Abstract
This software utilizes both public key and private key cryptographic schemes for encryption and signing of the e-mail content and the attachments. Elliptic Curve Cryptography (ECC) is selected for public key cryptography while chaotic cryptography is chosen for private key cryptography. The use of ECC reduces the key distribution loading as the public key can be broadcasted. The system parameters used in chaotic cryptography are the secret keys to be exchanged via ECC. Moreover, signing on the e-mail content and the attachments is performed by Elliptic Curve Digital Signature Algorithm (ECDSA). PC version as well as PDA version of this software have been developed.

Features
• Key length of ECC is much shorter than that of RSA
• An integration of ECC and chaotic cryptography
• Efficient implementation of ECDSA using fast algorithms

Contact Information
Mr H Y Wong
Director, Technology Transfer Office
City University of Hong Kong
83 Tat Chee Avenue
Kowloon, Hong Kong
Tel : (852) 2788 8428
Fax : (852) 2788 9119
Email : hy.wong@cityu.edu.hk

簡介
這套軟件利用公匙及私匙密碼學來加密及加簽電郵內容及附件，其中的公匙加密法採用了橢圓曲線加密法，而混沌加密法則會作為所需的私匙加密方法。因為公匙可以隨意公開，所以橢圓曲線加密法大大減低了分派私匙的工作量，它正好用來傳遞混沌加密法所需的秘密系統參數。在電郵的內容及附件上加簽所用的是橢圓曲線數碼簽名法。這套軟件備有適用於個人電腦及個人數碼助理的版本。

特色
• 橢圓曲線加密法所需的密碼長度比RSA所需的短得多
• 及混沌加密法結合起來
• 進行快捷的橢圓曲線數碼簽名法

查詢
香港城市大學技術轉移處處長黃漢儀先生
地址 : 香港九龍達之路83號
電話 : (852) 2788 8428
傳真 : (852) 2788 9119
電郵 : hy.wong@cityu.edu.hk