09-10-2003
How are you entering the command? Vi has a -x option for encryption. Check that you don't have vi as an alias for vi -x (use the alias command.
From the vi man page:
-x Encryption option; when used, vi simulates the X com-
mand of ex and prompts the user for a key. This key is
used to encrypt and decrypt text using the algorithm
of the crypt command. The X command makes an educated
guess to determine whether text read in is encrypted
or not. The temporary buffer file is encrypted also,
using a transformed version of the key typed in for
the -x option. If an empty encryption key is entered
(that is, if the return key is pressed right after the
prompt), the file will not be encrypted. This is a
good way to decrypt a file erroneously encrypted with
a mistyped encryption key, such as a backspace or undo
key.
If the file is encrypted, then you will not see the file correctly if you just do a regular vi on it (the text will still be encrypted).
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crypt(1) General Commands Manual crypt(1)
NAME
crypt - encode/decode
SYNOPSIS
crypt key < input.File > output.File
DESCRIPTION
The command reads from the standard input and writes on the standard output. You must supply a key which selects a particular transforma-
tion. If no password is given, demands a key from the terminal and turns off printing while the key is being typed in. The command
encrypts and decrypts with the same key.
Files encrypted by are compatible with those treated by the ed, ex and vi editors in encryption mode.
The security of encrypted files depends on three factors: the fundamental method must be hard to solve, direct search of the key space must
be infeasible, and sneak paths by which keys or clear text can become visible must be minimized.
The command implements a one-rotor machine designed along the lines of the German Enigma, but with a 256-element rotor. Methods of attack
on such machines are known, but not widely; moreover the amount of work required is likely to be large.
The transformation of a key into the internal settings of the machine is deliberately designed to be expensive, for example, to take a sub-
stantial fraction of a second to compute. However, if keys are restricted to three lowercase letters, then encrypted files can be read by
expending only a substantial fraction of five minutes of machine time.
Since the key you choose is an argument to the command, it is potentially visible to users executing the command or a derivative. To mini-
mize this possibility, destroys any record of the key immediately upon entry. The most vulnerable aspect of is the choice of keys and key
security.
EXAMPLES
The following examples use KEY as the key to encrypt and decrypt files. The first example encrypts the file naming the resulting encrypted
file The second example decrypts the file naming the resulting decrypted file The third example prints the encrypted file in clear text. $
crypt KEY < plain.File > crypt.File $ crypt KEY < crypt.File > decrypt.File $ crypt KEY < crypt.File | pr
FILES
for typed key
RELATED INFORMATION
ed(1), ex(1), vi(1), crypt(3), makekey(8) delim off
crypt(1)