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To check the digital signature of the file, you use the gpg command with the --verify option. This assumes that the sender has signed the file:
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gpg --verify myfile.asc
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However, you will need to have the signer's public key to decode and check the digital signature. If you do not, you will receive a message saying that the public key was not found. In this case, you will first have to obtain the signer's public key. You could access a key server that you think may have the public key, or request the public key directly from a Web site or from the signer. Then import the key as described previously. You do not have to encrypt a file to sign it. A digital signature is a separate component. You can either combine the signature with a given file, or generate one separately. To combine a signature with a file you generate a new version that incorporates both. Use the --sign or -s commands to generate a version of the document that includes the digital signature. In the following example, the mydoc file is digitally signed with mydoc.gpg file containing both the original file and the signature.
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gpg -o mydoc.gpg --sign mydoc
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If, instead, you want to just generate a separate signature file, you use the --detach-sig command. The signature file usually has an extension like .sig. This has the advantage of not having to generate a complete copy of the original file. That file remains untouched. In the following example, the user creates a signature file called mydoc2.sig for the mydoc2 file.
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gpg -o mydoc2.sig --detach-sig mydoc2
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To verify the file using a detached signature, the recipient user specifies both the signature file and the original file.
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mydoc2
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You could also generate a clear sign signature to be used in text files. A clear sign signature is a text version of the signature that can be attached to a text file. The text file can be further edited by any text editor. Use the --clearsign option to create a clear signature. The following example creates a clear signed version of a text file called mynotice.txt.
gpg -o mysignotice.txt --clearsign mynotice.txt
Note Numerous GUI front ends and filters are available for GnuPG at www.gnupg.org. GPA (GNU Privacy Assistant) provides a Gnome-based front end to easily encrypt and decrypt files. You can select files to encode, choose the recipients (public keys to use), and add a digital signature if you wish. You can also use GPA to decode encoded files you receive. You can also manage your collection of public keys, the keys on your keyring file. Tip Steganography is another form encryption that hides data in other kinds of objects such as images. You can use JPEG Hide and Seek software (JPHS) to encode and retrieve data in a JPEG image (jphide and jpseek). See linux01.gwdg.de/~alatham/stego.html for more details.
Checking Software Package Digital Signatures
One very effective use for digital signatures is to verify that a software package has not been tampered with. It is feasible that a software package could be intercepted in transmission and some of its system-level files changed or substituted. Software packages distributed by Red Hat, as well as those by reputable GNU and Linux projects, are digitally signed. The signature provides modification digest information with which to check the integrity of the package. The digital signature may be included with the package file or posted as a separate file. You use the gpg command with the --verify option to check the digital signature for a file. 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 a software distributor, once you have their public key, you can check any software they distribute. To obtain the public key, you can check a key server or, more likely, check their Web site. You can download the Red Hat public key from the Red Hat Web site at http://www.redhat.com/about/contact.html, as noted previously. Once you have downloaded 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, myredhat.asc):
# gpg --import redhat.asc gpg: key CBA29BF9: public key imported gpg: Total number processed: 1 gpg: imported: 1 (RSA: 1)
To download from a key server instead, you use the --keyserver option and the keyserver name. 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.
# gpg --sign-key "Red Hat" pub 1024R/CBA29BF9 created: 1996-02-20 expires: never trust: -/q (1). Red Hat Software, Inc. <redhat@redhat.com> 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@redhat.com> Are you really sure that you want to sign this key with your key: "Richard Petersen (author) <richlp@turtle.mytrek.com>" Really sign yes You need a passphrase to unlock the secret key for user: "Richard Petersen (author) <richlp@turtle.mytrek.com>" 1024-bit DSA key, ID 73F0A73C, created 2001-09-26 Enter passphrase: #
Once you have the public key, you can check any RPM software packages for Red Hat with the rpm command and -K option. The following example checks the validity of the xcdroast and balsa software packages:
# rpm -K xcdroast-0.98alpha9-1.i386.rpm xcdroast-0.98alpha9-1.i386.rpm: md5 OK # rpm -K balsa-1.1.7-1.i386.rpm balsa-1.1.7-1.i386.rpm: md5 OK
Many software packages in the form of compressed archives, .tar.gz or tar.bz2, will provide signatures in separate files that end with either the .asc or .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, .tar.gz. Its digital signature is provided in a separate .sig file. First, you would download and install the public key for sendmail software obtained from the Sendmail Web site.
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