For those of us who are crossing borders and worried about laptop searches, I thought I'd post some links to useful resources to keep private material private. Obviously, this is not intended to help conceal criminal activity (e.g. illegal pr0n, bomb manuals, stuff like that), but say you've ripped a DVD to watch on the plane and don't feel like having to argue with an overzealous ICE official about copyright, some of these could come in handy. TrueCrypt (TrueCrypt.org) - Create a virtual disk storage container (image) and apply a wide variety of encryption algorithms to it. Useful in that it can create an unlimited number of nested hidden storage containers, one within the next, without any indication that they're there. Create a regular container and put some bank statements and the occasional "embarrassing" picture (think lingerie/beach photos) inside, then create the hidden partition and put whatever it is you want to keep really private inside that one. Worried about TSA clerks or ICE agents being wise to TC? Nest them as deep as you want, so long as you have the disk space. GPG (GnuPG.org) - FLOSS (Free/Libre Open Source Software) alternative to PGP, used for single-file encryption and digital signatures. Will integrate with E-mail programs (Enigmail for Thunderbird, see here for Outlook) for secure E-mail transmission. GUI frontends are available but it helps to get comfy with a CLI for this one. Enigmail - Plugin for Mozilla Thunderbird & Mozilla Seamonkey that enables encrypted E-mail transmission. Useful for confidential corporate messages sent/received while on unknown networks, either abroad or at the airport. Anyone, feel free to add more that you think would be useful. Doesn't have to be crypto/stego related, just felt I should start there since we care about real security.