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==== Brute force ====
To provide a brute force attack, an attacker has to test all possible keys (all possible values of weights wij). By K hidden neurons, K*N input neurons and boundary of weights L, this gives (2L+1)<sup>KN</sup> possibilities. For example, the configuration K = 3, L = 3 and N = 100 gives us 3*10<sup>253</sup> key possibilities, making the attack impossible with today’s computer power.
==== Learning with own tree parity machine ====
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