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Scalable wildcarded identity-based encryption

Authors
Kim, JihyeLee, SeunghwaLee, JiwonOh, Hyunok
Issue Date
Sep-2018
Publisher
Springer Verlag
Keywords
Constant ciphertext; Key delegation; Pattern; Wildcard identity based encryption
Citation
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), v.11099 LNCS, pp.269 - 287
Indexed
SCOPUS
Journal Title
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume
11099 LNCS
Start Page
269
End Page
287
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/32932
DOI
10.1007/978-3-319-98989-1_14
ISSN
0302-9743
Abstract
Wildcarded identity-based encryption allows a sender to simultaneously encrypt messages to a group of users matching a certain pattern, defined as a sequence of identifiers and wildcards. We propose a new wildcarded identity-based encryption scheme with generalized key delegation, which reduces the ciphertext size to be constant. To the best of our knowledge, our proposal is the first wildcarded identity-based encryption scheme that generates a constant size ciphertext regardless of the depth of the identities. The proposed scheme also improves the decryption time by minimizing the wildcard conversion cost. According to our experiment results, decryption of the proposed scheme is 3, 10, and 650 times faster than existing WIBE, WW-IBE, and CCP-ABE schemes. The proposal also subsumes the generalized key derivation naturally by allowing wildcards in the key delegation process. We prove CPA security of the proposed scheme and extend it to be CCA secure.
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