gpg加解密教程

我們輸入下列指令檢視本機是否安裝

　　Linux$rpm-qa│grep gnupg 　　gnupg-1.4.5-11 　　說明已經安裝 接下來生成密鑰  

[root@localhost tmp]# 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.

gpg: directory `/root/.gnupg' created

gpg: new configuration file `/root/.gnupg/gpg.conf' created

gpg: WARNING: options in `/root/.gnupg/gpg.conf' are not yet active during this run

gpg: keyring `/root/.gnupg/secring.gpg' created

gpg: keyring `/root/.gnupg/pubring.gpg' created

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)

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) <[email protected]>"

Real name: kingsoft

Email address: [email protected]

Comment: kingsoft

You selected this USER-ID:

    "kingsoft (kingsoft) <[email protected]>"

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

++++++++++.+++++++++++++++.++++++++++..++++++++++..++++++++++++++++++++++++++++++++++++++++.+++++.

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

+...........................+++++^^^

gpg: /root/.gnupg/trustdb.gpg: trustdb created

gpg: key ECA840EB 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/ECA840EB 2012-07-02

      Key fingerprint = 8090 3DC7 C054 ABD0 C51F  25DC 5FB6 882D ECA8 40EB

uid                  kingsoft (kingsoft) <[email protected]>

sub   2048g/3DF27DB5 2012-07-02

[root@localhost tmp]# ls

cront.1427  kfs_result

導出公鑰

[root@localhost tmp]# gpg --export --armor kingsoft > gpgkey.pub.asc  (kingsoft根據自己前面取的real name 修改)

cront.1427  gpgkey.pub.asc  kfs_result

導出私鑰

[root@localhost tmp]# gpg -o seckey.asc --export-secret-keys kingsoft  (kingsoft根據自己前面取的real name 修改)

在其他機器上面，上傳gpgkey.pub.asc  與 seckey.asc

[root@localhost tmp]# gpg --import gpgkey.pub.asc

添加信任kingsoft名字

[root@localhost tmp]# gpg --edit-key kingsoft

Secret key is available.

pub  1024D/ECA840EB  created: 2012-07-02  expires: never       usage: SC 

                     trust: ultimate      validity: ultimate

sub  2048g/3DF27DB5  created: 2012-07-02  expires: never       usage: E  

[ultimate] (1). kingsoft (kingsoft) <[email protected]>

Command> trust

Please decide how far you trust this user to correctly verify other users' keys

(by looking at passports, checking fingerprints from different sources, etc.)

  1 = I don't know or won't say

  2 = I do NOT trust

  3 = I trust marginally

  4 = I trust fully

  5 = I trust ultimately

  m = back to the main menu

Your decision? 5

Do you really want to set this key to ultimate trust? (y/N) y

Command> quit

現在我們在這台機器上進行加密檔案操作

[root@localhost tmp]# cat zk.txt

test

zhangkai

zk.txt

[root@localhost tmp]# gpg -e -r kingsoft zk.txt

[root@localhost tmp]# ls

zk.txt  zk.txt.gpg

zk.txt.gpg即是加密後的檔案

現在我們在這台機器上進行解密檔案操作

[root@localhost tmp]# gpg --import seckey.asc

[root@localhost tmp]# gpg -o 123.txt -d zk.txt.gpg （-o 指定解密後的檔案名）