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The simplest solution is to rely on identity-based signatures. A trusted third party (TTP) defines a set of RSA keys $\mathit{mpk} = \{N,e\}$ and $\mathit{msk} = \{p,q,d\}$ where $N = pq$ for two large primes $p,q$ and $e,d$ such that $e \cdot d \equiv 1 \pmod {(p-1)(q-1)}$. Key $\mathit{mpk}$ is public and is used to check the correctness of signatures; ...

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