This paper describes new two obfuscation methods the fist method can control computational complexity and the second method can achieve semantic obfuscation. The computational complexity can be strictly controlled by using the technique of RSA encryption. The computational complexity can be arbitrarily specified by the impossibility of factorization of prime number in RSA encryption method. Sem...

We consider general program obfuscation mechanisms using “somewhat trusted” hardware devices, with the goal of minimizing the usage of the hardware, its complexity, and the required trust. Specifically, our solution has the following properties: (i) The obfuscation remains secure even if all the hardware devices in use are leaky. That is, the adversary can obtain the result of evaluating any fu...

Embedding a personal identifier as a watermark to Java classfile is effective in order to protect copyrights of them. Monden et al.[1] proposed watermarking scheme that embeds arbitrary character sequence to the target method in a Java classfiles. But the scheme can be only used to embed the same watermark to each user’s classfiles. Therefore, if we apply this scheme for embedding each user’s p...

While code obfuscation attempts to hide certain characteristics of a program independently of an application, white-box cryptography (WBC) specifically focuses on software implementations of cryptographic primitives in an application. The aim of WBC is to resist attacks from an adversary having access to some ‘executable’ code with an embedded secret key. WBC, if possible, would have several ap...

An obfuscation is a behaviour-preserving program transformation whose aim is to make a program “harder to understand”. Obfuscations are mainly applied to make reverse engineering of object-oriented programs more difficult. In this paper, we propose a fresh approach by obfuscating abstract data-types allowing us to develop structuredependent obfuscations that would otherwise (traditionally) not ...