bug#6315: 24.0.50; nothing about encryption in manuals, but in Dired

[Drew Adams]

emacs -Q
 
In Dired, Operate menu, I see these items:
 
Encrypt, Sign, Verify, Decrypt
 
But `i' in the Emacs manual and the Elisp manual finds nothing for
"encrypt".  Searching for "encrypt" doesn't help with this.
 
Presumably, this is something fairly important.  Shouldn't it be
mentioned in the manual?  We cover things like compression (e.g. in node
`Operating on Files').  Seems like encryption should be covered too.
 

In GNU Emacs 24.0.50.1 (i386-mingw-nt5.1.2600)
 of 2010-05-23 on G41R2F1
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --no-opt --cflags -Ic:/xpm/include'