Radio Frequency Identification Technology became more and more involved in authentication processes over the years and is still rising. Security in this context needs to be strongly ensured, hence security models have a crucial role motivated by the fact that any entity with the right tools can interfere or eavesdrop in the communication process between a tag and a reader. The two most relevant, complete and worth mentioning models at this hour are Serge Vaudenay’s model based on the introduced ‘blinder’ notion and the HPVP model of J. Hermans, R. Peeters and B. Preenel’s based on the left-or-right indistinguishability notion. We provide a comparison between these two models that highlights not only the differences and the similarities, but also the elements that make each model unique along with the tag corruption aspects and the different privacy levels achieved by each model regarding both symmetric and asymmetric cryptography.