Securing Cooperative Spectrum Sensing against DC-SSDF Attack Using Trust Fluctuation Clustering Analysis in Cognitive Radio Networks

Procedure 3

Binary clustering algorithm.

Intput:  C, , and ;

Output:  the set of DC-SSDF attackers () and honest SUs ();

(1) Randomly select an element from and respectively and use their trust vector as the initial mean vector ;

(2) repeat

(3) Initialize ;

(4) for    do

(5)Measure the distance between and () with equation (11);

(6)if    then

(7);

(8)else

(9);

(10)end if

(11) end for

(12) for    do

(13)Calculate the new mean vector  ;

(14)if     then

(15)Update ;

(16)else

(17)Keep the current mean vector unchanged;

(18)end if

(19) end for

(20) until the current mean vector is not updated again