This talk focuses on the privacy challenges that arise after genetic testing, delving into the security concerns and potential risks associated with genomic data. As genetic testing technology becomes increasingly accessible, more consumers are opting for commercial genetic testing services to gain insights into their health risks and personal genetic traits. However, many overlook the fact that genetic data from these tests can be a high-risk source of privacy breaches. This presentation will examine the characteristics of genomic data, explaining how high linkage disequilibrium can be exploited to infer additional sensitive personal information, thereby posing a threat not only to individuals but also to their family members' privacy.