The need for protection of our files and personal computers (PC) against unwanted intruders is increasing at an alarming rate every day. Luckily there are free open source software programs such as TrueCrypt that allows for file encryption, and even for entire disks and volumes of information on your computer system. With this innovative software, huge chunks of documents, applications, and programs can easily be hidden from view. Users can even encrypt their entire operating system.
*** TrueCrypt discontinued in 2014. Here are some free alternatives.