Certification authority (short for CA) is the nature person or legal man that signs the digital certification and provides services related to the digital signature. In the development of the electronic business, CA plays an important role in supporting and encouraging in the commercial business in the internet. Because there in no direct contract ralationshiop between CA and the relying third party, so when the relying third party suffer a lost because of trusting the certificate of which the information is incorrect ,it often cause arguments on the characeristic and the assuming of the liabilities.This thesis includes four parts. The first part makes an introduce of each party of legal privity. The second part discusses what kind of the liability it is by comparing three different theory. The third part discusses what libility CA has to assume under different condictions, and under what kind of situation could CA limit or even exempt from its liability. The last part of the thesis is to give some advise on our countries' electronic commerce legislation about CA's liability.
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