隨著科技的進步，智慧卡的種類漸增，功能也愈趨完善，生活中需要使用到智慧卡的時機也愈來愈頻繁，與之相對的，其安全性也愈加受到重視，尤其在卡片遺失的情形下，必須做到卡片中留存的資料就算被有心人士竊取，也無法從中得出使用者密碼(password)，藉以偽冒成合法使用者，如此才能確保卡片使用者的安全。為了達到此一目的，許多學者在智慧卡的安全機制上做了許多的研究，如：2012年學者Cheng等人提出了一個基於智慧卡的遠端使用者登錄認證機制。同一時期，學者Li等人也提出了多伺服器網路中，基於密碼驗證的智慧卡認證機制。本研究中，我們發現Cheng等人及Li等人所自訂之智慧卡認證協議，在智慧卡遺失的情況下，並未提供完整的保密環境，導致其使用者與伺服器雙方所建立的秘鑰與會議金鑰可能被破解而無法得知。因此，我們提出了改良版的基於邏輯運算的智慧卡身分驗證機制，加入Diffie-Hellman密鑰交換，以達到更具安全性的目標。 / With advances in technology, different types and functions of smart cards have become more popular and perfect in recent years. We use smart cards in daily life more and more frequent, so smart card security has become a very important issue, especially in the case of smart-card-loss. We have to ensure that if our card is lost and someone steals the sensitive data in our card, he/she cannot use it to guess or get user’s password. To achieve the goal, many researchers have done a lot of work in smart card security. In 2012 Cheng et al. proposed a smart card based authentication scheme for remote user login and verification. During the same period, Li et al. proposed a password and smart card based user authentication mechanism for multi-server environments. In this thesis, we first pointed out the security flaws of Cheng et al.’s and Li et al.’s mechanism. We found that Cheng et al.’s and Li et al.’s mechanism cannot be secure under offline-dictionary attack in the smart-card-loss case. This enables adversaries to guess user’s password and session keys. Secondly, we introduced an improved version of smart card based authentication mechanism using Diffie-Hellman key exchange to overcome the above mentioned problems
| Identifer | oai:union.ndltd.org:CHENGCHI/G0100971019 |
| Creators | 張詠詠, Chang, Yung Yung |
| Publisher | 國立政治大學 |
| Source Sets | National Chengchi University Libraries |
| Language | 中文 |
| Detected Language | English |
| Type | text |
| Rights | Copyright © nccu library on behalf of the copyright holders |
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