A Location Prediction-Based Helper Selection Scheme for Suspicious Eavesdroppers

Algorithm 1

The risk prediction rule.

Initialization:

  ;

  ;

  .

Calculate transition probabilities by ;

Calculate step transition matrix , ;

Calculate the predicted probabilities ;

Set

  ( are sequence numbers of unreachable states);

Find ()

Calculate with ;

  if    then

 Take security measures against Eve;

  else

 Break;

 end if

 Modify for the next time prediction.