Arbitrated digital signatures Requires an unconditionally ttp as part of the signature generation and signature verification Each entity shares a symmetric key with the tTP Symmetric key cryptography results in a very fast algorithm However, this speedup is overshadowed by the TtP as well as communication overhead9 Arbitrated Digital Signatures • Requires an unconditionally TTP as part of the signature generation and signature verification. • Each entity shares a symmetric key with the TTP • Symmetric key cryptography results in a very fast algorithm • However, this speedup is overshadowed by the TTP as well as communication overhead