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( Fen Wang ),( Yang Lu ),( Zhongqi Wang ),( Jinmei Tian ) 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.1
Public key encryption with keyword search (PEKS) allows a user to make search on ciphertexts without disclosing the information of encrypted messages and keywords. In practice, cryptographic operations often occur on insecure devices or mobile devices. But, these devices face the risk of being lost or stolen. Therefore, the secret keys stored on these devices are likely to be exposed. To handle the key exposure problem in PEKS, the notion of key-updatable PEKS (KU-PEKS) was proposed recently. In KU-PEKS, the users’ keys can be updated as the system runs. Nevertheless, the existing KU-PEKS framework has some weaknesses. Firstly, it can’t update the keyword ciphertexts on the storage server without leaking keyword information. Secondly, it needs to send the search tokens to the storage server by secure channels. Thirdly, it does not consider the search token security. In this work, a new PEKS framework named key-updatable and ciphertext-sharable PEKS (KU-CS-PEKS) is devised. This novel framework effectively overcomes the weaknesses in KU-PEKS and has the ciphertext sharing function which is not supported by KU-PEKS. The security notions for KU-CS-PEKS are formally defined and then a concrete KU-CS-PEKS scheme is proposed. The security proofs demonstrate that the KU-CS-PEKS scheme guarantees both the keyword ciphertext privacy and the search token privacy. The experimental results and comparisons bear out that the proposed scheme is practicable.
Kai Zang,Xiaoyi Wang,Zhongqi Yang,Ke Wei,Jian Jun Duan 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.1
Agrilus fleischeri Obenberger (Coleoptera: Buprestidae) is anemerging pest of poplar trees in northeast China, and is responsible for poplarmortality throughout its range. Its biology and natural enemieswere studied at two field locations from 2013 to 2015 as well as via laboratory experiments. Life history of A. fleischeri was univoltine on exotic Populus nigra var. italica and overwintered asmature larvae in pupal chambers; however,was semivoltine on native Populus davidiana and overwintered as 2nd or 3rd instar larvae in Liaoning Province, China. Adults emerged fromlateMay to mid-Augustwith a peak in early June. Eggswere first discovered in early June and continued to late August. Larvae fed frommid-June to late September of univoltine or frommid-June to the next early September of semivoltine. The sex ratio of adult beetleswas approximately 1:1 (M:F).Mean longevities of female and male adults were 34.87 ± 18.70 and 34.33 ± 18.10 days, respectively. Mean duration of egg stage was 12.83±1.10 days and pupal duration 26.40±1.32 days.Mortality in the fieldwas mainly caused by parasitoids; however, pathogens, predators, and host tree resistance were also noted. The egg parasitoids, Oobius spp. attacked 48.0% and 6.48% of A. fleischeri eggs in P. nigra var. italica and P. davidiana, respectively. Polystenus rugosus and Paramblynotus sp. parasitized 0.71% and 52.17% of larvae in P. nigra var. italica respectively. Euderus fleischeri, Polystenus rugosus, andSpathius sp.were found in P. davidianawith parasitismrates of 7.63%, 4.83%, and 0.25% respectively.
Ji-Doo Park,Jong Wook Lee,Il-Kwon Park,Chul Su Kim,Sang-Gil Lee,Sang-Chul Shin,Zhongqi Yang,Maoling Sheng,Mun-Jang Jeon,변봉규 한국응용곤충학회 2007 Journal of Asia-Pacific Entomology Vol.10 No.4
An ichneumon species, Endasys liaoningensis Wang et al., is reported for the first time from Korea. Morphological characteristics of adults are redescribed with illustrations. In addition, the biological characteristics and their distributional ranges are discussed.
Park, Ji-Doo,Lee, Jong-Wook,Park, Il-Kwon,Kim, Chul-Su,Lee, Sang-Gil,Shin, Sang-Chul,Yang, Zhongqi,Sheng, Maoling,Jeon, Mun-Jang,Byun, Bong-Kyu Korean Society of Applied Entomology 2007 Journal of Asia-Pacific Entomology Vol.10 No.4
An ichneumon species, Endasys liaoningensis Wang et al., is reported for the first time from Korea. Morphological characteristics of adults are redescribed with illustrations. In addition, the biological characteristics and their distributional ranges are discussed.