RCrypto : Rcrypto is our resilient key server system (RCRypto) that is able to protect private keys of a public key crypto based security system even if some components of the system are compromised. Read more...

Secure Scalable JPEG2000 codestreams : As a flexible authentication method and a scalable access control method for JPEG2000 image code-streams, it possesses the properties:“sign once, verify many ways” and “encrypt once, access many ways”.

TrustQuery : TrustQuery enables users to verify that their query results are complete (i.e., no qualifying tuples are omitted) and authentic (i.e., all the result values originated from the owner). It supports range selection on key and non-key attributes, project as well as join queries on relational databases.

Privacy Protection for Transactions of Digital Goods : Privacy has been a sensitive issue long before the advent of the Internet. The Internet, however, creates many new threats to personal privacy and raises some unique privacy concerns. Over the past several years, a number of web sites have been caught in high-profile blow-ups over how they collect and use users data. Read more...

Non-Repudiation for Mobile Environments : Human identity plays an integral part in our daily lives. It takes the form of physical attributes (facial appearances, fingerprints, etc), hand written signatures and more recently, electronic means such as passwords, smart cards and digital signatures. The digital revolution along with the proliferation of mobile devices will change the way we perceive identity and associate commitments (legal or otherwise) to people. Read more...

Analysis of Cryptographic Systems : Cryptography is the science of secure communications and data integrity protection while the analysis of cryptographic systems, or cryptanalysis, is the dual science of attacking or even breaking into such systems. Since 1996, researchers in our department have successfully attacked more than 60 cryptographic systems and security protocols. Read more...

Digital Content Protection : Content protection is one of the key issues for e-commerce of digital products. A market without content protection will not last long since illegal copies will hurt everyone in the end, including consumers. Our copyright protection system utilises strong encryption technology and fulfils the requirements to distribute documents to clients in a controlled manner. Read more...

UbiCash - A Micropayment System : Currently, the most common approach for online payment is using credit cards. According to Gartner Interactive, fraud is 12 times more online than offline; and according to Meridian Research, online fraud could reach $60 billion by 2005. Tools for credit card frauds are just a click away - free software for generating perfect valid credit card numbers are available on the web. Read more...

Fair Exchange of Valuable Data over Internet : As more business is conducted over the Internet, the fair exchange problem assumes increasing importance. For instance, suppose you are willing to pay a travel agent electronic cash in exchange for an electronic airline ticket. The challenge here is how can you and the travel agent exchange these items so that either each of you get the other's item, or neither of you get anything useful. Read more...

Residential Gateway (2000-2001) : Designed and implemented a residential gateway system based on embedded Linux and VPN in a joint project with National Semiconductor Corporation.

Public Key Infrastructure (1998-99) : Developed a Java based PKI system which was licensed to Computer Associates International.

Fair Exchange System (1998-99) : Our research result in fair exchange was implemented into an Internet based fair exchange system and was licensed to Computer Associates International.

Virtual Private Network (1996-97) : Designed and implemented a suite of virtual private network (VPN) solutions in 1996. The system was successfully tested over Singapore's broadband network S-One and was licensed to CET Pte Ltd, Internet Appliance Pte Lte, and Computer Associates International.

Internet CashCard (1997) : Designed and developed the world's first operational electronic cash system over the Internet code named C-One. The system was launched by Prime Minister Goh and has been in operation since January 1998.

Certificate Authority (1996) : Designed and developed a public key certification authority system which was licensed to Port of Singapore Authority and Development Bank of Singapore.