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30 Add a symmetric-key encryption/decryption layer to Figure 3111 to provide privacy 31 Add an asymmetric-key encryption/decryption layer to Figure 3111 to provide privacy
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32 There is a hashing algorithm called MD5 Find the difference between this algorithm and SHA-l 33 There is a hashing algorithm called RIPEMD-160 Find the difference between this algorithm and SHA-l 34 Compare MD5 SHA-1, and RIPEMD-160 35 Find some infonnation about RSA digital signature 36 Find some information about DSS digital signature
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In this chapter, we want to show how certain security aspects, particularly privacy and message authentication, can be applied to the network, transport, and application layers of the Internet model We briefly show how the IPSec protocol can add authentication and confidentiality to the IP protocol, how SSL (or TLS) can do the same for the TCP protocol, and how PGP can do it for the SMTP protocol (e-mail) In all these protocols, there are some common issues that we need to consider First, we need to create a MAC Then we need to enCl)'pt the message and, probably, the MAC This means, that with some minor variations, the three protocols discussed in this chapter take a packet from the appropriate layer and create a new packet which is authenticated and encrypted Figure 321 shows this general idea
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Figure 321 Common structure of three security protocols
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Header of security protocol Payload (from IP, TCP, or SMTP)
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Note that the header or the trailer of the security protocol mayor may not be included in the encryption process Note also that some protocols may need more information in the secured packet; the figure shows only the general idea One common issue in all these protocols is security parameters Even the simplified structure in Figure 321 suggests that Alice and Bob need to know several pieces of information, security parameters, before they can send secured data to each other In particular, they need to know which algorithms to use for authentication and encryption/decryption
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SECURITY IN THE INTERNET: IPSec, SSl/TLS, PGP, VPN, AND FIREWALLS
Even if these algorithms can be predetermined for everyone in the world, which they are not as we will see, Bob and Alice still need at least two keys: one for the MAC and one for encryption/decryption In other words, the complexity of these protocols lies not in the way the MAC data are calculated or the way encryption is performed; it lies in the fact that before calculating the MAC and performing encryption, we need to create a set of security parameters between Alice and Bob At first glance, it looks as if the use of any of these protocols must involve an infinite number of steps To send secured data, we need a set of security parameters The secure exchange of security parameters needs a second set of security parameters The secure exchange of the second set of security parameters needs a third set of security parameters And so on ad infinitum To limit the steps, we can use public-key cryptography if each person has a private and public key pair The number of steps can be reduced to one or two In the one-step version, we can use session keys to create the MAC and encrypt both data and MAC The session keys and the list of algorithms can be sent with the packet but encrypted by using public-key ciphers In the two-step version, we first establish the security parameters by using public-key ciphers We then use the security parameters to securely send actual data One of the three protocols, PGP, uses the first approach; the other two protocols, IPSec and SSLITLS, use the second We also discuss a common protocol, the virtual private network (VPN), that uses the IPSec At the end of the chapter, we discuss the firewall, a mechanism for preventing the attack on the network of the organization
IPSecurity (IPSec)
IPSecurity (IPSec) is a collection of protocols designed by the Internet Engineering Task Force (IETF) to provide security for a packet at the network level IPSec helps to create authenticated and confidential packets for the IP layer as shown in Figure 322 Figure 322 TCPIIP protocol suite and IPSec
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