 2 Factor Authentication and the TOTP algorithm used for one time passwords. Code examples in Python using https://github.com/pyotp/

1. 2 FA , O T P, W T F ?
@ K E L L E Y R O B I N S O N
T W I L I O

2. ( 2 FA )
T W O FA C T O R
A U T H E N T I C AT I O N

3. FACTORS
• Something you know
• Something you have
• Something you are

4. ( O T P )
O N E T I M E
PA S S W O R D

5. ( T O T P )
T I M E - B A S E D
O N E T I M E
PA S S W O R D

6. ( T O T P )
T I M E - B A S E D
O N E T I M E
PA S S W O R D

7. T O T P A L G O R I T H M

8. 1 . S E C R E T K E Y

9. 2 . C U R R E N T T I M E

10. 3 . S I G N I N G F U N C T I O N

11. 4 . T R U N C AT E

12. https://github.com/pyotp/

13. T H A N K Y O U !
@ K E L L E Y R O B I N S O N

14. https://tools.ietf.org/html/rfc6238
https://twofactorauth.org/
https://authy.com/
https://twitter.com/jessysaurusrex
https://security.stackexchange.com/a/135953
2 FA R E S O U R C E S