22.09论文笔记3:The Security of Blockchain-Based Medical Systems: Research Challenges and Opportunities

A Blockchain-Assisted Privacy-Aware Authentication Scheme for Internet of Medical Things | IEEE Journals & Magazine | IEEE Xplore

基于区块链的医疗系统的安全性:研究挑战和机遇

一.引言

        当前的 COVID-19 ⼤流⾏可能加速了向电⼦医疗系统(例如远程医疗)的转变。然⽽,在医疗保健服务的数字化中,我们必须确保医疗保健数据的安全性和隐私性,这些数据通常存储在医院的本地服务器或远程存储在受信任的云服务器中。已经有很多尝试设计基于区块链的⽅法来⽀持医疗系统的安全性和隐私.

        本篇论文系统地回顾了关于基于区块链的医疗系统的现有⽂献。然后,将现有的安全解决⽅案分为三类,即 1) 去中⼼化⾝份验证、2) 访问控制和 3) 审计,并讨论基于区块链的医疗保健系统中的隐私保护技术。基于分析与研究确定了许多挑战,包括性能限制和不灵活的审计,以及未来的研究机会.

二.背景

        医疗保健+区块链:增强安全性

### CTFHub Challenge-069aeaf042dc3c92 Sandbox Details and Solution CTF challenges often involve a combination of reverse engineering, cryptography, network analysis, and exploitation techniques. For the specific challenge `challenge-069aeaf042dc3c92` on CTFHub, it appears to focus on password cracking using tools like **hashcat**, as well as analyzing JavaScript-based signing mechanisms. #### Password Cracking with Hashcat The process involves capturing an NTLMv2-SSP hash from a target system and attempting to crack it using brute force or dictionary attacks. The command provided demonstrates how this can be achieved: ```bash hashcat -m 5600 hash.txt pass.txt ``` Here, `-m 5600` specifies that the input hash is in NTLMv2 format[^1]. This approach requires preparing both the captured hash (stored in `hash.txt`) and a suitable wordlist (`pass.txt`). Upon successful execution, the tool reveals the plaintext password associated with the Administrator account, which was identified as `123.com`. #### Analyzing Byte-Signing Mechanisms In addition to password recovery tasks, some challenges may also require understanding complex web application security features such as signature generation algorithms used by platforms like TikTok. In these cases, identifying key functions within external scripts plays a crucial role. For instance, when dealing with sign values generated through calls made via `byted_acrawler`, one must trace its implementation back to resources hosted at URLs similar to: https://sf1-ttcdn-tos.pstatp.com/obj/ttfe/rc/acrawler.js This script contains logic necessary for producing valid signatures required during API requests[^2]. By combining knowledge about common attack vectors against authentication systems along with detailed examination into custom client-side protections implemented across various services, participants gain valuable insights applicable beyond just solving individual puzzles but enhancing overall cybersecurity skills too! ```javascript // Example Code Snippet Showing How To Use Acrawler Script const acrawler = require('./acrawler'); // Assuming local copy downloaded earlier. let result = await acrawler(); console.log(result); ```
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