Network Coding and Wireless Physical-layer ... - Jacobs University

More documents

Recommendations

Info

Chapter 6 Wireless Physical-layer Secret-key Generation (WPSG) in Relay Networks: Information Theoretic Limits, Key Extension, and Security Protocol A physical-layer security scheme based on mutual channel-state information (CSI) [8], [71] is discussed in this chapter. Before describing the recent development in our own research, we find ourselves obliged to begin with the basic components of cryptosystems in general. Section 6.1 discusses some general ideas and concepts in cryptology and introduces the cryptosystem model of wireless physical-layer secret-key generation (WPSG). Section 6.2 gives some information-theoretic limits relevant to the key generation process in the case of direct communication without relays as well as some simulation results. This includes the consideration regarding the possibility that the enemy cryptanalyst can estimate some parts of the key. After that, Section 6.3 extends our analysis regarding the amount of generated key further to the cases in which relay nodes are located between transmitter 77
Chapter 6: Wireless Physical-layer Secret-key Generation (WPSG) in Relay Networks: 78 Information Theoretic Limits, Key Extension, and Security Protocol and receiver. Then, Section 6.4 investigates the rate of key generation. Empirical results from [33, 34] show that, for direct communication, the ratio of the number of vulnerable key bits to the total number of generated key bits is low when there are many wireless transmission paths and the eavesdropper is not within the distance of one wavelength from the transmitter or the receiver. However, as described in Section 6.5, this ratio increases in relay communication. To keep the number of vulnerable key bits as low as possible, some security protocols for relay communication are given in that section. 6.1 Cryptosystem of Wireless Physical-layer Secretkey Generation (WPSG) Massey [31] suggests a model of a secret-key cryptosystem as shown in Fig. 6.1. Its concept of security is based on Shannon’s idea of perfect secrecy, which means that, for a plain text X and its cryptogram Y, P (X = x|Y = y) = P (X = x) for all possible plain texts x = [x 1 , x 2 , ..., x M ] and cryptograms y. In this case, neither the knowledge of the cryptogram y nor large computational power can help an enemy cryptanalyst to decrypt the message x, unless he or she knows the secret key. Message Source X Encryptor Y Decryptor X Destination Randomizer R Enemy Cryptanalyst Secure Channel Z Key Source Xe Ze Z Figure 6.1: A secret-key cryptosystem In Massey’s generalized model, the encryptor mixes the plain text X with the random message R and the secret key Z to achieve perfect secrecy. However, some systems, such as the “one-time pad,” which will be discussed in the next chapter, do not require R. In such cryptosystems, the major implementation difficulty lies in the secure distribution of
Page 1:
Network Coding and Wireless Physica
Page 4 and 5:
Abstract The general abstraction of
Page 6 and 7:
Contents Abstract i Abstract ii Dec
Page 8 and 9:
vi CONTENTS 5.4 Degree Distribution
Page 10 and 11:
List of Figures 2.1 A basic digital
Page 12 and 13:
x LIST OF FIGURES 5.11 Comparison o
Page 14 and 15:
Part I Motivation, Overview, and In
Page 16 and 17:
Chapter 1: Motivation and Overview
Page 18 and 19:
Chapter 2 Introduction to Digital C
Page 20 and 21:
Chapter 2: Introduction to Digital
Page 22 and 23:
Page 24 and 25:
Page 26 and 27:
Page 28 and 29:
Page 30 and 31:
Chapter 3: Introduction to Graphs a
Page 32 and 33:
Page 34 and 35:
Page 36 and 37:
Page 38 and 39:
Page 40 and 41: Chapter 3: Introduction to Graphs a
Page 46 and 47: 33 The emergence of scalable video
Page 48 and 49: Chapter 4: Unequal Erasure Protecti
Page 72 and 73: Chapter 5: Network Coding with LT C
Page 88 and 89: Part III Wireless Physical-layer Se
Page 92 and 93: Chapter 6: Wireless Physical-layer
Page 104 and 105: Chapter 7 Physical-layer Key Encodi
Page 106 and 107: Chapter 7: Physical-layer Key Encod
Page 124 and 125: Chapter 8: Summary, Conclusion, and
Page 132 and 133: Bibliography [1] 3GPP, “3GPP; Tec
Page 134 and 135: BIBLIOGRAPHY 121 [21] F.A. Hayek,
Page 136 and 137: BIBLIOGRAPHY 123 [43] M. Friedman a
Page 138 and 139: BIBLIOGRAPHY 125 [63] S. Jaggi, P.
Page 140:
BIBLIOGRAPHY 127 [81] X. Sun, X. Wu
show all

Network Coding and Wireless Physical-layer ... - Jacobs University

Create successful ePaper yourself

Delete template?

Save as template?