KGB Archiver a tool similiar to other compression tools like 7zip and UHARC having an unbelievably very high compression rate. It can compress your data upto 100 times i.e. You can compress a 1 GB file into 10 MB very easily.
It is an Open Source tool, available for free of cost. This amazing tool uses AES-256 encryption which is one of the strongest encryption known ever to compress archives as well as decompress archives.
Its minimum hardware requirement are 1.5 GHz processor and 256MB of RAM.
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With the amazing high compression power as well as very accurate results of this tool, there is no loss of data during compression.