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In large-scale communication nodes network,there are a large number of network nodes and so many types of equipment.So there are problems of certificate management difficulties and resource waste in the tradi-tional PKI cryptosystem.A mutual node authentication scheme based on identity-based encryption,which solved the problem of the digital certificate management in the PKI system by the identity-based encryption and the key escrow problem in identity based cryptograph by splitting the key as well,was designed.At the same time,the introduction of random factor,timestamp and hash algorithm in the authentication protocol prevented various network attacks.Finally,the security and efficiency of the encryption algorithm and the security of the authentication protocol were analyzed,which proved the security and reliability of the authentication scheme.

Considering that the existing file safe deposit boxes lack online authentication and server authorization,a file safe deposit box based on authentication and authorization was designed and achieved.This system firstly identified the users of the file box online,thus avoiding the illegal users to login.Moreover,the master collected the operation events exerted on the files in the clients,and the master provided a granular authentication for the operation of users,thus avoiding the illegal operation and incorrect operation.The test of this system proved that it can be able to achieve the preset functions and can be widely used in many conditions.

Background and Purpose: Aeromonas spp. often cause infections in immunocompromised patients. To specifically understand the clinical features of Aeromonas bacteremic adults with hematologic malignancies, we investigated the demographic, clinical and microbiologic characteristics of Aeromonas bacteremia in this patient population., Methods: Retrospective study performed in a tertiary medical center in southern Taiwan, in which adults with hematologic malignancies suffered from Aeromonas bacteremia admitted between 1995 and 2003 were included for study., Results: There were 45 episodes of Aeromonas bacteremia in 41 adults with hematologic malignancies. Episodes of Aeromonas bacteremia which occurred at least 2 months apart were counted as separate cases in the analysis. A total of 30 men and 15 women (mean age: 53.2 years), with 4 patients experiencing 2 episodes, was included. The 3 leading underlying hematologic malignancies were acute myelogenous leukemia (37.8%), myelodysplastic syndrome (26.7%) and non-Hodgkin's lymphoma (17.8%). No cluster of Aeromonas bacteremia was found during the study period. Twenty nine (64.4%) of the 31 patients with nosocomial Aeromonas bacteremia had received recent antineoplastic chemotherapy. The 3 leading clinical manifestations were fever (88.9%), septic shock (40%), and altered consciousness (26.7%). Eleven (24.4%) episodes of bacteremia were polymicrobial. Sixteen (35.6%) patients died within 14 days of onset of bacteremia. The mean duration from sampling blood for culture to death was 3.81 days. Altered consciousness (odds ratio, 8.999; 95% confidence interval, 1.787-45.33; p=0.008) was the only independent prognostic factor for mortality. High resistance rates (11.1% to piperacillin and 35.6% to imipenem) among Aeromonas isolates were also noted., Conclusion: In febrile patients with hematologic malignancies and suspected Aeromonas infections, particular attention to the development of alteration of consciousness is needed as it is an independent risk factor for mortality.