{"id":1085,"date":"2010-01-19T14:50:13","date_gmt":"2010-01-19T09:05:13","guid":{"rendered":"https:\/\/www.sparksupport.com\/blog\/?p=1085"},"modified":"2024-06-26T12:21:02","modified_gmt":"2024-06-26T12:21:02","slug":"gnupg-basics","status":"publish","type":"post","link":"https:\/\/sparksupport.com\/blog\/gnupg-basics\/","title":{"rendered":"GnuPG Basics"},"content":{"rendered":"

GnuPG<\/strong>
\nGnuPG is a free software for secure communication. GnuPG itself is a communication tool without any graphical support. GnuPG uses non-patent algorithms such as DSA,RSA, ElGamal and RSA,CAST5, Camellia, Triple DES, AES, Blowfish etc.<\/p>\n

Features<\/strong>
\nDoes not use any patented algorithms.
\nGPLed, written from scratch.
\nSupports key and signature expiration dates.
\nOnline help<\/a> system.<\/p>\n

Process<\/strong>
\nGnuPG encrypts data using\u00a0 key pairs. Each user has a key pair. A message encrypted with a recipient’s public key cannot be decrypted by anyone except the matching private key. Public key can be shared with\u00a0 other users.<\/p>\n

Here you will see how to create keys and how to use it for data encryption and decryption.<\/p>\n

Generating a new keypair<\/strong><\/p>\n

Use –gen-key option to create a key pair.<\/p>\n

[bash]
\ngpg –gen-key
\n[\/bash]<\/p>\n

You have to selet the type of key<\/p>\n

[bash]
\nPlease select what kind of key you want:
\n(1) DSA and Elgamal (default)
\n(2) DSA (sign only)
\n(5) RSA (sign only)
\nYour selection?
\n[\/bash]<\/p>\n

You have to specify the key pair size<\/p>\n

[bash]
\nWhat keysize do you want?
\n[\/bash]<\/p>\n

Then you have to specify expiration date<\/p>\n

[bash]
\nPlease specify how long the key should be valid.
\n0 = key does not expire
\n<n> = key expires in n days
\n<n>w = key expires in n weeks
\n<n>m = key expires in n months
\n<n>y = key expires in n years
\nKey is valid for? (0)
\n[\/bash]<\/p>\n

You must also provide a USER ID. You need a User-ID to identify your key;<\/p>\n

[bash]
\nfrom Real Name, Comment and Email Address in this form:
\n“Heinrich Heine (Der Dichter) <heinrichh@duesseldorf.de>”<\/p>\n

Real name:
\n[\/bash]<\/p>\n

GnuPG need a Passphrase to protect your private key.<\/p>\n

[bash]
\nEnter passphrase:
\n[\/bash]<\/p>\n

Now you have successfully create the keys. To list keys use the commandline option –list-keys<\/p>\n

[bash]
\ngpg –list-keys
\n\/users\/user\/.gnupg\/pubring.gpg
\n—————————————
\npub 1024D\/BB7576AC 2010-06-04 Alice (Judge) <user@exp.org>
\nsub 1024g\/78E9A8FA 2010-06-04
\n[\/bash]<\/p>\n

.
\nEncrypting and decrypting documents<\/strong><\/p>\n

The –encrypt(-e) option is used to encrypt files.<\/p>\n

[bash]
\ngpg –output doc.gpg –recipient user@exp.org \u2013-encrypt mydoc
\n[\/bash]<\/p>\n

Note if you are not specify ouput filename default name will be mydoc.asc<\/p>\n

The \u2013-recipient(-r) option is also important which specify the public key to which the key should encrypt.<\/p>\n

By default there is only one public key but when we encrypt files for someone else we have to import their public key using SOFTWARE DEVELOPMENT SERVICES INDIA<\/a><\/p>\n

[bash]
\ngpg –import key_file_to_import
\n[\/bash]<\/p>\n

Then to encrypt<\/p>\n

[bash]
\ngpg -r someone@email.com -e file_to_encrypt
\n[\/bash]<\/p>\n

To decrypt the file you can use the –decrypt option. You need the private key to which the message was encrypted.<\/p>\n

[bash]
\ngpg –output doc –decrypt mydoc.asc
\nEnter passphrase:
\n[\/bash]<\/p>\n

Hope this artticle will help you to getting started\u00a0 GnuPG.<\/p>\n","protected":false},"excerpt":{"rendered":"

GnuPG GnuPG is a free software for secure communication. GnuPG itself is a communication tool without any graphical support. GnuPG uses non-patent algorithms such as<\/p>\n","protected":false},"author":14,"featured_media":5104,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[6],"tags":[147],"class_list":["post-1085","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","tag-gnupg-basics"],"acf":[],"yoast_head":"\nGnuPG Basics - steps and featured discription for users<\/title>\n<meta name=\"description\" content=\"The GnuPG Guide is a free software for secure communication. 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