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safety outside of Europe and ETSI at sea. They've introduced TEA5 and TEA6 and TEA7 algorithm to modernize the standard. And Tetra basically uses a cellular type of approach to keys and authentication. So things are usually housed on a sim inside the radio. And that's basically where it gets everything, the cipher key, et cetera, et cetera. I suppose now you can have virtual sims on Tetra radios, but traditionally they've been physical sims like cell phones.