Abstract: This invention concerns a method and system for improving the security of transaction in an emulated Integrated Circuit. The present invention proposes a method directed for proposing counter-measures against data lifting and code-lifting for dynamically linked native library of a mobile application. The result of the countermeasures method implemented are used as input to compute a countermeasure value which may be used as input during the computation of the cryptogram. If the native shared library is compromised, the computed countermeasure value is wrongly computed. With the wrongly computed cryptogram, the transaction will be rejected at the remote computer side. With the present invention, none stop condition is inserted into the mobile application when the native library is compromised.