A method and system for securing data transmitted between a client device and a server by obtaining input text at an intermediate module, processing the input text to obtain processed text, and transmitting the processed text to the server. Embodiments of the invention include securing data between a client device and a server by processing the input text at the intermediate module by applying an order-preserving transformation, the order-preserving transformation comprising: generating order information based on the input text, the order information indicative of a relative order of the input text within a set of possible input texts according to a collation rule.