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* 产品  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 产品  
  [人工智能驱动的网络安全平台](https://www.paloaltonetworks.cn/network-security?ts=markdown)
  
  * [Secure AI by Design](https://www.paloaltonetworks.cn/precision-ai-security/secure-ai-by-design?ts=markdown)
  
  * [Prisma AIRS](https://www.paloaltonetworks.cn/prisma/prisma-ai-runtime-security?ts=markdown)
  
  * [AI Access Security](https://www.paloaltonetworks.cn/sase/ai-access-security?ts=markdown)
  
  * [云交付的安全服务](https://www.paloaltonetworks.cn/network-security/security-subscriptions?ts=markdown)
  
  * [高级威胁预防](https://www.paloaltonetworks.cn/network-security/advanced-threat-prevention?ts=markdown)
  
  * [Advanced URL Filtering](https://www.paloaltonetworks.cn/network-security/advanced-url-filtering?ts=markdown)
  
  * [Advanced WildFire](https://www.paloaltonetworks.cn/network-security/advanced-wildfire?ts=markdown)
  
  * [Advanced DNS Security](https://www.paloaltonetworks.cn/network-security/advanced-dns-security?ts=markdown)
  
  * [企业数据丢失防护](https://www.paloaltonetworks.cn/sase/enterprise-data-loss-prevention?ts=markdown)
  
  * [Enterprise IoT Security](https://www.paloaltonetworks.cn/network-security/enterprise-device-security?ts=markdown)
  
  * [医疗物联网安全](https://www.paloaltonetworks.cn/network-security/medical-iot-security?ts=markdown)
  
  * [工业 OT 安全](https://www.paloaltonetworks.cn/network-security/industrial-ot-security?ts=markdown)
  
  * [SaaS Security](https://www.paloaltonetworks.cn/sase/saas-security?ts=markdown)
  
  * [新一代防火墙](https://www.paloaltonetworks.cn/network-security/next-generation-firewall?ts=markdown)
  
  * [硬件防火墙](https://www.paloaltonetworks.cn/network-security/hardware-firewall-innovations?ts=markdown)
  
  * [软件防火墙](https://www.paloaltonetworks.cn/network-security/software-firewalls?ts=markdown)
  
  * [Strata Cloud Manager](https://www.paloaltonetworks.cn/network-security/strata-cloud-manager?ts=markdown)
  
  * [SD-WAN for NGFW](https://www.paloaltonetworks.cn/network-security/sd-wan-subscription?ts=markdown)
  
  * [PAN-OS](https://www.paloaltonetworks.cn/network-security/pan-os?ts=markdown)
  
  * [Panorama](https://www.paloaltonetworks.cn/network-security/panorama?ts=markdown)
  
  * [Secure Access Service Edge](https://www.paloaltonetworks.cn/sase?ts=markdown)
  
  * [Prisma SASE](https://www.paloaltonetworks.cn/sase?ts=markdown)
  
  * [应用加速](https://www.paloaltonetworks.cn/sase/app-acceleration?ts=markdown)
  
  * [自主数字体验管理](https://www.paloaltonetworks.cn/sase/adem?ts=markdown)
  
  * [企业 DLP](https://www.paloaltonetworks.cn/sase/enterprise-data-loss-prevention?ts=markdown)
  
  * [Prisma Access](https://www.paloaltonetworks.cn/sase/access?ts=markdown)
  
  * [Prisma 浏览器](https://www.paloaltonetworks.cn/sase/prisma-browser?ts=markdown)
  
  * [Prisma SD-WAN](https://www.paloaltonetworks.cn/sase/sd-wan?ts=markdown)
  
  * [远程浏览器隔离](https://www.paloaltonetworks.cn/sase/remote-browser-isolation?ts=markdown)
  
  * [SaaS Security](https://www.paloaltonetworks.cn/sase/saas-security?ts=markdown)  
    [基于 AI 的安全运营平台](https://www.paloaltonetworks.cn/cortex?ts=markdown)
  
  * [Cloud Security](https://www.paloaltonetworks.cn/cortex/cloud?ts=markdown)
  
  * [Cortex Cloud](https://www.paloaltonetworks.cn/cortex/cloud?ts=markdown)
  
  * [应用安全](https://www.paloaltonetworks.cn/cortex/cloud/application-security?ts=markdown)
  
  * [云态势安全](https://www.paloaltonetworks.cn/cortex/cloud/cloud-posture-security?ts=markdown)
  
  * [云运行时安全](https://www.paloaltonetworks.cn/cortex/cloud/runtime-security?ts=markdown)
  
  * [Prisma Cloud](https://www.paloaltonetworks.cn/prisma/cloud?ts=markdown)
  
  * [Unit 42 托管检测和响应](https://www.paloaltonetworks.cn/cortex/managed-detection-and-response?ts=markdown)
  
  * [人工智能驱动的 SOC](https://www.paloaltonetworks.cn/cortex?ts=markdown)
  
  * [Cortex XSIAM](https://www.paloaltonetworks.cn/cortex/cortex-xsiam?ts=markdown)
  
  * [Cortex XDR](https://www.paloaltonetworks.cn/cortex/cortex-xdr?ts=markdown)
  
  * [Cortex AgentiX](https://www.paloaltonetworks.cn/cortex/agentix?ts=markdown)
  
  * [Cortex XSOAR](https://www.paloaltonetworks.cn/cortex/cortex-xsoar?ts=markdown)
  
  * [Cortex 风险暴露管理](https://www.paloaltonetworks.cn/cortex/exposure-management?ts=markdown)
  
  * [Cortex Xpanse](https://www.paloaltonetworks.cn/cortex/cortex-xpanse?ts=markdown)
  
  * [Cortex 高级电子邮件安全](https://www.paloaltonetworks.cn/cortex/advanced-email-security?ts=markdown)
  
  * [Unit 42 托管 XSIAM](https://www.paloaltonetworks.cn/cortex/managed-xsiam?ts=markdown)  
    [![](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberark/Seamless_IDs_small.jpg)  
    身份安全](https://www.paloaltonetworks.cn/identity-security?ts=markdown)

* 解决方案  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 解决方案  
  AI 安全
  
  * [安全的人工智能生态系统](https://www.paloaltonetworks.cn/prisma/prisma-ai-runtime-security?ts=markdown)
  * [安全使用 GenAI](https://www.paloaltonetworks.cn/sase/ai-access-security?ts=markdown)  
    网络安全
  * [云网络安全](https://www.paloaltonetworks.cn/network-security/software-firewalls?ts=markdown)
  * [数据中心安全](https://www.paloaltonetworks.cn/network-security/data-center?ts=markdown)
  * [DNS Security](https://www.paloaltonetworks.cn/network-security/advanced-dns-security?ts=markdown)
  * [入侵检测和防御](https://www.paloaltonetworks.cn/network-security/advanced-threat-prevention?ts=markdown)
  * [IoT Security](https://www.paloaltonetworks.cn/network-security/enterprise-device-security?ts=markdown)
  * [5G 安全](https://www.paloaltonetworks.cn/network-security/5g-security?ts=markdown)
  * [确保所有应用、用户和位置的安全](https://www.paloaltonetworks.cn/sase/secure-users-data-apps-devices?ts=markdown)
  * [确保分支机构转型的安全](https://www.paloaltonetworks.cn/sase/secure-branch-transformation?ts=markdown)
  * [确保任何设备上的工作安全](https://www.paloaltonetworks.cn/sase/secure-work-on-any-device?ts=markdown)
  * [VPN 替代](https://www.paloaltonetworks.cn/sase/vpn-replacement-for-secure-remote-access?ts=markdown)
  * [Web 和网络钓鱼安全](https://www.paloaltonetworks.cn/network-security/advanced-url-filtering?ts=markdown)  
    云安全
  * [应用安全态势管理 (ASPM)](https://www.paloaltonetworks.cn/cortex/cloud/application-security-posture-management?ts=markdown)
  * [软件供应链安全](https://www.paloaltonetworks.cn/cortex/cloud/software-supply-chain-security?ts=markdown)
  * [代码安全](https://www.paloaltonetworks.cn/cortex/cloud/code-security?ts=markdown)
  * [云安全态势管理 (CSPM)](https://www.paloaltonetworks.cn/cortex/cloud/cloud-security-posture-management?ts=markdown)
  * [云基础架构权限管理 (CIEM)](https://www.paloaltonetworks.cn/cortex/cloud/cloud-infrastructure-entitlement-management?ts=markdown)
  * [数据安全态势管理 (DSPM)](https://www.paloaltonetworks.cn/cortex/cloud/data-security-posture-management?ts=markdown)
  * [AI 安全态势管理 (AI-SPM)](https://www.paloaltonetworks.cn/cortex/cloud/ai-security-posture-management?ts=markdown)
  * [云检测与响应 (CDR)](https://www.paloaltonetworks.cn/cortex/cloud-detection-and-response?ts=markdown)
  * [云工作负载保护 (CWP)](https://www.paloaltonetworks.cn/cortex/cloud/cloud-workload-protection?ts=markdown)
  * [Web 应用及 API 安全 (WAAS)](https://www.paloaltonetworks.cn/cortex/cloud/web-app-api-security?ts=markdown)  
    安全运营
  * [云检测和响应](https://www.paloaltonetworks.cn/cortex/cloud-detection-and-response?ts=markdown)
  * [网络安全自动化](https://www.paloaltonetworks.cn/cortex/network-security-automation?ts=markdown)
  * [事件案例管理](https://www.paloaltonetworks.cn/cortex/incident-case-management?ts=markdown)
  * [SOC 自动化](https://www.paloaltonetworks.cn/cortex/security-operations-automation?ts=markdown)
  * [威胁情报管理](https://www.paloaltonetworks.cn/cortex/threat-intel-management?ts=markdown)
  * [托管的检测和响应](https://www.paloaltonetworks.cn/cortex/managed-detection-and-response?ts=markdown)
  * [攻击面管理](https://www.paloaltonetworks.cn/cortex/cortex-xpanse/attack-surface-management?ts=markdown)
  * [合规性管理](https://www.paloaltonetworks.cn/cortex/cortex-xpanse/compliance-management?ts=markdown)
  * [互联网运营管理](https://www.paloaltonetworks.cn/cortex/cortex-xpanse/internet-operations-management?ts=markdown)  
    端点安全
  * [端点防护](https://www.paloaltonetworks.cn/cortex/endpoint-protection?ts=markdown)
  * [扩展的检测和响应](https://www.paloaltonetworks.cn/cortex/detection-and-response?ts=markdown)
  * [勒索软件防护](https://www.paloaltonetworks.cn/cortex/ransomware-protection?ts=markdown)
  * [数字取证](https://www.paloaltonetworks.cn/cortex/digital-forensics?ts=markdown)  
    [行业](https://www.paloaltonetworks.cn/industry?ts=markdown)
  * [公共部门](https://www.paloaltonetworks.com/industry/public-sector)
  * [金融服务](https://www.paloaltonetworks.com/industry/financial-services)
  * [制造](https://www.paloaltonetworks.com/industry/manufacturing)
  * [医疗保健](https://www.paloaltonetworks.com/industry/healthcare)
  * [中小型企业解决方案](https://www.paloaltonetworks.com/industry/small-medium-business-portfolio)  
    [![](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberark/Seamless_IDs_small.jpg)  
    身份安全](https://www.paloaltonetworks.cn/identity-security?ts=markdown)

* 服务  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 服务  
  [威胁情报和事件响应服务](https://www.paloaltonetworks.cn/unit42?ts=markdown)
  
  * [评估](https://www.paloaltonetworks.cn/unit42/assess?ts=markdown)
  
  * [AI 安全评估](https://www.paloaltonetworks.cn/unit42/assess/ai-security-assessment?ts=markdown)
  
  * [攻击面评估](https://www.paloaltonetworks.cn/unit42/assess/attack-surface-assessment?ts=markdown)
  
  * [防泄露准备工作审核](https://www.paloaltonetworks.cn/unit42/assess/breach-readiness-review?ts=markdown)
  
  * [BEC 准备情况评估](https://www.paloaltonetworks.com/bec-readiness-assessment)
  
  * [云安全评估](https://www.paloaltonetworks.com/unit42/assess/cloud-security-assessment)
  
  * [入侵评估](https://www.paloaltonetworks.cn/unit42/assess/compromise-assessment?ts=markdown)
  
  * [网络风险评估](https://www.paloaltonetworks.cn/unit42/assess/cyber-risk-assessment?ts=markdown)
  
  * [并购网络尽职调查](https://www.paloaltonetworks.cn/unit42/assess/mergers-acquisitions-cyber-due-dilligence?ts=markdown)
  
  * [渗透测试](https://www.paloaltonetworks.cn/unit42/assess/penetration-testing?ts=markdown)
  
  * [紫队演习](https://www.paloaltonetworks.cn/unit42/assess/purple-teaming?ts=markdown)
  
  * [勒索软件就绪评估](https://www.paloaltonetworks.cn/unit42/assess/ransomware-readiness-assessment?ts=markdown)
  
  * [SOC 评估](https://www.paloaltonetworks.com/unit42/assess/soc-assessment)
  
  * [供应链风险评估](https://www.paloaltonetworks.cn/unit42/assess/supply-chain-risk-assessment?ts=markdown)
  
  * [桌面演习](https://www.paloaltonetworks.cn/unit42/assess/tabletop-exercise?ts=markdown)
  
  * [Unit 42 顾问人员](https://www.paloaltonetworks.cn/unit42/retainer?ts=markdown)
  
  * [响应](https://www.paloaltonetworks.cn/unit42/respond?ts=markdown)
  
  * [云事故响应](https://www.paloaltonetworks.cn/unit42/respond/cloud-incident-response?ts=markdown)
  
  * [数字取证](https://www.paloaltonetworks.cn/unit42/respond/digital-forensics?ts=markdown)
  
  * [事件响应](https://www.paloaltonetworks.cn/unit42/respond/incident-response?ts=markdown)
  
  * [托管检测与响应](https://www.paloaltonetworks.cn/unit42/respond/managed-detection-response?ts=markdown)
  
  * [托管威胁追踪](https://www.paloaltonetworks.cn/unit42/respond/managed-threat-hunting?ts=markdown)
  
  * [托管 XSIAM](https://www.paloaltonetworks.cn/cortex/managed-xsiam?ts=markdown)
  
  * [Unit 42 顾问人员](https://www.paloaltonetworks.cn/unit42/retainer?ts=markdown)
  
  * [转型](https://www.paloaltonetworks.cn/unit42/transform?ts=markdown)
  
  * [事故响应计划制定与审核](https://www.paloaltonetworks.cn/unit42/transform/incident-response-plan-development-review?ts=markdown)
  
  * [安全计划设计](https://www.paloaltonetworks.cn/unit42/transform/security-program-design?ts=markdown)
  
  * [虚拟 CISO](https://www.paloaltonetworks.cn/unit42/transform/vciso?ts=markdown)
  
  * [零信任咨询](https://www.paloaltonetworks.com/unit42/transform/zero-trust-advisory)  
    [全球客户服务](https://www.paloaltonetworks.cn/services?ts=markdown)
  
  * [教育与培训](https://www.paloaltonetworks.com/services/education)
  
  * [专业服务](https://www.paloaltonetworks.com/services/consulting)
  
  * [成功工具](https://www.paloaltonetworks.com/services/customer-success-tools)
  
  * [支持服务](https://www.paloaltonetworks.com/services/solution-assurance)
  
  * [客户成功](https://www.paloaltonetworks.com/services/customer-success)  
    [![](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/logo-unit-42.svg)  
    Unit 42 顾问人员
    为满足企业的需求而定制，您可以选择将顾问人员工时数分配给我们的任意产品，包括主动网络风险管理服务。了解如何一键呼叫世界一流的 Unit 42 事故响应团队。
    了解更多](https://www.paloaltonetworks.cn/unit42/retainer?ts=markdown)

* 合作伙伴  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 合作伙伴  
  NextWave 合作伙伴
  
  * [NextWave 合作伙伴社区](https://www.paloaltonetworks.com/partners)
  * [云服务提供商](https://www.paloaltonetworks.com/partners/nextwave-for-csp)
  * [全球系统集成商](https://www.paloaltonetworks.com/partners/nextwave-for-gsi)
  * [技术合作伙伴](https://www.paloaltonetworks.com/partners/technology-partners)
  * [服务提供商](https://www.paloaltonetworks.com/partners/service-providers)
  * [解决方案提供商](https://www.paloaltonetworks.com/partners/nextwave-solution-providers)
  * [托管安全服务提供商](https://www.paloaltonetworks.com/partners/managed-security-service-providers)  
    采取行动
  * [门户网站登录](https://www.paloaltonetworks.com/partners/nextwave-partner-portal)
  * [管理的服务计划](https://www.paloaltonetworks.com/partners/managed-security-services-provider-program)
  * [成为合作伙伴](https://paloaltonetworks.my.site.com/NextWavePartnerProgram/s/partnerregistration?type=becomepartner)
  * [请求访问](https://paloaltonetworks.my.site.com/NextWavePartnerProgram/s/partnerregistration?type=requestaccess)
  * [查找合作伙伴](https://paloaltonetworks.my.site.com/NextWavePartnerProgram/s/partnerlocator)  
    [CYBERFORCE
    CYBERFORCE 代表了因其安全专业知识而值得信赖的前 1% 的合作伙伴工程师。
    了解更多](https://www.paloaltonetworks.com/cyberforce)

* 公司  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 公司  
  Palo Alto Networks
  
  * [关于我们](https://www.paloaltonetworks.cn/about-us?ts=markdown)
  * [管理团队](https://www.paloaltonetworks.com/about-us/management)
  * [投资者关系](https://investors.paloaltonetworks.com/)
  * [地点](https://www.paloaltonetworks.com/about-us/locations)
  * [道德与合规性](https://www.paloaltonetworks.com/company/ethics-and-compliance)
  * [企业责任](https://www.paloaltonetworks.com/about-us/corporate-responsibility)
  * [军人和退伍军人](https://jobs.paloaltonetworks.com/military)  
    [为什么选择 Palo Alto Networks？](https://www.paloaltonetworks.cn/why-paloaltonetworks?ts=markdown)
  * [Precision AI 安全](https://www.paloaltonetworks.cn/precision-ai-security?ts=markdown)
  * [我们的平台方法](https://www.paloaltonetworks.cn/why-paloaltonetworks/platformization?ts=markdown)
  * [加速网络安全转型](https://www.paloaltonetworks.com/why-paloaltonetworks/nam-cxo-portfolio)
  * [获得的奖项与表彰](https://www.paloaltonetworks.com/about-us/awards)
  * [客户案例](https://www.paloaltonetworks.cn/customers?ts=markdown)
  * [全球认证](https://www.paloaltonetworks.com/legal-notices/trust-center/compliance)
  * [全方位信任计划](https://www.paloaltonetworks.com/resources/whitepapers/trust-360)  
    职业生涯
  * [概述](https://jobs.paloaltonetworks.com/)
  * [文化与福利](https://jobs.paloaltonetworks.com/culture)  
    [《新闻周刊》评选出的最受欢迎的工作场所
    善待员工的企业
    阅读更多](https://www.paloaltonetworks.com/company/press/2021/palo-alto-networks-secures-top-ranking-on-newsweek-s-most-loved-workplaces-list-for-2021)

* 更多内容  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 更多内容  
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3. [什么是数据流图？](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram?ts=markdown)  
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* [什么是安全架构？](https://www.paloaltonetworks.com/cyberpedia/what-is-security-architecture?ts=markdown)
  * [安全架构的主要目标](https://www.paloaltonetworks.cn/cyberpedia/what-is-security-architecture#key?ts=markdown)
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* 什么是数据流图？
  * [数据流图解释](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram#data?ts=markdown)
  * [数据流图中有哪些符号？](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram#what?ts=markdown)
  * [DFD 有哪些不同层次？](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram#different?ts=markdown)
  * [使用数据流图有什么好处？](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram#benefits?ts=markdown)
  * [数据流常见问题](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram#faqs?ts=markdown)
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# 什么是数据流图？

目录

* * [数据流图解释](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram#data?ts=markdown)
  * [数据流图中有哪些符号？](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram#what?ts=markdown)
  * [DFD 有哪些不同层次？](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram#different?ts=markdown)
  * [使用数据流图有什么好处？](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram#benefits?ts=markdown)
* [数据流常见问题](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram#faqs?ts=markdown)

1. 数据流图解释

* * [数据流图解释](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram#data?ts=markdown)
  * [数据流图中有哪些符号？](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram#what?ts=markdown)
  * [DFD 有哪些不同层次？](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram#different?ts=markdown)
  * [使用数据流图有什么好处？](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram#benefits?ts=markdown)
* [数据流常见问题](https://www.paloaltonetworks.cn/cyberpedia/data-flow-diagram#faqs?ts=markdown)

数据流图（DFD）是 数据 在信息系统中 [移动](https://www.paloaltonetworks.cn/cyberpedia/data-movement?ts=markdown) 的图形表示法，对其流程方面进行建模。它是一种用于系统分析和设计的强大工具，可以简洁明了地表示系统的组件、数据和交互。

## 数据流图解释

数据流图提供了一种可视化表达方式，映射了系统内的信息流，强调了流程、数据存储和外部实体。它可以帮助安全小组识别和分析数据路径，确保安全的数据处理和优化的流程。

数据流图使用标准化符号，描述组件之间的数据移动，说明输入如何转化为输出。通过发现数据处理中的潜在漏洞和低效之处，DFD 可促进在复杂系统中实施强化安全措施和简化工作流程。

### 云生态系统中的数据移动

在多云环境中，数据流图对于管理多个云服务提供商之间的数据移动至关重要。DFD 帮助专家可视化并跟踪云平台之间的数据流，确保无缝集成并遵守安全策略。通过映射多云环境中的数据流，从业人员可以识别潜在的暴露点或配置错误，从而在不同的云基础设施中设计有效的安全控制。此外，DFD 还有助于保持 [与数据保护法规的合规性](https://www.paloaltonetworks.cn/cyberpedia/data-compliance?ts=markdown)，因为它们能清晰地洞察多云生态系统中的数据处理实践和潜在风险。

## 数据流图中有哪些符号？

在 DFD 中，符号代表系统的各个组成部分及其相互作用。这些符号作为一种视觉语言，传达了系统内数据的结构和流程。

### 核心 DFD 符号

1. \*\*流程：\*\*流程以圆形、椭圆形或矩形表示，用于将输入数据流转化为输出数据流。
2. \*\*数据流：\*\*箭头表示数据在系统中移动的方向和路线。它表示系统将输入和输出何种信息。
3. \*\*数据存储：\*\*通常用两条水平线表示，它们表示数据存储库，如数据库或其他数据存储机制。
4. \*\*实体：\*\*实体以长方形或正方形表示，可以是外部行为体，也可以是与系统互动的系统单元。它们可以是数据源，也可以是数据目的地。

在 DFD 中统一使用这些符号可确保清晰度和统一性，帮助技术和非技术利益相关者理解系统的数据架构和交互。

## DFD 有哪些不同层次？

数据流图可以按不同的抽象层次构建。每一级都比上一级更详细地展示了系统的数据流和流程。

### 上下文图（0 级 DFD）

上下文图通常称为 0 级 DFD，代表了 DFD 的最高抽象级别。作为一个概览，它囊括了整个系统，并将其显示为一个统一的流程。该图清晰地勾勒出系统的边界，明确地划分出可以作为系统数据来源或目的地的外部实体。此外，它还阐明了这些外部实体与系统之间的主要数据流。不过，值得注意的是，数据存储（可能保存或检索信息的地方）通常不包括在这一层级的表示中。

### 第 1 级 DFD

在第 1 层数据流图中，上下文图中描述的单一总体流程被分解为重要的高级流程或子 流程。这一层阐明了系统的核心内部操作，清楚地展示了这些流程、相关外部实体和数据存储点之间的数据流。第 1 级 DFD 的一个显著特点是在可理解性和复杂性之间取得了和谐的平衡。它为利益相关者提供了系统主要功能的清晰视角，同时又避免了对细枝末节的深入探讨。这样既能确保观众了解更广泛的系统工作流程，又不会因为过多的细节而不知所措。

### 二级 DFD

在绘制第 2 层数据流图时，第 1 层 DFD 中划定的每个流程都要进一步分解为其基本子流程。这一级别的可视化效果更加复杂，能捕捉到详细的数据流及其导航的细微流程。此外，第二级 DFD 通常会深入研究数据存储领域，指出具体的数据存储，并阐明如何在这些存储库中访问和保留数据。因此，这种表示法能让人深入了解系统的内部运作，揭示数据在流程和存储点中移动时错综复杂的舞动过程。

### 第 3 级 DFD

在第 2 层数据流图之后，划分过程会进一步加强，每一层都会将流程进一步分解为更加具体和细化的操作。每提升一个级别，对系统数据流、流程和交互的洞察深度和精度都会相应提高。这种模块化细分并不是任意有限的。相反，这些层次的深度可以无限延伸，以满足透彻理解和表现系统运行所需的清晰度和细节。DFD 可以无限扩展，确保系统功能的每一个方面都得到细致的规划。

在实践中，决定为 DFD 创建多少层通常取决于系统的复杂性和分析的具体目标。其主要思路是先从大体概述开始，然后持续深入到更详细的表述，每一步都要清晰明了。

## 使用数据流图有什么好处？

使用数据流图有几个好处，尤其是在系统分析、设计和文档编制阶段。以下是采用 DFD 的一些重要优势：

### 视觉呈现

DFD 以清晰的图形表示系统的流程、数据流、数据存储和外部实体。这种可视化元素有助于技术和非技术利益相关者更轻松地掌握系统组件及其相互关系。

### 系统概述

上下文图（第 0 层 DFD）提供了整个系统的鸟瞰图，有助于从高层次了解系统边界、主要流程和外部交互。

### 模块化分解

DFD 可以对系统进行自上而下的模块化分解。从更高层次的 DFD 到更详细的 DFD，人们可以更深入地研究特定的系统方面，而不会被整个系统所淹没。

### 交流工具

DFD 是分析人员、设计人员、开发人员和其他利益相关者之间极好的沟通工具。他们确保每个人都能始终如一地理解系统的结构和功能。

### 确定冗余

通过绘制数据流图，DFD 可以帮助识别冗余或不必要的数据流程，从而简化系统设计。

### 增强型错误检测

DFD 可以帮助找出系统中的不一致、缺失元素或潜在瓶颈，然后在设计阶段加以解决。

### 文件

DFD 有助于编制系统文档，为未来的开发人员、分析人员和管理人员提供有关系统运行和数据流的宝贵见解。

### 促进系统改进

随着时间的推移，当系统需要发展或升级时，DFD 可以帮助确定需要改进、整合或修改的领域。

### 边界澄清

DFD 通过区分外部实体和内部流程，有助于明确系统的边界。这种区别对于确定系统开发项目的范围至关重要。

### 验证

DFD 可以与最终用户或利益相关者一起验证拟议的设计，确保设计符合系统的目标和要求。

DFD 可作为系统开发的路线图，提供清晰度，促进沟通，并确保系统设计的效率和效果。

## 数据流常见问题

### 什么是数据映射？

数据映射是在组织的系统和流程中创建数据关系和数据流的可视化表示的过程。它有助于组织了解数据是如何在不同系统、应用程序和第三方之间收集、存储、处理和共享的。由于需要识别潜在风险、保持数据准确性并有效应对数据主体的权利要求，因此数据映射对于遵守数据保护法规至关重要。

### 什么是云背景下的静态数据？

静态数据是指持久存储在云存储服务（如对象存储、块存储或数据库）中的任何数据。数据保持静态，不会被主动处理或通过网络传输。针对静态数据的[云安全措施](https://www.paloaltonetworks.cn/cyberpedia/what-is-a-cloud-security?ts=markdown) 包括加密、访问控制和定期漏洞评估，以保护敏感信息免遭未经授权的访问和潜在的安全威胁。

### 什么是动态数据？

移动数据包括云组件之间或本地部署与云基础设施之间主动传输的数据。它可能涉及云生态系统内存储系统、应用程序接口或数据流服务之间的数据传输。

确保运动中的数据安全至关重要，因为它更容易被截获和篡改。针对移动数据的先进安全措施包括利用加密协议、安全通信渠道和认证机制，在传输过程中保护 [敏感数据的](https://www.paloaltonetworks.cn/cyberpedia/sensitive-data?ts=markdown) 安全。

### 什么是使用中的数据？

云内使用中的数据是指基于云的应用程序和服务正在积极处理、访问或操作的数据。使用可能包括由大数据平台分析的数据、由无服务器功能处理的数据或用户通过网络应用程序访问的数据。

针对使用中数据的高级云安全实践包括实时监控、 [安全编码](https://www.paloaltonetworks.cn/cyberpedia/what-is-code-security?ts=markdown) 技术，以及实施访问控制和 [数据丢失预防](https://www.paloaltonetworks.com/cyberpedia/what-is-data-loss-prevention-dlp) 策略，以防止未经授权访问或篡改敏感信息。

### 流程图和 DFD 有什么区别？

DFD 与流程图的主要区别在于，DFD 直观地描述了系统内的数据流。相比之下，流程图说明了解决问题的步骤顺序。

### 如何在网络安全中使用 DFD？

数据流图直观地描述了一个实体系统（无论是你的还是你的供应商的）在业务运营过程中数据的位置和移动情况。最重要的一点是，数据在静止和传输过程中都能被识别。

### 什么是威胁建模中的数据流图？

在威胁建模中，DFD 通常用于确定潜在威胁的总体类别。这些类别通常以 STRIDE 威胁分类框架为基础，包括权限提升或分布式拒绝服务等威胁。
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[DSPM：你知道自己需要它吗？
了解数据安全的五种主要方法，以及每种数据安全方法的用例和应用。](https://www.paloaltonetworks.com/resources/datasheets/why-dspm)  
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