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Downloading Azure Blob Files to Local System Using Azure Entra ID (Managed Identity / Service Principal)

4 min readNov 1, 2025

In earlier blogs, we discussed downloading files from Azure Blob Storage using connection strings or SAS tokens. But as organizations move toward zero-trust and keyless architectures, Azure Entra ID (formerly Azure AD) has become the preferred way to authenticate securely — without embedding secrets.

In this post, we’ll go step-by-step to understand:

  • Why Entra ID authentication is safer
  • How it differs from connection strings
  • How to configure your environment
  • And finally, a complete C# program to download blobs securely into your local folder
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1. Why Use Azure Entra ID Authentication

Traditionally, developers accessed Blob Storage using:

  • Connection strings with the Account Key
  • SAS Tokens with limited time and permissions

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DotNet Full Stack Dev
DotNet Full Stack Dev

Written by DotNet Full Stack Dev

Join me to master .NET Full Stack Development & boost your skills by 1% daily with insights, and techniques https://dotnetfullstackdev.gumroad.com/