Top 10 Secret Agent Security Tips and Tricks
When dealing with computer security, an often overlooked security risk is so-called "deleted files". When files are deleted, nothing is actually done to them aside from marking them as "free-space". The OS may get around to overwriting them sometime when it needs the space, but a deleted file could sit on a drive completely intact for weeks of usage (the bigger it is the bigger the chance it will be at least partially overwrited). Encryption applications that do not involve real-time decoding (a special driver decrypting files on-the-go vs an application decrypting and re-encrypting files), often do not have secure methods of wiping files (or the user is unaware of them), and hence the files are left in an unencrypted state on the drive when deleted. The only way to assure deleted files remain that way (or at least make their recovery very difficult and time-consuming) is to have an application overwrite the drives free-space with random 0s/1s, ideally multiple times.
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