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GNU Privacy Guard: Encryption and Authentication
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To protect messages that you send by e-mail, Red Hat provides GNU Privacy Guard (GnuPG) encryption and authentication. GnuPG is GNU open source software that works much like Pretty Good Privacy (pgp) encryption. With GnuPG, you can both encrypt your messages and digitally sign them-protecting the message and authenticating that it is from you. Currently, KMail and exmh both support GnuPG encryption and authentication. On KMail, you can select the encryption to use on the Security panel in the Options window. Table 6-1: Security Applications Description Encryption and digital signatures ( 6) Intrusion detection ( 6)
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Applications GNU Privacy Guard (GPG) Tripwire
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Table 6-1: Security Applications Description Firewall packet filtering ( 40) Web proxy server ( 27) Secure Shell encryption and authentication for remote access ( 40) User authentication for access to services ( 40)
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Pluggable Authorization Modules (PAM) Authentication management and configuration ( 30) Shadow passwords Lightweight Directory Access Protocol (LDAP) Password encryption ( 30) User management and authorization ( 30)
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GnuPG makes use of public-key cryptography to encrypt data. Public-key encryption uses two keys to encrypt and decrypt a message, a private key and a public key. The private key you always keep and use to decrypt messages you have received. The public key you make available to those you send messages to. They then use your public key to encrypt any message they want to send to you. The private key decrypts messages, and the public key encrypts them. Each user has private and public keys. Reciprocally, if you want to send messages to another user, you would first obtain the user's public key and use it to encrypt the message you want to send to the user. The user then decrypts the messages with his or her own private key. In other words, your public key is used by others to encrypt the messages you receive, and you use other user's public keys to send messages to them. Each user on your Red Hat system can have their own public and private keys. They will use the gpg program to generate them and keep their private key in their own directory. A digital signature is used to both authenticate a message and provide a integrity check. Authentication guarantees that the message has not been modified-that it is the original message sent by you-and the integrity check verifies that it has not been changed. Though usually combined with encrypted messages to provide a greater level of security, digital signatures can also be used for messages that can be sent in the clear. For example, you would want to know if a public notice of upgrades of a Red Hat release was actually sent by Red Hat, and not by someone trying to spread confusion. Such a message still needs to be authenticated, checked to see if it was actually sent by the sender or, if sent by the original sender, was not somehow changed en route. Verification like this protects against modification or substitution of the message by someone pretending to be the sender. Digitally signing a message involves generating a checksum value from the contents of the message using an encryption algorithm such as the MD5 modification digest algorithm. This is a unique value that accurately represents the size and contents of your message. Any changes to the message of any kind would generate a different value. Such a value provides a way to check the integrity of the data. The MD5 value is then itself encrypted with your private key. When the user receives your message, they decrypt your digital signature with your public key. The user then generates an MD5 value of the message received and
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compares it with the MD5 value you sent. If they are the same, the message is authenticated-it is the original message sent by you, not a false one sent by a user pretending to be you. The user can use GnuPG to decrypt and check digital signatures. Normally, digital signatures are combined with encryption to provide a more secure level of transmission. The message would be encrypted with the recipient's public key, and the digital signature encrypted with your private key. The user would decrypt both the message (with their own private key) and then the signature (with your public key). They would then compare the signature with one the user generates from the message to authenticate it. When GnuPG decodes a message, it will also decode and check a digital signature automatically. Figure 6-1 shows the process for encrypting and digitally signing a message.
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Figure 6-1: Public-key encryption and digital signatures GPG operations are carried out with the gpg command, which uses both commands and option to perform tasks. Commonly used commands and options are listed in Table 6-2. Some commands and options have a short form that use only one dash. Normally two are used.
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