[quanta@localhost ~]$ gpg --gen-key

 gpg (GnuPG) 1.4.7; Copyright (C) 2006 Free Software Foundation, Inc.

 This program comes with ABSOLUTELY NO WARRANTY.

 This is free software, and you are welcome to redistribute it

 under certain conditions. See the file COPYING for details.

 

 Please select what kind of key you want:

    (1) DSA and Elgamal (default)

    (2) DSA (sign only)

    (5) RSA (sign only)

 Your selection? 1

 DSA keypair will have 1024 bits.

 ELG-E keys may be between 1024 and 4096 bits long.

 What keysize do you want? (2048) 

 Requested keysize is 2048 bits

 Please specify how long the key should be valid.

          0 = key does not expire

       <n>  = key expires in n days

       <n>w = key expires in n weeks

       <n>m = key expires in n months

       <n>y = key expires in n years

 Key is valid for? (0) 0

 Key does not expire at all

 Is this correct? (y/N) y

 

 You need a user ID to identify your key; the software constructs the user ID

 from the Real Name, Comment and Email Address in this form:

     "Heinrich Heine (Der Dichter) <heinrichh@duesseldorf.de>"

 

 Real name: quanta

 Email address: <a href="mailto:quanta@love.com">quanta@love.com</a>

 Comment: Linux is my hobby

 You selected this USER-ID:

     "quanta (Linux is my hobby) <quanta@love.com>"

 

 Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? O

 You need a Passphrase to protect your secret key.

 

 We need to generate a lot of random bytes. It is a good idea to perform

 some other action (type on the keyboard, move the mouse, utilize the

 disks) during the prime generation; this gives the random number

 generator a better chance to gain enough entropy.

 ++++++++++++++++++++++++++++++++++++++++.+++++++++++++++++++++++++.+++++++++++++++...++++++++++++++++++++++++++++++.+++++++++++++++.+++++>.++++++++++....................................................................+++++

 We need to generate a lot of random bytes. It is a good idea to perform

 some other action (type on the keyboard, move the mouse, utilize the

 disks) during the prime generation; this gives the random number

 generator a better chance to gain enough entropy.

 .+++++.++++++++++++++++++++.++++++++++++++++++++.+++++++++++++++.+++++++++++++++..+++++++++++++++..+++++.++++++++++++++++++++++++++++++++++++++++++++++++++>....++++++++++>+++++................>.+++++.....................<..+++++............................................................+++++^^^

 gpg: key F5A60BA5 marked as ultimately trusted

 public and secret key created and signed.

 

 gpg: checking the trustdb

 gpg: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model

 gpg: depth: 0  valid:   2  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 2u

 pub   1024D/F5A60BA5 2007-12-11

       Key fingerprint = CE51 C39F 1D65 B1FF DAF2  B526 5F96 C546 F5A6 0BA5

 uid                  quanta (Linux is my hobby) <quanta@love.com>

 sub   2048g/A27B406C 2007-12-11

$ gpg --list-keys

 gpg: checking the trustdb

 gpg: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model

 gpg: depth: 0  valid:   1  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 1u

 /home/quanta/.gnupg/pubring.gpg

 -------------------------------

 pub   1024D/F5A60BA5 2007-12-11

 uid                  quanta (Linux is my hobby) <quanta@love.com>

 sub   2048g/A27B406C 2007-12-11

$ echo "I want to become a white-hat hacker" > wish.txt

$ gpg -ea -r quanta wish.txt

$ gpg -d wish.txt.asc > wish.txt

$ gpg --clearsign -a wish.txt