Generation of encryption keys
-----------------------------------
gpg --gen-key
gpg (GnuPG) 1.4.5; 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
= key expires in n days
w = key expires in n weeks
m = key expires in n months
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)
"
Real name: learnadmin
Email address: admin@learnadmin.com
Comment: this is comment section
You selected this USER-ID:
"learnadmin (this is comment section)
"
Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? o
You need a Passphrase to protect your secret key.
----------------
Here give password which is used for decryption of files. ( my testpassphrase is test@123 )
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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.
.++++++++++++++++++++++++++++++.+++++++++++++++.+++++++++++++++...++++++++++++++++++++++++++++++++++++++++..+++++..+++++..++++++++++++++++++++.+++++..........+++++
Not enough random bytes available. Please do some other work to give
the OS a chance to collect more entropy! (Need 162 more bytes)
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: /home/username/.gnupg/trustdb.gpg: trustdb created
gpg: key 4F13D8CF 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: 1 signed: 0 trust: 0-, 0q, 0n, 0m, 0f, 1u
pub 1024D/4F13D8CF 2014-03-10
Key fingerprint = BB11 7A85 CC87 55D2 6F35 D34C CD32 5F04 4F13 D8CF
uid learnadmin (this is comment section)
sub 2048g/5A897101 2014-03-10
------------------------
Tip for creating random key for cert generation :
Depending on your disk type
dd if=/dev/sda of=/dev/zero
(or)
dd if=/dev/hda2 of=/dev/zero
2911235+0 records in
2911234+0 records out
1490551808 bytes (1.5 GB) copied, 8.24918 seconds, 181 MB/s
The above command with take input form your disk and writes it randomly to /dev/zero
---------------------------
gpg --import Yourkey.gpg ( not required . This key need to be imported if you are using this encryption on other server or other client )
Create a file test.txt and try to encrypt and check if it is working ...!!
gpg --always-trust --encrypt --recipient "learnadmin (this is comment section) " test.txt
gpg --batch --passphrase test@123 --decrypt test.txt.gpg>test.txt