vb.net barcode component Importing Public Keys in Software

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Importing Public Keys
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First, however, you will need to make sure that you have the signer s public key The digital signature was encrypted with the software distributor s private key; that distributor is the signer Once you have that signer s public key, you can check any data you receive from them In the case of third-party software repositories such as freshrpmsnet, you will be asked to install their public key the first time you try to install any software from their site Once the key is installed, you do not have to install it again With Yellowdog Updater Modified (Yum), this is usually just a prompt to install the key, requesting a y or n confirmation, or it s a dialog, requesting an OK click Repositories such as Livna and Fresprmsnet will include their keys with their Yum configuration packages You can also, if you wish, download and install them manually from their websites In the case of a software distributor, you can download their public key from their website or from their keyserver Once you have their public key, you can check any software they distribute As noted previously, you can download the Red Hat public key from the Red Hat website security resources page or use the version installed in the Red Hat Package Manager (RPM) documentation directory Once you have obtained the public key, you can add to your keyring with the -import option, specifying the name you gave to the downloaded key file (in this case, myredhatasc):
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# gpg -import redhatasc gpg: key CBA29BF9: public key imported gpg: Total number processed: 1 gpg: imported: 1 (RSA: 1)
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To download from a keyserver instead, you use the --keyserver option and the keyserver name To import the Red Hat public key from the RPM directory, you specify the file This is the key provided by the Red Hat distribution on your DVD-ROM or CD-ROMs Though used during installation, the key has to be imported to verify packages again after they have been installed
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rpm --import /usr/share/doc/rpm-422/RPM-GPG-KEY
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Validating Public Keys
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You can use the --fingerprint option to check a key s validity, if you wish If you are confident that the key is valid, you can then sign it with the --sign-key command In the following example, the user signs the Red Hat key, using the string Red Hat in the key s name to reference it The user is also asked to enter his or her passphrase to allow use of his or her private key to sign the Red Hat public key
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# gpg --sign-key "Red Hat" pub 1024R/CBA29BF9 created: 1996-02-20 expires: never trust: -/q (1) Red Hat Software, Inc <redhat@redhatcom> pub 1024R/CBA29BF9 created: 1996-02-20 expires: never trust: -/q Fingerprint: 6D 9C BA DF D9 60 52 06 23 46 75 4E 73 4C FB 50 Red Hat Software, Inc <redhat@redhatcom> Are you really sure that you want to sign this key with your key: "Richard Petersen (author) <richlp@turtlemytrekcom>" Really sign yes You need a passphrase to unlock the secret key for user: "Richard Petersen (author) <richlp@turtlemytrekcom>" 1024-bit DSA key, ID 73F0A73C, created 2001-09-26 Enter passphrase: #
Checking RPM Packages
RPM packages from any Yum or Apt repository will check the public key automatically Should you download an RPM package separately, you can check the package manually Once you have the software provider s public key, you can check any RPM software packages with the rpm command and -K option The following example checks the validity of the xcdroast software packages:
# rpm -K xcdroast-098alpha9-1i386rpm xcdroast-098alpha9-1i386rpm: md5 OK
Many software packages in the form of compressed archives, targz or tarbz2, will provide signatures in separate files that end with the sig extension To check these, you use the gpg command with the --verify option For example, the most recent Sendmail package is distributed in the form of a compressed archive, targz Its digital signature is provided in a separate sig file First you download and install the public key for Sendmail software obtained from the Sendmail website (the key may have the year as part of its name)
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