Paper 2012/250

New Identity Based Encryption And Its Proxy Re-encryption

Xu An Wang and Xiaoyuan Yang


Identity based encryption (IBE) has received great attention since Boneh and Franklin's breakthrough work on bilinear group based IBE [4]. Till now, many IBE schemes relying on bilinear groups with diff erent properties have been proposed [5, 25, 29, 14]. However, one part of the user's private key in all these IBE schemes is constructed as y = f(msk), where msk is the master key and y is an element in the underlying bilinear group G. In this paper, we propose a new IBE: one part of the private key is y = f(msk), where msk is the master key and y is an element in Z_p . Here p is the underlying bilinear group's prime order. By using some novel techniques, we prove this new IBE is semantic secure under the selective identity chosen plaintext attacks (IND-sID-CPA) in the standard model. Based on this IBE scheme, we construct an IND-ID-CCA secure identity based proxy re-encryption (IBPRE) scheme which is master secret secure and efficient for the proxy compared with other IND-ID-CCA (IBPRE) schemes.

Available format(s)
Public-key cryptography
Publication info
Published elsewhere. Unknown where it was published
Contact author(s)
wangxahq @ yahoo com cn
2012-05-03: revised
2012-05-03: received
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      author = {Xu An Wang and Xiaoyuan Yang},
      title = {New Identity Based Encryption And Its Proxy Re-encryption},
      howpublished = {Cryptology ePrint Archive, Paper 2012/250},
      year = {2012},
      note = {\url{}},
      url = {}
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