Originally posted by Aryan Khan: Any specific reasons for this?
Yes, encryption has long been considered a military item, goes back to Julius Caesar. Many governments don't want strong encryption to be used.
Breaking the enigma code by Brittan in WW2 was considered a major reason that they could survive until the US entered the war. Breaking the Japanese Purple code was also a major part of the war in the Pacific.
The laws have become more reasonable in recent years, but export of strong encryption is regulated in many countries. Use of strong encryption was illegal in a surprisingly large number of countries until recently. I haven't checked today, but it may still be illegal in some.
It is illegal for me, a US citizen in the US to even tell you how to get around the ITAR restrictions that the US places on crypto export.