They basically half the symmetric keyspace (but there could be better, more specialized quantum algorithms), and the next smallest keysize is usually 128 bit. S

They basically half the symmetric keyspace (but there could be better, more specialized quantum algorithms), and the next smallest keysize is usually 128 bit. So that's what most foreign encryption will use after this new law. A brute-force search of a 64 bit keyspace is no problem for a nation state like China.