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Message Authentication, Revisited

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Figure

Figure 1:TAG andVRFY with key (k, h), message m and randomness b.
Table 1: Overview of MAC constructions over prime-order groups. In all protocols, TAGgeneratesk(m) first U ←R G and derives the rest of σ deterministically from U and k.
Figure 2: Security relations between MACs and resulting 2-round authentication protocols.

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