Make sure you read this about a cc2420 security issue
http://code.google.com/p/tinyos-main/issues/detail?id=34

2011.06.02. 9:54 keltezéssel, Jakob Bieling írta:
> Hi,
>
>    try "encryting" the cipher text again. The CC2420 AES works in CTR mode, 
> meaning encryption and decryption are the same operation.
>
>    Moreover, if you send your packets anyway, you can use the built-in 
> functionality of the CC2420 chip to encrypt all outgoing packets on the fly. 
> It will also decrypt incoming packets automatically. TinyOS already allows 
> for this, simply Google for "tinyos cc2420 security tutorial". Note that the 
> actual wiki seems to be down, but you use the Google cache. That worked for 
> me.
>
> Best,
> Jakob
>
>
> On Jun 2, 2011, at 9:07 AM, Damian Rusinek wrote:
>
>> Hello.
>> I'm using 'The Standalone AES Encryption of CC2420' which is described
>> here: 
>> http://cis.sjtu.edu.cn/index.php/The_Standalone_AES_Encryption_of_CC2420_(TinyOS_2.10_and_MICAz)
>>
>> I encrypt the payload of my packet before sending.
>> The question is how can I decrypt it?
>> Does anybody use this library?

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