臺灣博碩士論文加值系統

現今的ATM(Asynchronous Transfer Mode )網路已廣泛應用於通信網路，擁有高速傳輸的特性，使的ATM逐漸應用在現階段的網路架構中，其中包括了商業交易、軍事通訊、多媒體應用等等，然而，隨著ATM網路提供的高速傳輸，在網路上傳輸的資料也大量增加，愈來愈多具有隱密性的資料也隨之在網路間傳送。因此，需要更強大且堅固的安全機制來保護傳送的資料，以避免資料外洩、被修改、盜取等等，ATM網路上的安全課題也就不容忽視，隨著ATM網路逐漸的發展，安全的機制也需要日益增強。本論文將探討在計數傳輸模式中，對於因為追求高速傳輸而喪失的加解密不同步，如何尋找一個適當的同步更新率，進而減少因細胞遺失或錯誤所造成的連續錯誤，並提出一個相對的同步化細胞送出率，由細胞遺失率與封包大小尋找適當的傳送點，提高傳輸細胞的正確率，減少重送情況的發生，提升網路效質。

Asynchronous Transfer Mode (ATM) network had been broadly used in communication network, as well as business trading, military communication and media application, etc. However, the higher the speed supported by ATM, the more personal private data conveyed through the whole network. Therefore, the robust security policy is required to protect the transmitted information, and to avoid the data from being disclosed, modified and purloined. The security problems should never be neglected. As the development of the ATM, the security policy is needed to further develop. The encryption mode of transmitting data used in ATM studied is the counter mode. This paper focused on finding an optimal re-synchronous rate. The new proposed re-synchronous rate is efficient in decreasing a serious of packet corrupted by an adjustable SKC interval and the overhead of SKC cells, in order to decelerate packet-resending and improve the quality of service.

Index
Chapter 1 Introduction 1
1.1 Introduction 1
1.2 Overview 2
Chapter 2 Previous Work 3
2.1 ATM Interface and Model 3
2.1.1 ATM Interface 3
2.1.2 ATM Layer Model 3
Chapter 3 ATM Security 12
3.1 User Plane Security 12
3.2 Control Plane Service 13
3.3 Security Agents Structure 13
3.4 ATM Security Protocol 16
Chapter 4 ATM Key Exchange Protocol 18
4.1 Encryption/Decryption Key 18
4.2 ATM Key Update 19
4.2.1 Session Key Exchange (SKE) 19
4.2.2 Session Key Changeover (SKC) 22
4.3 ATM Encryption Mode 23
4.3.1 Electronic Code Book(ECB) 24
4.3.2 Cipher Block Chaining mode(CBC) 25
4.3.3 Cipher FeedBack mode(CFB) 26
4.3.4 Output FeedBack mode (OFB) 28
4.3.5 Counter mode(CTR) 30
4.3.6 The comparison of those five encryption modes 31
Chapter 5 The Synchronous problem 33
5.1 State Vector (SV) 33
5.2 Cryptographic Procedures 36
5.2.1 AAL3/4 36
5.2.2 AAL5 38
5.3 Cryptographic error by cell loss and cell error 39
5.3.1 Cell Error 39
5.3.2 Cell Loss Insensitivity 40
5.3.2.1 AAL3/4 Connection 41
5.3.2.2 AAL5 Connection 41
5.3.3 Resynchronism Problem in AAL5 42
Chapter 6 Adjustable SKC Interval 46
6.1 Optimal SKC Interval 46
6.2 Simulation 48
Chapter7 Conclusion 54
Reference 55

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