Send commands safely via an unencrypted channel

Abstract

it might be useful to send some commands to an in-field device via an unencrypted channel, for example via LoRa 868 Mhz radios. Low power long range units usually dont implement encryption. With this idea you can send commands safely without encryption.

The system uses OTP (One-Time-Pads). The sender and the reciever both use the same seed and Pseudo random number generator.

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How to: Tell that you had an idea first or: Timestamping with the blockchain

Abstract

Did you ever wanted to prove that you had an idea? Maybe before somebody else patented or published it? It might not help in front of a court, but it might help in front of your friends 😉

Here follows how to timestamp something in a very safe but open manner.

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