Quote from: Ben on June 16, 2012, 01:58 amIts nice if you like gimmicks, nothing more.Wax seals aren't that secure at all - you could do simple cast of the seal before opening the device and later re-cast that seal without leaving any obvious traces. If you wanted to send someone data by snailmail, just encrypt that data using their public key, or a secretly communicated key. There really is no point relying on physical protection mechanisms when the tools for strong cryptography are available to you free of charge.Thanks Ben, I was actually thinking of sending contraband like drugs and weapons in the mail rather than data but yes, I see your point about a seal being easy to imitate. OZ's suggestion is a much better idea!V.