[erelde]

But passwords and hard drives are not documents. What's on it are "documents" but it's akin to refusing to pull memories out of your brain.

[harryh]

The purpose of the prohibition against testifying against oneself in the 5th amendment is not a protection of one's privacy (as many here seem to believe). It is to precent coerced false confessions. The difference between false testimony and a falsely revealed password is that the testimony is not obviously false but the password will be.