TY - JOUR
T1 - An ID-based group-oriented decryption scheme secure against adaptive chosen-ciphertext attacks
AU - Chang, Ting Yi
PY - 2009/11/15
Y1 - 2009/11/15
N2 - ID-based decryption allows a sender to encrypt a message to an identity without access to a public key certificate. This paper proposes an ID-based group-oriented decryption scheme, secure against adaptive chosen-ciphertext attacks, which allows the sender to determine an access structure and generate a valid ciphertext on the chosen message. The correctness of decryption shares can be checked to detect when dishonest users in the access structure provide fake decryption shares. As a result, the message can be cooperatively recovered by users in the determined access structure. The formal proof of security of our scheme is based on the bilinear Diffie-Hellman problem in the random oracle model. Our proposed scheme is more efficient and provides higher security confidence than those in Li et al.'s certificate-based group-oriented decryption scheme.
AB - ID-based decryption allows a sender to encrypt a message to an identity without access to a public key certificate. This paper proposes an ID-based group-oriented decryption scheme, secure against adaptive chosen-ciphertext attacks, which allows the sender to determine an access structure and generate a valid ciphertext on the chosen message. The correctness of decryption shares can be checked to detect when dishonest users in the access structure provide fake decryption shares. As a result, the message can be cooperatively recovered by users in the determined access structure. The formal proof of security of our scheme is based on the bilinear Diffie-Hellman problem in the random oracle model. Our proposed scheme is more efficient and provides higher security confidence than those in Li et al.'s certificate-based group-oriented decryption scheme.
UR - http://www.scopus.com/inward/record.url?scp=69249215230&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=69249215230&partnerID=8YFLogxK
U2 - 10.1016/j.comcom.2009.07.005
DO - 10.1016/j.comcom.2009.07.005
M3 - Article
AN - SCOPUS:69249215230
VL - 32
SP - 1829
EP - 1836
JO - Computer Communications
JF - Computer Communications
SN - 0140-3664
IS - 17
ER -