The other is just general computing horsepower of the sort found in supercomputers. These are legitimate concerns. The U.S. government's current law regarding encryption is especially peculiar and has already created some distortions in the market. If these laws are left unchanged, the U.S. will soon find itself severely and perhaps permanently lagging behind the rest of the world in encryption technology. The law itself goes something like this.
Encryption is lumped into two categories, weak and strong.
Both levels are regulated and may not be exported without a license. Strong encryption software, on the other hand, is classified as a munition. As such, it may be used for domestic communications but it may not be used for international communications or exported without a license, and such a license is much harder to get than one for weak encryption. Acquiring a license to export the source code for any level of encryption software is extremely difficult. Recently, the existence of such a key has become a condition for obtaining a license to export strong encryption software.