@SECURE PARAMETER

• Determine the rigor of privacy amplification. When QBER<0.2, the safe_factor use the first value, otherwise use the second value.

safe_factor = s ; I(Eve_shannon_info) <= 2^(-s)ln(2)

• Is store as secure_parameter in the fortran code.

example

@SECURE_PARAMETER
30, 50

Which mean when @AUTO_PALENGTH is .true., the system will calculate key reduction rate with safe_factor=30 (if QBER<0.2) safe_factor=50 (if QBER>0.2).