>Encrypted data is bits and bytes like everything else. You can compress it. You can "compress" anything, if one of the modes of your compressor is simply to s

>Encrypted data is bits and bytes like everything else. You can compress it. You can "compress" anything, if one of the modes of your compressor is simply to store the data "as is", but generally speaking encrypted data is indistinguishable from a random bit stream and cannot be compressed. If you think about it, one of the ways that compressors and attacks on encryption work is by looking for structure in the data. If you still have that after encryption, you don't have a good algorithm.