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I'd like to send sensor values over ethernet shield to a webserver. But for this I'd like to encrypt the data on the arduino and decrypt it on the webserver (PHP). Do you have any suggestions or examples?

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1 Answer 1

XTEA is probably your best bet. It's lightweight, easy to implement, and secure enough for a bit of sensor data...

There's also the slightly more complex, and also slightly more secure, XXTEA:

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