What: obfusc
 Where: ftp://ftp.procplace.com/pub/tcl/sorted/devel/obfusc-1.6.tar.gz 
 Description: Tcl/Tk program to obfuscate an input file, reversibly.
 Updated: 04/1999
 Contact: mailto:richard@prd.co.uk (Richard Ross-Langley)
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'''April 2004:''' the link is broken

But still can be found at [http://ftp.sunet.se/pub/lang/tcl/sorted/packages-8.0/devel/obfusc-1.6.tar.gz] ([EF])
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[Category Dev. Tools]