Install gcipher in Ubuntu
sudo aptitude install gcipher
This will complete the installation
Using gcipher
gcipher [CIPHEROPTIONS]... [INPUT] [OUTPUT]
gcipher Examples
Encrypt a file using the Gie cipher:
gcipher -c Gie inputfile outputfile
Decrypt STDIN and output to STDOUT using Rot13:
gcipher -C Rot -k 13
Listen on port 1027 and act as a proxy for port 1028 on gnu.org. Decrypt the data coming from gnu.org and encrypt data going to gnu.org using Vigenere with key linux:
gcipher -c Vigenere -k linux -p gnu.org 1028 1027
Available CIPHERS
Gie -- a simple cipher doable by hand; no key is required
Ceasar -- Julius Ceasar's code; no key is required
Rot -- linear rotation; the amount of the rotation is given by the key which must be a number in the range [0, 25]
Vigenere -- a version of ROT that uses a private key; the key must be made of lower-case letters
Available options
-c CIPHER -- encrypt using the given cipher
-C CIPHER -- decrypt using the given cipher
-k KEY -- set the key for the previous cipher
-p PROXIEDHOST PROXIEDPORT LISTENINGPORT -- act as a network proxy
gcipher GUI
If you want open GUI go to Applications--->Accessories--->GCipher
Once it opens you should see similar to the following screen
Now you need to select CIPHERS option
type the message you want to encrypt and click on encrypt
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