How to encrypt and decrypt a file in Linux.


There are two commands which do the encryption and decryption of file in Linux. This will be more helpful when you carry confidential data in Laptop or pendrive.

1. Mcrypt is the command for encrypt the file and mdecrypt is the command for decrypt the file.

Eg:

# cat test.txt

password: test123

# mcrypt test.txt

Enter the passphrase (maximum of 512 characters)

Please use a combination of upper and lower case letters and numbers.

Enter passphrase:

Enter passphrase:

File test.txt was encrypted.

# rm test.txt

# ls -l test*

-rw——- 1 root root 125 2012-08-23 15:59 test.txt.nc

# mdecrypt test.txt.nc

Enter passphrase:

File test.txt.nc was decrypted.

# cat test.txt

password: test123

#

2. Similarly gpg is the command for encrypting and decrypting a file.

Syntax :

a. #gpg –c filename, This will create a gpg extension at the end of the file similarly like nc mentioned above in the example.

b. #gpg –d filename which will decrypt the file.

 

3. For Windows you can use the gpg software:- http://gpg4win.org/

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