TCP/IP Protocol Suite 1 Chapter 28 Upon completion you will be able to: Security Differentiate between two categories of cryptography schemes Understand.

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Presentation transcript:

TCP/IP Protocol Suite 1 Chapter 28 Upon completion you will be able to: Security Differentiate between two categories of cryptography schemes Understand four aspects of security Know how and where IPSec, TLS, and PGP provide security Firewall Objectives

TCP/IP Protocol Suite CRYPTOGRAPHY The word cryptography in Greek means “secret writing.” The term today refers to the science and art of transforming messages to make them secure and immune to attacks. The topics discussed in this section include: Symmetric-Key Cryptography Asymmetric-Key Cryptography Comparison

TCP/IP Protocol Suite 3 Figure 28.1 Cryptography components

TCP/IP Protocol Suite 4 In cryptography, the encryption/decryption algorithms are public; the keys are secret. Note:

TCP/IP Protocol Suite 5 In symmetric-key cryptography, the same key is used by the sender (for encryption) and the receiver (for decryption). The key is shared. Note:

TCP/IP Protocol Suite 6 Figure 28.2 Symmetric-key cryptography

TCP/IP Protocol Suite 7 In symmetric-key cryptography, the same key is used in both directions. Note:

TCP/IP Protocol Suite 8 Figure 28.3 Caesar cipher

TCP/IP Protocol Suite 9 Figure 28.4 Transpositional cipher

TCP/IP Protocol Suite 10 Figure 28.5 Data Encryption Standard (DES)

TCP/IP Protocol Suite 11 Figure 28.6 Iteration block

TCP/IP Protocol Suite 12 Figure 28.7 Triple DES

TCP/IP Protocol Suite 13 The DES cipher uses the same concept as the Caesar cipher, but the encryption/ decryption algorithm is much more complex. Note:

TCP/IP Protocol Suite 14 Figure 28.8 Public-key cryptography

TCP/IP Protocol Suite 15 Figure 28.9 RSA

TCP/IP Protocol Suite 16 Symmetric-key cryptography is often used for long messages. Note:

TCP/IP Protocol Suite 17 Asymmetric-key algorithms are more efficient for short messages. Note:

TCP/IP Protocol Suite SECURITY IN THE INTERNET IP Level Security: IPSec Transport Layer Security Application Layer Security: PGP

TCP/IP Protocol Suite 19 Figure Transport mode

TCP/IP Protocol Suite 20 Figure Tunnel mode

TCP/IP Protocol Suite 21 Figure Authentication Header (AH)

TCP/IP Protocol Suite 22 The AH protocol provides message authentication and integrity, but not privacy. Note:

TCP/IP Protocol Suite 23 Figure Encapsulating Security Payload (ESP)

TCP/IP Protocol Suite 24 ESP provides message authentication, integrity, and privacy. Note:

TCP/IP Protocol Suite 25 Figure Position of TLS

TCP/IP Protocol Suite 26 Figure PGP at the sender site

TCP/IP Protocol Suite 27 Figure PGP at the receiver site

TCP/IP Protocol Suite FIREWALLS A firewall is a device (usually a router or a computer) installed between the internal network of an organization and the rest of the Internet. It is designed to forward some packets and filter (not forward) others. A firewall is a device (usually a router or a computer) installed between the internal network of an organization and the rest of the Internet. It is designed to forward some packets and filter (not forward) others. The topics discussed in this section include: Packet-Filter Firewall Proxy Firewall

TCP/IP Protocol Suite 29 Figure Firewall

TCP/IP Protocol Suite 30 Figure Packet-filter firewall

TCP/IP Protocol Suite 31 A packet-filter firewall filters at the network or transport layer. Note:

TCP/IP Protocol Suite 32 Figure Proxy firewall

TCP/IP Protocol Suite 33 A proxy firewall filters at the application layer. Note: