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In my IoT project, I use the xxTEA encryption algorithm to encrypt my data. I use the same encryption key for all my packets because I don't have the possibility to do a key exchange between Alice and Bob.

I want to know how many packets it would take to deduce my key. I looked on the document of Alex Biryukov named "Differential cryptanalysis to ciphertext-only attacks" (https://link.springer.com/content/pdf/10.1007%2FBFb0055721.pdf) but I don't understand everything and can't find the calculation that gives me the result I'm looking for.

I send two packet per minute and I search to know how often do I have to change my key, before my encryption becomes insecure.

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  • $\begingroup$ Where in that document is xxTEA mentioned at all? $\endgroup$
    – President James K. Polk
    Commented Jun 10, 2021 at 1:53
  • $\begingroup$ Hello @PresidentJamesK.Polk, xxTEA isn't mentioned, but it's a cipher block encryption algorithm. So, I want to make the same calcul for xxTEA. Let me know if you have other questions :) $\endgroup$
    – nonmerci
    Commented Jun 10, 2021 at 10:30

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Elias Yarrkov published a Cryptanalysis of XXTEA (2010) citing about $2^{59}$ queries and negligible work is required for a chosen-plaintext attack.

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