By Keisuke Tanaka, Yuji Suga
This e-book constitutes the complaints of the tenth foreign Workshop on protection, IWSEC 2015, held in Nara, Japan, in August 2015. The 18 complete papers and three brief papers provided during this quantity have been conscientiously reviewed and chosen from fifty eight submissions. They have been prepared in topical sections named: identity-based encryption; elliptic curve cryptography; factoring; symmetric cryptanalysis; provable safeguard; LWE-based encryption; privacy-preserving and anonymity; safe protocol; platforms safeguard; and safety in hardware.
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Additional info for Advances in Information and Computer Security: 10th International Workshop on Security, IWSEC 2015, Nara, Japan, August 26-28, 2015, Proceedings
Then, it outputs the key update kuID|k−1 ,T . DKGen(skID|k , kuID|k−1 ,T ): This algorithm takes as input skID|k of ID|k and kuID|k−1 ,T , and outputs the decryption key dkID|k ,T of ID|k at time T if ID|k is not revoked at T by the parent. Adaptive-ID Secure Revocable Hierarchical Identity-Based Encryption 25 Enc(M, ID, T ): This algorithm takes as input a message M , ID and the current time T and outputs the ciphertext CT. Dec(CT, dkID,T ): This algorithm takes as input CT and dkID,T , and outputs the message.
Next, a secret key is changed to be semi-functional one by one. Though each skID contains O(log N )-size subkeys, we replace all subkeys simultaneously since the diﬀerences of subkeys are randomness part only. Finally, the plaintext of the challenge ciphertext is replaced as a random value. As the most diﬀerent point between HIBE and RHIBE, an adversary is allowed to obtain the secret key of the challenge identity (or its ancestors). In the scheme, for history-free update, no ancestor’s secret value is contained in secret keys.
Z ,θ 35 = a0 I0 + · · · + aj Ij + b, and chooses rθ , zθ , tθ , wθ , $ ← Zn for each θ, and computes T w (Pθ−1 g α (uI00 · · · ujj h)rθ (u h )tθ (Y2 Y3 )zθ zk , g rθ (Y2 Y3 )wθ zk , g tθ X3 θ , I θ (Y2 Y3 )zj+1,θ zk , . . , urθ (Y2 Y3 )z ,θ zk ) urj+1 θ . For the i-th secret key query ID|j where ID|j = (I0 , . . , Ij ) and i < k, B generates a semi-functional secret key skID|j as follows. B sets zk = a0 I0 + · · · + aj Ij + b, chooses rθ , zθ , tθ , wθ , wθ , zj+1,θ , . . , z ,θ $ ← Zn for each θ, and computes T w (Pθ (uI00 · · · ujj h)rθ (u h )tθ (Y2 Y3 )zθ zk , g rθ (Y2 Y3 )wθ zk , g tθ X3 θ , I θ (Y2 Y3 )zj+1,θ zk , .