25-07-2012, 01:21 PM
3-D password
3Dpswd.ppt (Size: 3.29 MB / Downloads: 55)
Password
It is basically an encryption algorithms.
Usually it is 8-15 character or slightly more than that.
Mostly textual passwords nowadays, are kept very simple say a word from the dictionary or their pet names, friends etc.
passphrase
It’s nothing but the enhance version of password.
Usually it is a combination of words or simply collection of password in proper sequence is passphrase.
It contains any well known thought also.
Biometrics
Refer to a broad range of technologies
Automate the identification or verification of an individual
Based on human characteristics or body organs
Physiological: Face, fingerprint, iris
Behavioral: Hand-written signature, voice
Real-life similarity: The prospective 3-D virtual environment should reflect what people are used to seeing inreal life. Objects used in virtual environments should be
relatively similar in size to real objects (sized to scale).
A simple real-life example is home numbering. Assume that there are 20 or more homes that look like each other and the homes are not numbered. It would be difficult to distinguish
which house was visited a month ago.
Similarly,
in designing a 3-D virtual environment, it should be easy for users to navigate through and to distinguish between objects. The distinguishing factor increases the user’s recognition of objects. Therefore, it improves the system
usability.
Number of objects (items) and their types:
Part of designing a 3-D virtual environment is determining the types of objects and how many objects should be placed in the environment. The types of objects reflect what kind of
responses the object will have.
For simplicity, we can consider requesting a textual password or a fingerprint as an object response type. Selecting the right object response types and the number of objects affects the probable password space of a 3-D password.