Some of the smartest people in the history of the world were/are Russian. I'm not surprised by the USSR passport considering the other feats Russians have accomplished. I do know there are many ways to make something hard or impossible to counterfeit using steganographic techniques such as hidden watermarks and more but I do not know the specific Russian way to achieve it. I don't have the details and this is something you would probably know more about.
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no)
it's much easier;)
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTH8uDeJCx-bx3Ll_kicJXB1sVi8kgyo0c3reblrafmtXQoJrcS
The soviet clips were made of metal that rusts;)
spies always use metal that doesn't rust;)
i've discovred it recently, and it seems it's interesting and even funny to know:)
You know, this is also very true in general. If you see someone who you never seen before in your neighborhood, with brand new clothes, would you think they are some sort of undercover cop?
Most people don't have brand new anything and if everything looks like they just bought it then it stands out.
yes, right you're..
in such tiny things many main secrets of USSR are hidden.