Assertion: security system | /r/HasProperty | depend on the secrecy of a key
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Source sentences:
text: If the security of a scheme depends on the secrecy of a key for a pseudorandom function (PRF), then we may specify that the PRF key should be sampled from the space { 0 , 1 } κ {\displaystyle \{0,1\}^{\kappa }} brute-force search requires O ( 2 κ )