Last weekend I participated in Openhackday hosted by Yahoo! @ Taj residency and developed an application based on Redaction which won Best Confidential Messages award(an Ipod-touch :)).
Also some unforgettable moments like working on YUI with help of Chris Heilmann ;)
What I did?
I developed a small mail application which can be integrated in to yahoo mail using Yahoo's openmail APIs.Instead of encrypting the whole mail, this application allows user to select a particular word that should be encrypted using a user's key and at receiving end other user can view those words only by providing same key.
Example use case
A Manager wants his mail to be formatted by his secretary but doesn’t want her to see all the sensitive data in that mail.
A 3 min demo on what I did is available @ http://www.youtube.com/watch?v=4DMT_fN66oI
Event wiki & winners list: http://openhack2009.pbwiki.com/
Other applications that were demoed : http://developer.yahoo.com/openhack/show/2009/feb/openhackindia/
Some pics from event : http://www.flickr.com/search/?q=hackdayindia&d=taken-20090213-&ss=0&ct=0&w=all