本博士論文旨在探討如何使用一些輕負擔的技術，以提供各種無線通訊的不同安全需求，以保障人類無所不在的通訊隱私的安全。
我們說明何謂「輕負擔」？何謂「無線通訊」？與何謂「安全」？並嚐試用正規方法去證明安全性。
我們避開使用會被量子電腦破解的密碼技術，與高計算複雜度的密碼技術。
我們嚐試追求「簡單即是美」的自然、藝術境界。

Wireless technology releases us from copper wires. A user can have a notebook computer, PDA, Pocket PC, Tablet PC, or just a cell phone and stay online anywhere a wireless signal is available. The basic theory behind wireless technology is that signals can be carried by electromagnetic waves that are then transmitted to a signal receiver. Because of the nature of transmission, the communication in the air via various wireless technologies is easier than the traditional wired communication environments. However, due to the broadcast nature of the wireless channel, wireless communication suffers more security threats than the wired one. In this regard, the attacker may intercept the transmitted message by eavesdropping the wireless channel even the encrypted wireless communication provided. Moreover, since the communication in every session may be associated with the fixed identity and the static security credentials of the same individual. Therefore, the attackers may track any individual with wireless devices such as mobile phone, RFID tag, bio-sensor, etc. by intercepting its wireless communication. In addition to that, mobility of the wireless devices such as mobile phones, RFID tags incurs possible threat to the past encrypted transmitted data, where the past session keys for the encryption of wireless communications may be derived by the long-term secret key of the wireless devices if it was lost or broken. On the other hand, security (privacy and integrity) of the transmitted data is another imperative concern in wireless communication, where an attacker may intercept and try to alter the transmitted data communicated between the wireless devices and that eventually can bring about various security issues. By providing the features of anonymity, untraceability, perfect forward secrecy in the authentication protocols and with the help of an efficient data security mechanism, the aforesaid security threats can be dealt in wireless communication.
Although, impressive efforts have been made for accomplishing the security feature such as, anonymity, however, this thesis shows that existing approaches to ensure the property like anonymity are impractical. Besides, even though, some public key crypto-systems such as Differ-Hellman can provide the solution of perfect forward secrecy. However, most of the existing standards of wireless communication, e.g. global system for mobile communications (GSM), universal mobile telecommunications systems (UMTS), WiFi protected access, and etc., are based on symmetric-key crypto-system, where an asymmetric operation such modular exponential operation causes significantly higher communication overhead and execution time than the symmetric key operations, which is greatly imperative for any battery powered wireless devices such as mobile devices, RFID tags, sensors etc.
In this thesis, at first we show some ways to design the lightweight anonymous authentication framework, which can efficiently accomplish the features like anonymity, untraceability, perfect forward secrecy, etc. In this regard, we use the lightweight cryptographic primitives such as symmetric key encryption/decryption, one-way non-collision hash functions and Exclusive-OR operations, which are more suitable for battery powered wireless devices. In addition to that, this thesis also focuses on the data security, i.e. privacy, and integrity of the transmitted data communicated between the wireless devices. In this context, we design some data security frameworks in the form of single-pass authenticated encryption modes (Authencryption) by using the encryption modes such as counter mode, cipher feedback mode, etc., where these conventional modes cannot ensure privacy and integrity of the transmitted data in a single pass. Subsequently, we enforce our designed lightweight anonymous authentication frameworks and data security frameworks for ensuring security in various wireless networks, such as mobile network, wireless sensor network, etc. Furthermore, security analyses show that our proposed solutions are secure and hence can be useful for wireless communication.

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