[citation][nom]cj_online[/nom]This would really be useful for businessmen, if it wasn't a swiff knife. They don't allow that on planes.. do they ? ie in ur hands and not in the storage/luggage.[/citation]
I was just thinking the same thing - this is great until you try to go through any US airport security check point with it (and you bottle of hand lotion, and your laptop, and you nail clippers, and your shoes, and soon your underwear, hair, a smile, teeth, breast/penile implants, or you critical heart/diabetes medications).
Also, I am in the camp of "unhackable" meaning not yet hacked. As to the thumb idea, sure you could try to get away with that at a contest - but is the jail term you are going to get worth the money? (Outside the contest, isn't there any easier way to do it than cutting off a thumb? I am sure there is, as there are better points of attack - like buying the person a few drinks and getting them to show off their "super secret" data.)