| This study aimed to determine if the customer C2C (Customer To Customer) e-oommerce in Indonesia see the website interface quality, information quality, privacy and security risks as a key factor affecting the satisfaction and confidence and to find out whether customers C2C (Customer To Customer) e-commerce in Indonesia saw customer satisfaction and customer trust as a key factor that affects customer loyalty. The research will be done on internet users in Indonesia in KASKUS web sites that have made the purchase of goods / services via e-commerce. Pengumpulan data in the field survey carried out by using a questionnaire. Questionnaire sent to several mailing lists (discussion groups on the Internet). The spread of this questionnaire to collect data through a service writer distribute online survey sites on the address link www.kwiksurveys.com obtained and how the spread of this online survey authors spread through how to give link to some social media services. In this study, the sample size adjusted to the analytical model used is Structural Equation 40 Model (SEM). In this regard, the sample size for SEM using maximum likelihood estimation model estimation (MLE) is 300 samples. SEM analysis performed using the software Linear Structural Relationships (LISREL) version 8.7. Research has been done shows mat the presence of a significant effect between the quality of information, increased security (PSR), security, privacy (PP) of consumer confidence (ECS), as well as increased security (PSR), Security privacy (PP) as well as customer satisfaction very important influence on customer loyalty (ECL), and also prove the hypothesis that customer trust (ECT) is supporting its customers to become loyal customers of an e-commerce site (ECL), for User Interface Quality (UIQ) does not have enough influence significant impact on customer satisfaction (ECS) and the trust of customers (ECT), as well as the Interface Quality (IQ) did not significantly affect customer satisfaction (ECS). |