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PGP can provide several services based on the requirements of the user An e-mail can use one or more of these services
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The simplest case is to send the e-mail message in plaintext (no service) Alice, the sender, composes a message and sends it to Bob, the receiver The message is stored in Bob's mailbox until it is retrieved by him
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Probably the next improvement is to let Alice sign the message Alice creates a digest of the message and signs it with her private key When Bob receives the message, he verifies the message by using Alice's public key Two keys are needed for this scenario Alice needs to know her private key; Bob needs to know Alice's public key
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A further improvement is to compress the message and digest to make the packet more compact This improvement has no security benefit, but it eases the traffic
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As we discussed before, confidentiality in an e-mail system can be achieved by using conventional encryption with a one-time session key Alice can create a session key, use the session key to encrypt the message and the digest, and send the key itself with the message However, to protect the session key, Alice encrypts it with Bob's public key
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SECURITY IN THE INTERNET: IPSec, SSUFLS, PGP, VPN, AND FIREWALLS
Code Conversion Another service provided by PGP is code conversion Most e-mail systems allow the message to consist of only ASCII characters To translate other characters not in the ASCII set, PGP uses Radix 64 conversion Each character to be sent (after encryption) is converted to Radix 64 code Segmentation PGP allows segmentation of the message after it has been converted to Radix 64 to make each transmitted unit the uniform size allowed by the underlying e-mail protocoL
A Scenario
Let us describe a scenario that combines some of these services, authentication and confidentiality The whole idea of PGP is based on the assumption that a group of people who need to exchange e-mail messages trust one another Everyone in the group somehow knows (with a degree of trust) the public key of any other person in the group Based on this single assumption, Figure 3220 shows a simple scenario in which an authenticated and encrypted message is sent from Alice to Bob
Figure 3220 A scenario in which an e-mail message is authenticated and encrypted
Alice's Bob's private public Bob's Alice's private public
Alice Bob
-PGPmessage
PGP header
PAl +
PAl: Public-key algorithm 1 (for encrypting session key) PA2: PubliC-key algorithm (for encrypting the digest) SA: Symmetric-key algorithm identification (for encrypting message and digest) HA: Hash algorithm identification (for creating digest)
Sender Site The following shows the steps used in this scenario at Alice's site: 1 Alice creates a session key (for symmetric encryption/decryption) and concatenates it with the identity of the algorithm which will use this key The result is encrypted
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with Bob's public key Alice adds the identification of the public-key algorithm used above to the encrypted result This part of the message contains three pieces of information: the session key, the symmetric encryption/decryption algorithm to be used later, and the asymmetric encryption/decryption algorithm that was used for this part
a Alice authenticates the message (e-mail) by using a public-key signature algorithm and encrypts it with her private key The result is called the signature Alice appends the identification of the public key (used for encryption) as well as the identification of the hash algorithm (used for authentication) to the signature This part of the message contains the signature and two extra pieces of information: the encryption algorithm and the hash algorithm b Alice concatenates the three pieces of information created above with the message (e-mail) and encrypts the whole thing, using the session key created in step 1 3 Alice combines the results of steps 1 and 2 and sends them to Bob (after adding tue appropriate PGP header)
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