If you have problem with yum install. [Trying other mirror.]
yum clean all rm -f /var/lib/rpm/__db* rpm --rebuilddb yum -y install yumex
Doesn't matter if you use yum -y install yumex or yum install yumex -y.
Thursday, August 30, 2012
YUM Install
Wednesday, August 1, 2012
PGP File Encryption
How to generate a key
$ gpg --gen-key
How to check installed keys
$gpg --list-keys
How to delete installed keys
first need to delete secret key
$ gpg --delete-secret-key prasad@gmail.com
Then delete the key
$ gpg --delete-key prasad@gmail.com
How to import a secret key
$ gpg --import public-key
When importing a public key onto another machine, you may have configure gpg to
trust the key. Otherwise, when you use the key to do encryption, you may
see a prompt like this:
It is NOT certain that the key belongs to the person named
in the user ID. If you *really* know what you are doing,
you may answer the next question with yes.
Use this key anyway? (y/N)
To trust the key, run:
gpg --edit-key NAME
GPG will output some information, and show a line like:
trust: undefined validity: unknown
You will be at a console, and you have to type "trust":
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
Encrypting and decrypting documents
$ gpg --output doc.gpg --encrypt --recipient blake@cyb.org doc
The --recipient option is used once for each recipient and takes an extra argument specifying the public key to which the document should be encrypted. The encrypted document can only be decrypted by someone with a private key that complements one of the recipients' public keys. In particular, you cannot decrypt a document encrypted by you unless you included your own public key in the recipient list.
To decrypt a message the option --decrypt is used. You need the private key to which the message was encrypted. Similar to the encryption process, the document to decrypt is input, and the decrypted result is output.
gpg --output doc --decrypt doc.gpg
You need a passphrase to unlock the secret key for
user: "Blake (Executioner) <blake@cyb.org>"
1024-bit ELG-E key, ID 5C8CBD41, created 1999-06-04 (main key ID 9E98BC16)
Enter passphrase:
Read more here
Download PGP for window form here
$ gpg --gen-key
How to check installed keys
$gpg --list-keys
How to delete installed keys
first need to delete secret key
$ gpg --delete-secret-key prasad@gmail.com
Then delete the key
$ gpg --delete-key prasad@gmail.com
How to import a secret key
$ gpg --import public-key
When importing a public key onto another machine, you may have configure gpg to
trust the key. Otherwise, when you use the key to do encryption, you may
see a prompt like this:
It is NOT certain that the key belongs to the person named
in the user ID. If you *really* know what you are doing,
you may answer the next question with yes.
Use this key anyway? (y/N)
To trust the key, run:
gpg --edit-key NAME
GPG will output some information, and show a line like:
trust: undefined validity: unknown
You will be at a console, and you have to type "trust":
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
Encrypting and decrypting documents
$ gpg --output doc.gpg --encrypt --recipient blake@cyb.org doc
The --recipient option is used once for each recipient and takes an extra argument specifying the public key to which the document should be encrypted. The encrypted document can only be decrypted by someone with a private key that complements one of the recipients' public keys. In particular, you cannot decrypt a document encrypted by you unless you included your own public key in the recipient list.
To decrypt a message the option --decrypt is used. You need the private key to which the message was encrypted. Similar to the encryption process, the document to decrypt is input, and the decrypted result is output.
gpg --output doc --decrypt doc.gpg
You need a passphrase to unlock the secret key for
user: "Blake (Executioner) <blake@cyb.org>"
1024-bit ELG-E key, ID 5C8CBD41, created 1999-06-04 (main key ID 9E98BC16)
Enter passphrase:
Read more here
Download PGP for window form here
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