Cryptography is that area of expertise which deals with
secret writing, the art or science of storing
information in a form which hides it from those not
meant to see it, yet allows it to be revealed when
needed. Cryptosystem ME6 is a software program which
encrypts information stored in data files so that it
can be read only by someone who knows the encryption
key which was used to encrypt that data. The encryption
key is a word or phrase given to the program which it
uses to scramble the information in a way which is
unique for that key. Once encrypted, the data is secure
from unauthorized access, since anyone who does not
know the key cannot decrypt the data. When Cryptosystem
ME6 is used to recover the data the original key must
be specified. If the correct key is supplied then the
data is restored to its original form.

Cryptosystem ME6 uses a private (or symmetric) key
encryption system. Data is encrypted using a key which
is a phrase (which can be up to 64 characters long) or
a sequence of 64 random bytes. Without this key the
encrypted files appear to consist of meaningless bytes
and the information in them is safe from prying eyes.

Files are normally compressed before encryption. There
is no limit (except available disk space) on the size,
the type or the number of files which can be encrypted
in a single operation with ME6.

The encryption process in Cryptosystem ME6 uses
pseudo-random number generators, a secure hash function
(the MD5 Message Digest Algorithm) and plaintext
feedback, combined in a way to ensure the security of
the encrypted data. Data encrypted using ME6, even when
subjected to statistical analysis, appears to consist
of random bytes, providing no information.

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