All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
It is not permissible to lie about the circumstance mentioned in the question except if the Muslims are in a great need for this kind of expertise while other Muslims are not able to be admitted to it in order to fulfil the need, and the only way to be admitted to it is by lying.
The best thing in this case is to use Tawriyah (saying something which has more than one meaning and intending a meaning different from what the listener is likely to understand). This is discussed in Fatwa 88652 and 88695.
Allaah Knows best.