A Robust Verifiably Encrypted Signature Scheme

  title={A Robust Verifiably Encrypted Signature Scheme},
  author={Jianhong Zhang and Wei Zou},
  booktitle={EUC Workshops},
A verifiably encrypted signature can convince the verifier that a given cipher-text is the encryption of a signature on a given message. It is often used as a building block to construct optimistic fair exchange. Recently, Gu et.al gave an ID-based verifiably encrypted signature scheme and claimed that their scheme was secure in random oracle model. Unfortunately, in this works, we show that their scheme is insecure. And we can mount to universal forgery attack in their model. In other words… CONTINUE READING


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