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hi my name is valerio and i will be talking together with erican hi america about updatable signatures and message authentication codes this is a joint work with sebastien ramaker dennis lamoning and christoph strix in this work we introduce a definitional framework for updatable signatures us and updatable message authentication codes umac the form of the updatability we are interested in is that primitives are key updatable and allow to update all cryptographic objects so in our case signatures or message authentication codes from the old key to the updated key without requiring full access to the new key but only via a so-called update similarly to concrete practical motivations that led to recent works and updatable encryption so for example lemanital from eurocrypt18 we observed that also in the context of signatures and macs itamp;#39;s important to follow good key management practices and to periodically switch keys two possible examples of that are software distribution channe
