With CHAOS+PK you can protect the privacy of your e-
mail messages and files by encrypting them so that
only the intended recipients can read them. You can
also digitally sign messages and files, which ensures
their authenticity. When someone sends you e-mail with
their digital signature, CHAOS automatically use a
copy of their public key to check the digital
signature and to make sure that no one has tampered
with the contents. After obtaining only one message
from other of CHAOS user enciphered by your public
key, the program independently shapes an one-time
symmetric key for operation with this user and in
further will use for operation with him only one-time
symmetric key varying at each conversation. Length of
these keys in each case will exceed a size of the
ciphered data.
The CHAOS+PK has two modes of operations.
When "Public Key" mode is turned on it is most
compact, reliable and simple in use program for
sending protected messages to the friends, colleagues
and bankers.
At the switched off mode "Public Key" is the most
reliable and fast program for enciphering the
information, which you are going to store on your
computer.

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