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gpg -e -s -a -o myfileasc -r george@rabbitmytrekcom myfile # mail george@rabbitmytrekcom < myfileasc
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You can leave out the ASCII armor option if you want to send or transfer the file as a binary attachment Without the --armor or -a option, gpg generates an encoded binary file, not an encoded text file A binary file can be transmitted through email only as an attachment As noted previously, ASCII armored versions usually have an extension of asc, whereas binary version use gpg
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NOTE You can use gpgsplit to split a GPG message into its components to examine them
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When the other user receives the file, they can save it to a file named something like myfileasc and then decode the file with the -d option The -o option will specify a file to save the decoded version in GPG will automatically determine if it is a binary file or an ASCII armored version
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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
gpg --verify myfileasc
Decrypting a Digital Signature
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 can access a keyserver that you think may have the public key or request the public key directly from a website or from the signer Then import the key as described previously
Signing Messages
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 option to generate a version of the document that includes the digital signature In the following example, the mydoc file is digitally signed with mydocgpg file containing both the original file and the signature
gpg -o mydocgpg --sign mydoc
If, instead, you want to just generate a separate signature file, you use the --detachsig command This has the advantage of not having to generate a complete copy of the original file That file remains untouched The signature file usually has an extension such as sig In the following example, the user creates a signature file called mydoc2sig for the mydoc2 file
gpg -o mydoc2sig --detach-sig mydoc2
To verify the file using a detached signature, the recipient user specifies both the signature file and the original file
gpg --verify mydoc2sig mydoc2
To verify a trusted signature you can use gpgv You can 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 sign signature The following example creates a clear signed version of a text file called mynoticetxt
gpg -o mysignoticetxt --clearsign mynoticetxt
NOTE Numerous GUI front ends and filters are available for GnuPG at wwwgnupgorg GPA
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 manage your collection of public keys, the keys in your keyring file
16:
Encryption, Integrity Checks, and Signatures
TIP Steganography is a form of 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 linux01gwdgde/~alatham/stegohtml 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 A software package could be intercepted in transmission and some of its system-level files changed or substituted Software packages from your distribution, 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
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