NUMBER OF PAGES: 56

This report documents the attempt to raise security for clients against a threat model, with these three at-tacks; Man In The Middle (MITM), phishing, and tampering attacks. The analysis describes security mechanisms and existing technology to prevent the three attacks in the threat model. It was discovered in the analysis that there exists tech-nology to prevent MITM and phish-ing attacks, but no security mecha-nism exist to prevent tampering of Java client programs. Instead of designing and implement-ing existing technology as secu-rity mechanisms to prevent MITM and phishing attacks, the project should be, to design and imple-ment a possible tamper-proofing se-curity mechanism for Java client programs. In the design and imple-mentation chapters, documentation of the prototype tamper-proofing se-curity mechanism is found. The test shows that the security mechanism is not sufficient, to en-sure that the client was actual tamper-proof. However, when the prototype was tested, a nice prop-erty was found in the embedding of an illegal byte array operation, which could make it possible to al-low one to trust the client for a small period of time