barcode generator macro excel U D One security protocol for the e-mail system is Pretty Good Privacy (PGP) PGP in Software

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U D One security protocol for the e-mail system is Pretty Good Privacy (PGP) PGP
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SECURITY IN THE INTERNET: IPSec, SSUFLS, PGP, VPN, AND FIREWALLS
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To exchange e-mail messages, a user needs a ring of public keys; one public key is needed for each e-mail correspondent POP has also specified a ring of private/public key pairs to allow a user to change her pair of keys from time to time POP also allows each user to have different user IDs (e-mail addresses) for different groups of people POP certification is different from X509 In X509, there is a single path from the fully trusted authority to any certificate In POP, there can be multiple paths from fully or partially trusted authorities pap uses the idea of certificate trust levels When a user receives a certificate from an introducer, it stores the certificate under the name of the subject (certified entity) It assigns a level of trust to this certificate
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1 Why does IPSec need a security association
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3 What are the two protocols defined by IPSec 4 What does AH add to the IP packet
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5 What does ESP add to the IP packet 6 Are both AH and ESP needed for IP security Why or why not 7 What are the two protocols discussed in this chapter that provide security at the transport layer 8 What is IKE 9 What is the difference between a session and a connection in SSL 10 How does SSL create a set of security parameters 11 What is the name of the protocol, discussed in this chapter, that provides security for e-mail 12 How does PGP create a set of security parameters 13 What is the purpose of the Handshake Protocol in SSL 14 What is the purpose of the Record Protocol in SSL 15 What is the purpose of a firewall 16 What are the two types of firewalls 17 What is a VPN and why is it needed 18 How do LANs on a fully private internet communicate
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Exercises
19 Show the values of the AH fields in Figure 326 Assume there are 128 bits of authentication data 20 Show the values of the ESP header and trailer fields in Figure 327
SECTION 328
PRACTICE SET
21 22 23 24 25 26 27 28 29 30 31 32
Redraw Figure 326 if AH is used in tunnel mode Redraw Figure 327 if ESP is used in tunnel mode Draw a figure to show the position of AH in IPv6 Draw a figure to show the position of ESP in IPv6 Does the IPSec Protocol need the services of a KDC Explain your answer Does the IPSec Protocol need the services of a CA Explain your answer Does the SSL Protocol need the services of a KDC Explain your answer Does the SSL Protocol need the services of a CA Explain your answer Does the PGP Protocol need the services of a KDC Explain your answer Does the pap Protocol need the services of a CA Explain your answer Are there any cipher suites in IPSec Explain your answer Are there any cipher suites in PGP Explain your answer
APPENDIX A
Unicode
Computers use numbers They store characters by assigning a number for each one The original coding system was called ASCII (American Standard Code for Information Interchange) and had 128 numbers (0 to 127) each stored as a 7-bit number ASCII could satisfactorily handle lowercase and uppercase letters, digits, punctuation characters, and some control characters An attempt was made to extend the ASCII character set to 8 bits The new code, which was called Extended ASCII, was never internationally standardized To overcome the difficulties inherent in ASCII and Extended ASCII, the Unicode Consortium (a group of multilingual software manufacturers) created a universal encoding system to provide a comprehensive character set called Unicode Unicode was originally a 2-byte character set Unicode version 3, however, is a 4-byte code and is fully compatible with ASCII and Extended ASCII The ASCII set, which is now called Basic Latin, is Unicode with the upper 25 bits set to zero Extended ASCII, which is now called Latin-I, is Unicode with the 24 upper bits set to zero Figure AI shows how the different systems are compatible
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