Hi vietnq69, task for you
implement in java (with test code) xmss signatures
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You will need to look around the internet to find the algorithm. There may be code around already, I'm not sure.
It is apparently "a pretty simple algorithm", though you'll need javas AES cipher and SHA to complete it (you'll find code on the internet for that too)
The copyright for all delivered code, now and in the future, must belong to Axlacor Ltd.
Please put "Copyright 2015 Axlacor Ltd" this at the top of the java files you create.