VERIFICATION DEVICE, VERIFICATION PROGRAM, AND VERIFICATION METHOD

An acquisition unit (91) acquires reception data (103). A first extraction unit (92) extracts a domain name (108) which is a domain name for download, from the reception data (103). A second extraction unit (93) extracts owner information (107) which indicates an owner of a public key certificate included in the reception data (103). A search unit (16) searches a domain information search service(6) by using the owner information (107) as a search key, and acquires a management domain name (202) which is managed by the owner indicated by the owner information (107). A determination unit (18)determines whether a program included in the reception data (103) is legitimate by comparing the management domain name (202) with the domain name (108). 取得部(91)取得接收数据(103)。第1提取部(92)从接收数据(103)中提取下载域名即域名(108)。第2提取部(93)提取表示接收数据(103)中包含的公开密钥证书的所有者的所有者信息(107)。检索部(16)将所有者信息(107)作为检索关键字来检索域信息检索服务(6)，取得所有者信息(107)所示的所有者管理的管理域名(202)。判定部(18)通过管理域名(202)和域名(108)的核对，判定接收数据(103)中包含的程序是否非法。