What archivers provide the best encryption?
Among three most popular archivers – ARJ, ZIP and RAR – the RAR 3.x provides the strongest encryption, because it implements the standard and strong AES algoritm, has the slowest brute-force rate. But the possible weakness of RAR is that the program sources is not public domain. The implementation has never been tested by professional cryptographers. Among the archivers using strong algorithms and with available source codes the 7-Zip archiver can be marked out, but it is not known for sure whether it has ever been analised cryptographically.