Divisible On-Line/Off-Line Signatures

  • Chong-zhi Gao
  • Baodian Wei
  • Dongqing Xie
  • Chunming Tang
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5473)


On-line/Off-line signatures are used in a particular scenario where the signer must respond quickly once the message to be signed is presented. The idea is to split the signing procedure into two phases: the off-line and on-line phases. The signer can do some pre-computations in off-line phase before he sees the message to be signed.

In most of these schemes, when signing a message m, a partial signature of m is computed in the off-line phase. We call this part of signature the off-line signature token of message m. In some special applications, the off-line signature tokens might be exposed in the off-line phase. For example, some signers might want to transmit off-line signature tokens in the off-line phase in order to save the on-line transmission bandwidth. Another example is in the case of on-line/off-line threshold signature schemes, where off-line signature tokens are unavoidably exposed to all the users in the off-line phase.

This paper discusses this exposure problem and introduces a new notion: divisible on-line/off-line signatures, in which exposure of off-line signature tokens in off-line phase is allowed. An efficient construction of this type of signatures is also proposed. Furthermore, we show an important application of divisible on-line/off-line signatures in the area of on-line/off-line threshold signatures.


Signature Schemes Divisible On-line/Off-line Signatures On-line/Off-line Threshold Signatures 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Chong-zhi Gao
    • 1
  • Baodian Wei
    • 2
  • Dongqing Xie
    • 1
  • Chunming Tang
    • 3
  1. 1.School of Computer ScienceGuangzhou UniversityGuangzhouChina
  2. 2.Department of Electronics and Communication EngineeringSun Yat-sen UniversityGuangzhouChina
  3. 3.Institute of Information SecurityGuangzhou UniversityGuangzhouChina

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