The document discusses 3D passwords as a new multifactor authentication scheme. 3D passwords combine existing schemes like passwords, biometrics, and tokens by requiring users to navigate a 3D virtual environment and interact with objects to form their password. The 3D environment and object selection results in a large password space that is difficult to crack through brute force or other attacks. Users have freedom to choose the types of objects and interactions to construct personalized 3D passwords for authentication.

2.  Commonly used authentication schemes are
textual passwords, graphical passwords and
biometrics.
 3D password is a multifactor authentication
scheme.
 To be authenticated, we require a 3D virtual
environment.

3.  Combines recognition, recall, token, and
biometrics based systems.
 Users choice to select the type of authentication
technique.

4.  KNOWLEDGE BASED
Recall based
Recognition based
 TOKEN BASED
e.g : smart card

5.  BIOMETRIC BASED
◦ Fingerprint ,palm prints ,hand geometry ,face recognition
◦ Intrusiveness upon a user’s personal characteristics.
 GRAPHICAL PASSWORDS
◦ Recognition based
◦ Recall based

6.  New scheme should combine the existing
authentication schemes
 Freedom to select the type of authentication
technique.
 Should provide secrets that are easy to
remember, difficult to guess.

7.  3D environment space represented by the co-
ordinates
 User navigate into the 3D virtual environment
using any input device.
 The sequence of actions and interactions forms
the users 3D password.

8.  Real-life similarity
 Object uniqueness and distinction
 Three-dimensional virtual environment
 System importance

9.  Critical servers.
 Nuclear and military facilities.
 Airplanes and jet fighters.
 ATM, desktop computers and laptops.

10.  3D Password Space Size.
 3D Password Distribution Knowledge.

11.  Brute Force Attack
 Well-Studied Attack
 Shoulder Surfing Attack
 Timing Attack

12.  Commonly used authentication schemes are
vulnerable to attacks.
 3D Password is a multifactor authentication
scheme.
 Design of 3D virtual environment, selection of
objects inside the environment, and the object
type reflects the resulted password space.
 User’s choice and decision to construct the
desired and preferred 3D password