Various examples are directed to systems and methods for secure messaging between computing components. A first computing device may send tree generation data to a second computing component. The tree generation data may comprise string selection data identifying a set of at least two strings of a string library. The first computing component may generate a coding tree based at least in part on the tree generation data and the string library and encode a first message based at least in part on the coding tree to generate a first encoded message. The first computing component may send the first encoded message to the second computing component.