Self-healing Group Research Articles

A location-updating based self-healing group key management scheme for VANETs

A location-updating based self-healing group key management scheme for VANETs

Fish collagen sponge with human umbilical cord mesenchymal stem cells for diabetic wound repair in rats.

Stem cell therapy offers a novel approach to treating difbetic foot ulcers. Fish skin decellularized matrix, a type I collagen, provides a promising carrier for stem cells, creating a supportive microenvironment that enhances cell survival and therapeutic potential. This study aims to investigate the effects and mechanisms of human umbilical cord mesenchymal stem cells (HUCMSCs) loaded onto a fish collagen sponge for wound healing in diabetic rats. The study evaluates stem cell-loading efficiency with fish collagen sponge in vitro, assesses material distribution on diabetic rat wounds, and establishes a wound model. Rats are divided into the Self-healing group, Fish collagen sponge group, and Sponge loaded with HUCMSCs group. Therapeutic effects are evaluated through various analyses, including histopathology and reverse transcription polymerase chain reaction for collagen-related gene expression levels. Compared to the self-healing group, both the fish collagen group and the composite group show faster wound repair and improved healing outcomes. The composite group exhibits superior wound healing quality, with fish collagen contributing to enhanced tissue regeneration through collagen regulation at the wound site. Loading HUCMSCs onto a fish collagen sponge shows promise for treating diabetic wounds by addressing nutrient deficiency and cell supply issues, offering potential benefits for patients undergoing treatment.

Temporal and spatial expression analysis of periostin in mice periodontitis model.

This study aimed to investigate the temporal and spatial changes in the expression of periostin during periodontal inflammation in mice. A periodontitis model was constructed using silk thread ligation. Mice were randomly divided into five groups including control group, 4-day ligation group, 7-day ligation group, 14-day ligation group, and self-healing group (thread removal for 14 days after 14-day ligation). Micro-CT and histological staining were performed to characterize the dynamic changes in the mouse periodontal tissue in each group. RNAscope and immunohistochemical staining were used to analyze the pattern of changes in periostin at various stages of periodontitis. The cell experiment was divided into three groups: control group, lipopolysaccharide (LPS) stimulation group (treated with LPS for 12 h), and LPS stimulation removal group (treated with LPS for 3 h followed by incubation with medium for 9 h). Quantitative real-time polymerase chain reaction (qRT-PCR) was used to detect the expression of periostin, transforming growth factor-β1 (TGF-β1), and matrix metalloproteinase 2 (MMP2). Significant alveolar bone resorption was observed 7 days after ligation. With increasing duration of ligation, the damage to the mouse periodontal tissue was aggravated, which manifested as increased osteoclasts, widening of the periodontal membrane space, and decreased alveolar bone height. Some degree of periodontal tissue repair was observed in the self-healing group. Periostin expression decreased at 4 and 7 days compared with the control group and increased at 14 days compared with 4 and 7 days. A significant recovery was found in the self-healing group. The qRT-PCR results showed that the expression of periostin and TGF-β1 in the LPS stimulation group decreased compared with that in the control group but significantly recovered in the LPS removal group. Periostin expression in the PDL of mice showed a downward and upward trend with inflammation progression. The significant recovery of periostin expression after removing inflammatory stimuli may be related to TGF-β1, which is crucial to maintain the integrity of the PDL.

Mental health associated with the cluster of childhood trauma and resilience among nursing students: A cross-sectional study.

This study aimed to propose clusters of the association between childhood trauma and resilience in nursing students and to examine their mental health according to these clusters. A cross-sectional study was carried out between September 2018 and May 2019. A total of 1,245 undergraduate nursing students (104 male, 1,141 female) were enrolled in a medical university in East China to complete the Childhood Trauma Questionnaire, Connor-Davidson Resilience Scale, Self-Rating Anxiety Scale, and Self-Rating Depression Scale. The cluster analysis identified three clusters as follows: the self-healing group (40.7%), the mildly traumatized with low resiliency group (22.2%), and the healthy group (37.1%). The logistic regression analysis revealed that the levels of anxiety and depression significantly differed between the three clusters, with the mildly traumatized with low resiliency group having the highest odds to have anxiety and depression. This study identified three clusters of the association between childhood trauma and resilience in undergraduate nursing students and indicated that each cluster was associated with a different level of anxiety and depression. The unique characteristics of the three clusters may help identify and develop appropriate interventions to promote the mental health of undergraduate nursing students. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Intestinal mucosal flora of the intestine-kidney remediation process of diarrhea with deficiency kidney-yang syndrome in Sishen Pill treatment: Association with interactions between Lactobacillus johnsonii, Ca2+-Mg2+-ATP-ase, and Na+-K+-ATP-ase

This study aims to investigate the effect of Sishen Pill on the characteristics of gut mucosal microbiota in diarrhea mice with deficiency kidney-yang syndrome. Fifteen Kunming male mice were randomly divided into Normal control group (C), Model self-healing group (X) and Sishen Pill group (S), with 5 mice/cages. Hematoxylin eosin (HE) staining was used to observe the kidney structure. Serum Na+-K+-ATP-ase and Ca2+-Mg2+-ATP-ase were detected by enzyme-linked immunosorbent assay (ELISA), Analysis of intestinal mucosal flora using third-generation high-throughput sequencing. The relative abundance results in the three groups revealed that the dominant bacterial genera: Lactobacillus, Muribaculum and Candidatus-Arthromitus; bacterial species: Lactobacillus johnsonii, Lactobacillus reuteri, Lactobacillus murinus, and Lactobacillus intestinalis, and differences in the presence of major microbiota between the X and S groups. A positive correlation between Lactobacillus johnsonii and both Ca2+-Mg2+-ATP-ase and Na+-K+-ATP-ase was found via correlation analysis. Sishen Pill also changed the manufacture of other secondary metabolites, as well as the metabolism of carbohydrates, glycans, energy, lipids, and other amino acids, and xenobiotics biodegradation and metabolism. In conclusion, Sishen Pill improved kidney structure, energy metabolism and the diversity and structure of intestinal mucosal flora. In addition, Lactobacillus johnsonii may be a characteristic species of Sishen Pill in treating diarrhea with kidney-yang deficiency syndrome.

Role of Oral Supplementation of Damiana (Turnera diffusa) Reduces the Renal Toxicity, Apoptosis and DNA Damage Associated with Amitriptyline Administration in Rats

Major depressive disorder and anxiety disorders are two mental diseases that are treated with amitriptyline (AMT). AMT treatments induced liver, heart and testes toxicity; As a result, the purpose of this study was to determine the preventative and therapeutic role of damiana (Dam) as adjuvant herbal therapy against AMT induced heart injury in rats. Six groups of 36 rats (male albino) were randomly assigned; first one is control, second is Dam, third was AMT, fourth was Dam+AMT, fifth was AMT+Dam and sixth was AMT self-healing. A significant elevation in creatinine, urea, sodium (Na+), Chloride (Cl+), renal injury, DNA damage and apoptosis in treatment rats with amitriptyline and self-healing group as related to control and damiana groups. Conversely; potassium (K+) and calcium (Ca++) were a significant decrease in AMT and self-healing groups as compared with control. Treatment of AMT with Dam (Co and Post) revealed a modulation and improvement of renal toxicity with best result in co- treatments than post treatments. As a result, AMT treatments encouraged changes in kidney functions and structure and the post-treatments of AMT with dam modulates these alterations.

Green synthesis of silver nanoparticles through oil: Promoting full-thickness cutaneous wound healing in methicillin-resistant Staphylococcus aureus infections.

Due to the emergence of multi-drug resistant microorganisms, the development and discovery of alternative eco-friendly antimicrobial agents have become a top priority. In this study, a simple, novel, and valid green method was developed to synthesize Litsea cubeba essential oil-silver nanoparticles (Lceo-AgNPs) using Lceo as a reducing and capping agent. The maximum UV absorbance of Lceo-AgNPs appeared at 423 nm and the size was 5–15 nm through transmission electron microscopy result. The results of Fourier transform infrared and DLS showed that Lceo provided sufficient chemical bonds for Lceo-AgNPs to reinforce its stability and dispersion. The in vitro antibacterial effects of Lceo-AgNPs against microbial susceptible multidrug-resistant Escherichia coli (E. coli) and methicillin-resistant Staphylococcus aureus (MRSA) were determined. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of Lceo-AgNPs against E. coli were 25 and 50 μg/ml. The MIC and MBC of Lceo-AgNPs against MRSA were 50 and 100 μg/ml, respectively. The results of scanning electron microscopy showed that the amount of bacteria obviously decreased and the bacteria cells were destroyed by Lceo-AgNPs. In vivo research disclosed significant wound healing and re-epithelialization effects in the Lceo-AgNPs group compared with the self-healing group and the healing activity was better than in the sulfadiazine silver group. In this experiment, Lceo-AgNPs has been shown to have effects on killing multidrug-resistant bacteria and promoting wound healing. This study suggested Lceo-AgNPs as an excellent new-type drug for wound treatment infected with multidrug-resistant bacteria, and now expects to proceed with clinical research.

Integrated strategy for mechanism of Baitouweng Decoction in treating dampness-heat diarrhea based on urine metabolomics coupled with network pharmacology

Baitouweng Decoction is a famous Chinese medicinal decoction that has been used to treat diarrhea over thousands of years. In this study, we investigated the effect and mechanism of Baitouweng Decoction in the treatment of diarrhea. Wistar rats were randomly assigned into 4 groups: control group, dampness-heat diarrhea model group(modeling by complex factors including high-sugar and high-fat diet, improper diet, hot and humid environment, drinking and intraperitoneal injection of Escherichia coli), Baitouweng Decoction(3.6 g·kg~(-1)) group, and self-healing group. A urine metabolomics approach was developed with ultra liquid chromatography-quadrupole-time-of-flight-mass spectrometry(UPLC-Q-TOF-MS) for metabolic profiling. The differential metabolites were screened out by the multivariate comparison between groups. Diarrhea-related protein targets and the active compounds of Baitouweng Decoction were used to predict the protein targets of Baitouweng Decoction. Cytoscape 3.2.1 was employed to establish a active component-target protein interaction network. Three protein-protein interaction(PPI) networks of component target proteins, diarrhea-related proteins, and differential metabolite-related proteins were established and then merged by BisoGenet. ClueGO was used to perform the gene enrichment based on the genetic similarity. The results showed that Baitouweng Decoction effectively treated dampness-heat diarrhea in vivo. N-acetylserotonin, L-gamma-glutamylcysteine, glutathione, retinoate, melatonin, indole-3-acetaldehyde, L-cystine, biotin, and L-tryptophan were screened as differential metabolites in dampness-heat diarrhea model group. Tryptophan metabolism, glutathione metabolism, biotin metabolism, retinol metabolism, and cysteine and methionine metabolism were involved in the therapeutic effect of Baitouweng Decoction in vivo. A total of 167 targets were identified as major candidates for diarrhea progression. The gene-set enrichment revealed that the targets were involved in reactive oxygen species production, inflammation, and apoptosis. Baitouweng Decoction can restrain inflammation, production of reactive oxygen, and block apoptosis, thereby contributing to the treatment of dampness-heat diarrhea.

Regulatory Effect of Lactiplantibacillus plantarum 2-33 on Intestinal Microbiota of Mice With Antibiotic-Associated Diarrhea.

Diarrhea is one of the common adverse reactions in antibiotic treatment, which is usually caused by the imbalance of intestinal flora, and probiotics play an important role in the structure of intestinal flora. Therefore, this experiment studied the regulatory effect of Lactiplantibacillus plantarum 2-33 on antibiotic-associated diarrhea (AAD) mice. First, the AAD mice model was established by the mixed antibiotic solution of gentamicin sulfate and cefradine. Then, the physiological indexes and diarrhea of mice were observed and recorded by gastric perfusion of low dose (1.0 × 107 CFU/ml), medium dose (1.0 × 108CFU/ml), and high dose (1.0 × 109 CFU/ml) strain 2-33. 16S rRNA gene V3-V4 regions were sequenced in colon contents of mice in control group, model group, self-healing group, and experimental group, respectively, and the diversity of intestinal flora and gene function prediction were analyzed. The results showed that the intestinal flora of AAD mice was not significantly regulated by gastric perfusion of strain 2-33 to 7 days, but the relative abundance and diversity of intestinal flora of AAD mice were significantly improved by gastric perfusion to 14 days (p < 0.05). In addition, at the genus level, the relative abundance of Lactobacillus increased significantly, and the relative abundance of Enterococcus and Bacillus decreased significantly (p < 0.05). In addition, the regulation of strain 2-33 on intestinal flora of AAD mice was time- and dose-dependent, short-term gastric perfusion, and low dose had no significant effect (p > 0.05). Strain 2-33 can significantly increase the levels of anti-inflammatory cytokines IL-4 and IL-10, significantly decrease the levels of proinflammatory cytokines TNF-α and IFN-γ (p < 0.05), and can also adjust carbohydrate metabolism, amino acid metabolism, and energy metabolism to normal levels, thus accelerating the recovery of intestinal flora structure of AAD mice. In summary, strain 2-33 can improve the structure and diversity of intestinal flora of AAD mice, balance the level of substance and energy metabolism, and play a positive role in relieving diarrhea, maintaining and improving the intestinal microecological balance.

Does Oxygen Content Play a Role in Spontaneous Closure of Perimembranous Ventricular Septal Defects?

(1) Background: the impact of a series of laboratory parameters (haemoglobin, haematocrit, foetal haemoglobin, peripheral oxygen saturation, iron, transferrin, ferritin, and albumin) on perimembranous ventricular septal defects spontaneous healing was tested. (2) Methods: one hundred and seven patients were enrolled in the study (57% males; mean age 2.1 ± 0.4 years) and were subsequently subdivided into two groups: self-healing (n = 36) and in need of intervention (n = 71). Self-healing subjects were defined on the basis of an absence of residual shunts at colorDoppler across the previous defect. (3) Results: no statistically significant differences were reported in the size of perimembranous ventricular septal defects between the two groups (p = ns). Conversely, prevalence of anaemia was significantly higher in those requiring intervention than in the self-healing group (p < 0.03), while haemoglobin, iron, ferritin, and albumin levels were lower (p < 0.001, p < 0.05, p < 0.02, p < 0.007, respectively). In multivariable linear regression analysis, only haemoglobin and albumin were found to be associated with spontaneous closure (p < 0.005 and p < 0.02, respectively). In multiple logistic regression analysis, haemoglobin independently increased the probability of self-healing of perimembranous ventricular septal defects (p = 0.03). All patients needing an interventional closure of perimembranous ventricular septal defects presented with haemoglobin <12.7 g/dL. (4) Conclusion: the self-resolution of perimembranous ventricular septal defects seems to rely on numerous factors, including oxygen content, which is likely to promote cell proliferation as well as tissue regeneration. Haemoglobin blood concentration seems to influence the natural history of perimembranous ventricular septal defects and improvement of anaemia by supplementation of iron intake might represent a simple and reliable method to promote self-healing.

Self-Healing Group Key Distribution Facilitating Source Authentication Using Block Codes

Secure group key distribution is essential for many group-oriented applications such as sensor networks, multimedia broadcast services, and Internet of Things (IoT) scenarios. There are several challenges and requirements in designing secure group key distribution. Among them, computational efficiency, communication efficiency, adaptability to dynamic group membership change, robustness to various security threats, self-healing capacities, and source authentication are desirable. It is very challenging to design an efficient group distribution that satisfies all the requirements and challenges. Based on block codes, we propose an efficient self-healing group key distribution that facilitates both message source authentication and secure group key distribution, where the source identification and authentication can facilitate intrusion detection and identification. Both the privacy of the group key and the authentication of message sources are computationally secure. To the best of our knowledge, it is the first codes-based scheme that satisfies all the above requirements and facilitates message source authentication. The merits of the proposed scheme include the following: (1) it is highly efficient in terms of computation and communication, (2) it provides self-healing capacities for unstable environments, (3) it is very robust to various security threats and attacks, (4) it facilitates both message source authentication and secure group key distribution, and (5) it greatly improves the communication performance, compared to the state-of-the-art schemes. The security properties are analyzed, and the performance evaluations confirm its efficiency and practicality.

Treatment of oxidative stress, apoptosis, and DNA injury with N-acetylcysteine at simulative pesticide toxicity in fish

Pesticide toxicities are common in aquatic ecosystems and affects aquatic livings negative. Therefore, it is important to strengthen the antioxidant system in aquatic organisms and to protect the organisms against these toxic chemicals. In this study, the simulative toxicity was established to the fish then the healing process was followed. For this purpose, rainbow trout Oncorhynchus mykiss exposed to cypermethrin and left to the recovery process with either N-acetyl cysteine (an antioxidant, 0.5 mM–1.0 mM concentrations) or no intervention (self-healing) for 96 h. In this context, paraoxonase (PON), arylesterase (AR), myeloperoxidase (MPO), antioxidant enzymes (SOD, CAT, GPx), acetylcholinesterase (AChE) activities as well as MDA, caspase-3 and 8-OHdG levels were measured in fish gills, liver and kidney tissues. In addition, trace element tests were performed in the tissues sampled for each group. At the result of pesticide exposure, SOD, CAT, GPx, PON, AR and AChE activities were increased but MDA, MPO, caspase-3 and 8-OHdG levels were decreased in N-acetyl cysteine (NAC) treated groups in all tissues compared to self-healing group (p < 0.05). When the element analysis of the samples was examined, tissue-based differences were observed significantly in all application groups (p < 0.05). Considering the results of the study, it was found that NAC administration at high concentration (1.0 Mm NAC) was more effective on pesticide toxicity. It was concluded that the most sensitive tissue was the kidney.

Pulsatilla Decoction Can Treat the Dampness-Heat Diarrhea Rat Model by Regulating Glycerinphospholipid Metabolism Based Lipidomics Approach.

Ethnopharmacological RelevanceDiarrhea is a major medical problem in clinical practice. According to the theory of traditional Chinese medicine (TCM), different types of diarrhea should be treated with different TCM formulations based on the targeted medical condition. Dampness-heat diarrhea (DHD) is a serious diarrheal disease and Pulsatilla decoction (PD), a TCM, has been found effective against DHD.ObjectiveThe aim of this study was to clarify the mechanism of action of PD in DHD using an untargeted lipidomics strategy.Materials and MethodsWistar rats were randomized to four groups, including the control group, model group, PD groups and self-healing group. The PD groups were given a daily intragastric gavage of PD at doses of 3.76 g/kg. The rat model of DHD established by such complex factors as high-sugar and high-fat diet, improper diet, high temperature and humidity environment, drinking and intraperitoneal injection of Escherichia coli., which imitated the inducing conditions of DHD. Then the clinical symptoms and signs, blood routine, serum inflammatory cytokines levels and the histopathological changes of main organs were detected and observed to evaluate DHD model and therapeutic effect of PD. Lipid biomarkers of DHD were selected by comparing the control and model groups with the colon lipidomics technology and an ultra-high performance liquid chromatography (UHPLC) coupled with Q Exactive plus mass analyzer. Multivariate statistical analysis and pattern recognition were employed to examine different lipids within the colon of PD-treated rats.ResultsThe clinical symptoms and signs of the model rats were consistent with the diagnostic criteria of DHD. After treatment with PD, the clinical symptoms and signs of the rats with DHD were improved; the indexes of blood routine and inflammatory cytokines levels tended to be normal. The lipidomics profile of the model group were evidently disordered when compared to the control group. A total of 42 significantly altered lipids between the model-control groups were identified by multivariate statistical analysis. DHD may result from such lipid disorders which are related to glycerophospholipid metabolism, arachidonic acid (AA) metabolism, and sphingolipid metabolism. After PD treatment, the lipidomic profiles of the disorders tended to recover when compared to the model group. Twenty lipid molecules were identified and some glycerophospholipids and AA levels returned close to the normal level.ConclusionGlycerophospholipid metabolism may play an important role in the treatment of dampness-heat induced diarrhea using PD.

Self-healing group key distribution protocol in wireless sensor networks for secure IoT communications

The Internet of Things(IoT) aims to collect a large amount of data and exchange them over wireless networks by connecting billions of perception objects. Security becomes essential for IoT since unreliable wireless networks often create insecure connections. To ensure the group communication security and improve the communication efficiency, self-healing group key distribution (SGKD) protocols are introduced for unreliable wireless networks. In such scheme, lost session keys can be recovered from the current broadcast messages by the group members, instead of requiring the missing key updating messages to be retransmitted by the group manager. A lot of access-polynomial-based SGKD (AP-SGKD) protocols have been proposed. Unfortunately, almost all of them have secure problems. This paper proposes a new AP-SGKD protocol using double chains and access polynomial. The new protocol is the first AP-SGKD protocol which satisfies all basic security properties with optimal storage requirement. In addition, we propose a method to trade off the session key recovering time for less communication cost. The simulation results show that the new scheme can be applied to Zigbee network since it has a good performance on security, storage efficiency and communication efficiency.

Secure Self-healing Group Key Distribution Scheme with Constant Storage for SCADA Systems in Smart Grid

Smart grid has a great advantage over the traditional power grid and it is a critical condition in people’s daily life. The security of data communication in smart grid is important and needs to be efficiently guaranteed. The supervisory control and data acquisition (SCADA) systems is in charge of supervising the sensitive process. In SCADA systems, the secure communication between control center and remote terminal units can be achieved by the key distribution mechanism. However, the remote terminal units are resource-constrained and sometimes are not available so that they cannot receive the session key updating broadcast. Self-healing is an efficient mechanism to calculate missing session keys by using later broadcast messages. In this paper, we propose an efficient self-healing group key distribution scheme for SCADA systems. The security analysis illustrates that our scheme satisfy the basic security properties defined in security model. According to the performance evaluation from storage and communication cost viewpoints, the proposed scheme is efficient.

A Novel Mutual Healing Group Key Distribution Scheme forWSN

In order to solve the security problems in the existing self-healing group key distribution strategies, this paper proposes a new mutual healing group key distribution scheme. Based on the access polynomials, this scheme can hide the keys by using hash function and enable the communication group nodes to restore the lost session keys through the use of broadcasting messages and private keys. Besides, this scheme can restore the key of the last time with the help of neighbor nodes, which is impossible for the self-healing key distribution scheme. Analytical results show that the proposed scheme can guarantee the forward and backward security and resist the collusion attack, which is suitable for WSN.

On the Security of a Self-Healing Group Key Distribution Scheme

Recently, Wang et al. (J Secur Commun Netw 5(12):1363---1374, 2012) proposed a self-healing group key distribution (SGKD) scheme for resource-constrained wireless networks. They claimed that their proposed SGKD scheme satisfies forward security, backward security and can resist collusion attack. Unfortunately, we found some security flaws in their scheme. In this paper, we present a method to attack this scheme. The attack illustrates that this scheme does not satisfy forward security, which also directly breaks the collusion resistance capability. We also propose an improved scheme with constant storage overhead and satisfactory security.

Exponential Arithmetic Based Self-Healing Group Key Distribution Scheme with Backward Secrecy under the Resource-Constrained Wireless Networks.

In resource-constrained wireless networks, resources such as storage space and communication bandwidth are limited. To guarantee secure communication in resource-constrained wireless networks, group keys should be distributed to users. The self-healing group key distribution (SGKD) scheme is a promising cryptographic tool, which can be used to distribute and update the group key for the secure group communication over unreliable wireless networks. Among all known SGKD schemes, exponential arithmetic based SGKD (E-SGKD) schemes reduce the storage overhead to constant, thus is suitable for the the resource-constrained wireless networks. In this paper, we provide a new mechanism to achieve E-SGKD schemes with backward secrecy. We first propose a basic E-SGKD scheme based on a known polynomial-based SGKD, where it has optimal storage overhead while having no backward secrecy. To obtain the backward secrecy and reduce the communication overhead, we introduce a novel approach for message broadcasting and self-healing. Compared with other E-SGKD schemes, our new E-SGKD scheme has the optimal storage overhead, high communication efficiency and satisfactory security. The simulation results in Zigbee-based networks show that the proposed scheme is suitable for the resource-restrained wireless networks. Finally, we show the application of our proposed scheme.

Improved one-way hash chain and revocation polynomial-based self-healing group key distribution schemes in resource-constrained wireless networks.

Self-healing group key distribution (SGKD) aims to deal with the key distribution problem over an unreliable wireless network. In this paper, we investigate the SGKD issue in resource-constrained wireless networks. We propose two improved SGKD schemes using the one-way hash chain (OHC) and the revocation polynomial (RP), the OHC&RP-SGKD schemes. In the proposed OHC&RP-SGKD schemes, by introducing the unique session identifier and binding the joining time with the capability of recovering previous session keys, the problem of the collusion attack between revoked users and new joined users in existing hash chain-based SGKD schemes is resolved. Moreover, novel methods for utilizing the one-way hash chain and constructing the personal secret, the revocation polynomial and the key updating broadcast packet are presented. Hence, the proposed OHC&RP-SGKD schemes eliminate the limitation of the maximum allowed number of revoked users on the maximum allowed number of sessions, increase the maximum allowed number of revoked/colluding users, and reduce the redundancy in the key updating broadcast packet. Performance analysis and simulation results show that the proposed OHC&RP-SGKD schemes are practical for resource-constrained wireless networks in bad environments, where a strong collusion attack resistance is required and many users could be revoked.

One-way hash chain-based self-healing group key distribution scheme with collusion resistance capability in wireless sensor networks

In order to resolve the collusion resistance problem in the one-way hash chain-based self-healing group key distribution schemes and improve the performance of previous self-healing group key distribution schemes, we propose a self-healing group key distribution scheme based on the revocation polynomial and a special one-way hash key chain for wireless sensor networks (WSNs) in this paper. In our proposed scheme, by binding the time at which the user joins the group with the capability of recovering previous group session keys, a new method is addressed to provide the capability of resisting the collusion attack between revoked users and new joined users, and a special one-way hash chain utilization method and some new methods to construct the personal secret, the revocation polynomial and the key updating broadcast packet are presented. Compared with existing schemes under same conditions, our proposed scheme not only supports more revoked users and sessions, but also provides a stronger security. Moreover, our proposed scheme reduces the communication overhead, and is especially suited for a large scale WSN in bad environments where a strong collusion attack resistance capability is required and many users will be revoked.