Applications of digital signature technology are on the rise because of legal and technological developments, along with strong market demand for secured transactions on the Internet. In order to predict the future demand for digital signature products and online security, it is important to understand the application development trends in digital signature technology. This comparative study across various modes of e-business indicates that the majority of digital signature applications have been developed for the Business-to-Business (B2B) mode of e-business. This study also indicates a slow adoption rate of digital signature products by governments and the potential for their rapid growth in the Business-to-Consumer (B2C) mode of e-business. These developments promise to provide a robust security infrastructure for online businesses, which may promote e-business further in the future.