Abstract
In this work, we study message authentication code (MAC) schemes supporting variable tag lengths. We provide a formalisation of such a scheme. Several variants of the classical Wegman-Carter MAC scheme are considered. Most of these are shown to be insecure by pointing out detailed attacks. One of these schemes is highlighted and proved to be secure. We further build on this scheme to obtain single-key variable tag length MAC schemes utilising either a stream cipher or a short-output pseudo-random function. These schemes can be efficiently instantiated using practical well known primitives.
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