advantages of graphical password

Graphical password schemes have been proposed as a possible alternative to taxt-based password. [Xiouyuan,2006] stated that graphical password are :

1. Esier to remember
2. Provide large password space
3. better resistance towards dictionary attacks
4. Offer higher level of security
   

Reproducing a drawing - Syukri

• Proposes a system where authentication is conducted by having user drawing their signature using mouse.

• Have two stages, registration and verification.

• registration stage: user will first be asked to draw their signature with mouse, and then the system will extract the signature area and either enlarge or scale-down signatures, rotates if needed, (also known as normalizing).

• The verification stage:first takes the user input, and does the normalization again, and then extracts the parameters of the signature

• The information will later be saved into the database.

Reproducing a drawing - Passdoodle

• Reproduced by J.Goldberg et al (2002)

• This is a graphical password comprised of handwritten designs or text, usually drawn with a stylus onto a touch sensitive screen.

• the user study was done using paper prototype instead of computer programs, verifications were done by human rather than computer.

• accuracy of this study is still uncertain.

Recall based - reproducing a drawing

DAS(draw-a-screet) reproduced by Jermyn,et al(1999)

• Allow user to draw their unique password

• based on a two dimensial grid,user have to draw something to represent their password.

• Each of the grid coordinates from the drawn pictures is stored in the order of the drawing.

• User need to redraw again to be authenticated

• If the drawing lines up at the same grids coordinates with the proper sequence,then the user is authenticated.
  

DAS

graphical password

apakah itu "graphical password"?
Graphic password atau katalalauan berasaskan grafik ialah salah satu alternatif untuk menggantikan katalaluan berasaskan teks.Ini kerana terdapat kajian yang menyatakan bahawa manusia lebih mudah mengingati imej berbanding teks.Graphic password juga dikenali sebagai graphical user authentication(GUA) dimana pengguna dikehendaki memilih imej daripada pelbagai imej yang disediakan sebagai katalaluan mereka melalui Graphical user interface(GUI).



Idea graphical password disuarakan oleh Blonder pada tahun 1996.Pendekatannya ialah pengguna akan klik pada bahagian gambar yang dipaparkan pada skrin sebagai katalaluan mereka.JIka pengguna klik pada bahagian gambar yang betul maka pengguna boleh memasuki sistem dan sebaliknya.

Terdapat 2 teknik yang boleh digunakan iaitu Recognition-based dan Recall-based.

1.Recognition-based - pengguna akan disediakan dengan satu set imej di mana pengguna akan berjaya memasuki sistem dengan mengenali dan mengenalpasti imej yang dipilih semasa proses pendaftaran.

2.Recall-based - pengguna mengemaskini semula imej yang dipilih semasa proses pendaftaran.

Jadual di atas adalah scheme dan method yang digunakan di dalam graphical password.

tq miss Hazinah..

~happy coz dh dpt supervisor n tq so much to miss Hazinah bcz accept me n weng..:-) Tugasan dh diberi so wish us good luck~

happy new year!!!