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Two Factor Authentication
cryptoparty @hsgr
by ebal
1
How am I ?
●

http://ebalaskas.gr (blog/wiki)

●

@ebalaskas twitter/identica

●

plz interrupt during this awesome talk

●

this presentation has only 8 pages!

2
Whats the problem ?
●

My Pin/Password is: 123456

●

My Pin/Password is: r(>X5^&3Z*;evqxJ9&=1$

●

Login Site saves passwords cleartext or unsalted

●

Login Site is not over httpS

●

This isnt my PC !

●

This is a public network

●

I use my android/iphone/etc
3
What is the ideal ?
●

Different Passwords for different accounts !
–
–

●

●

●

Predefined list ?
Sync ?

Could i use something that i dont have to type ?
Is it possible to use something i have and 
something to type ?
Is it possible the password changes automaticaly 
every minute?
4
Do i need to use my eye ?
●

Yes and No
–

you can use biometrics but do you really want to 
put your eye/finger to a hole?

●

Crypto­tokens

●

ibuttons

●

Smart cards (bank cards)

●

Usb (yubikey)
5
hardware

6
Plz tell me some acronyms
●

OTP

●

RFC 2289

●

OTPW

●

http://www.cl.cam.ac.uk/~mgk25/otpw.html

●

HOTP

●

RFC 4226

●

TOTP

●

RFC 6238

A One-Time Password System
● A one-time password login package
● An HMAC-Based One-Time Password Algorithm
● Time-Based One-Time Password Algorithm
●

7
Questions ?
http://gr.linkedin.com/in/evaggelosbalaskas

8

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Two-factor authentication