Relationship by nature or character; affinity. 亲密关系由性质或特征形成的关系;密切关系。
It describes the relationship between files by file lineage, and measures the connection between users by affinity degree of roles, and divides the confidentiality of files by security degree. 提出用文件血统来表示文件之间的安全关联关系,用角色亲和度来衡量角色(用户)间的亲疏关系,用安全级划分文件重要程度。