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WhisperCore [1], developed by Moxie Marlinspike [2], solves this problem for Android users...

[1] http://www.whispersys.com/screenlock.html

[2] http://news.ycombinator.com/item?id=2609037

This is an interesting product. It seems to only be officially supported on the Nexus One and Nexus S (and Android 2.3) at the moment, but it sounds like more devices are in the works.

Their WhisperCore product has two alternative screenlocks that basically use additional (thumb) smudges to remove evidence.

Sounds like WhisperCore also uses AES-256 for device encryption. Which is killer. I can't wait to see how this product develops over the next couple months.

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