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Software Vault: The Diamond Collection
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1994-11-06
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2KB
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38 lines
FCR
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FCR is a utility to create a "code-key" file. The code-key file is a set of
random integers, in the range of 0 to 26, that define the cross-alphabet
shift of each character in the text file to be encoded, and the reverse
shift of each character in the encoded file, in order for it to be decoded.
FCR is a part of the shareware *ONETIME* file security system.
To invoke FCR, type: fcr filename, where filename is the name of the file
which will be encoded. FCR will create a CODE.KEY file longer than the
length in bytes of that file. FCR will usually be invoked from the batch file
ENCODE.BAT, but can be used as a stand-alone utility.
FCR is used to encode and decode text files in a form suitable for hard-copy
or fax transmission. Use the companion utility FFCR to generate key-files
for more flexibly encoding both text and binary files, but in a form not not
necessarily reproducible on hard-copy output devices, such as printers or
fax machines.
Note that the length of the key-file will be greater than that of the file
to be encoded. Additionally, each particular key-file should be used once
only, otherwise the security of the encryption process is compromised. These
two measure ensure that no patterns will be discernible in the encrypted file
or message.
The C source for FCR is included. Use and modification of source requires
the written permission of the author, which will likely be granted on
request.
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M\Cooper
3425 Chestnut Ridge Rd.
Grantsville, MD 21536-9801
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Email: thegrendel@aol.com