Group-Oriented Digital Signature and envelop with Java Card Implementation
Date Issued
2004
Date
2004
Author(s)
Chang, Chin-Wen
DOI
en-US
Abstract
As technology grows, digital signature and envelop have become more and more important in electronic commerce world. It becomes common that a group owns a secret key/public key to represent the group. A group-oriented threshold scheme provides a secure and convenient way for signing a group signature or decrypting a cipher text. Any outsider can send an encrypted message to this group, the cipher text can be deciphered as long as the participating member number is larger than or equal to the threshold number. And the group signature can be generated as long as the participating member number is larger than or equal to the threshold number. Any outsider can verify the signature. In this paper, we adapted a threshold scheme without Key Authentication Center, signature and decryption are mutually generated without any trust agent involved. We then designed a whole group-oriented threshold signature and envelop system with Java card implementation. Java cards provide not only security and portability for secret keys but also powerful on-card computation capability. This enables us to keep secret value computations on card therefore secret keys are never revealed in plaintext outside Java cards. From performance of our system, we discussed the limitation of today’s Java card.
Subjects
電子信封
解密
電子簽章
JAVA卡
門檻理論
群體導向
decryption
Java card
Group-oriented
digital envelop
digital signature
threshold scheme
Type
thesis
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