Encrypt RF message

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Hi!

I have an Arduino Uno with the simple 1$ RF transmitter/receiver which you can find everywhere. Is there an function or library to encrypt the message? Doesn't need to be 128bits AES but some kind of encryption. Or is there some nice code example for this?

Thanks,
Kalekulan

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The Block TEA (Tiny Encryption Algorithm) is supposed to be very secure. Both C and Java versions are discussed and available here: Block TEA ‘Tiny Encryption Algorithm’ (xxtea) implemented in JavaScript

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