It can boot from a USB, you then use the computer, shut down, pull out the USB and no trace is left of what you did whilst you were on there (unless you deliberately saved a file to another USB or external drive). Just to comment on the mention that truecrypt contaiend the abiltity to have hidden operating systems, there is a linux thing called TAILS (the amnesic incognite live system) which can let you have a "secret operating system". 7z is free, and i think open source and unlikely to have a backdoor (but i can't absolutely be sure), it offers several different ways of encrypting files(AES 256 amongst many others) and perhaps the best part is that once encrypted you can treat the encrypted archive like a normal file (you can email it to people, put it on cd-rw's etc). ![]() I use 7z for this, as my windows version doesn't allow users to make password protected zip files, and it works well I don't know how effective it's encryption type is, and i don't know whether it offers any fancy features (7z is primarily a file compression and archiving program) but it does work. I'm no expert in the details of encryption but i find one of the most logicsl things to do for files that need to be private is put them in an encrypted archive, an archive that can be copied, pasted, opened, closed, extracted, transferred or deleted just like any zip file.
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