💡 Researches

:speaking_head: Overview # To detect the theft of Java class files efficiently, we propose a concept of Java birthmarks, which are unique and native characteristics of every class file. For a pair of class files $p$ and $q$, if $q$ has the same birthmark as $p$’s, $q$ is suspected as a copy of $p$. Ideally, the birthmarks should satisfy the following properties: (a) preservation – the birthmarks should be preserved even if the original class file is tampered with, and (b) distinction – independent class files must be distinguished by completely different birthmarks. Taking (a) and (b) into account, we propose four types of birthmarks for Java class files.