suggest a project idea for cryptography using matlab

Hi,
please go through these threads, some topics related to cryptography have been listed:
http://studentbank.in/report-ultimate-mi...ngineering
http://studentbank.in/report-dsp-project-ideas
http://studentbank.in/report-digital-ima...8#pid29878

Some other topics are:
implementation of elgamal elliptic curve cryptography using
Halftone Visual Cryptography Using Matlab
Hill cipher using matlab