"author": {
      "@type": "Organization",
      "name": "Online UUID Generator"
    },
    "publisher": {
      "@type": "Organization",
      "name": "Online UUID Generator"
    },
    "mainEntityOfPage": {
      "@type": "WebPage",
      "@id": "https://online-uuid-generator.com/versions/v5/"
    }
  }

---

Online UUID Generator - Version 5

UUID Version 5 generates identifiers similarly to Version 3 but uses the SHA-1 hashing algorithm instead of MD5. It takes a namespace and a user-defined name as inputs, ensuring that the same inputs will always result in the same UUID.

Pros:

• Deterministic: Produces consistent UUIDs for the same name and namespace, making it ideal for generating repeatable unique IDs.
• Stronger Hashing: Uses SHA-1, which is more secure than MD5, reducing the likelihood of hash collisions.

Cons:

• Not Truly Random: UUID v5 is based on hashing, so it lacks randomness and is not suitable for security-sensitive applications requiring unpredictable IDs.
• Hashing Overhead: The SHA-1 algorithm is more computationally intensive than MD5, which may impact performance in some cases.

Best for: Scenarios where unique and consistent identifiers are needed from a specific namespace, such as generating IDs from URLs, usernames, or file paths.

When to Choose UUID v5

Perfect for:

• Deterministic ID generation with better security than v3
• Namespace-based resource identification
• Consistent IDs from URLs, usernames, or file paths
• Systems requiring reproducible unique identifiers

Consider alternatives if you need:

• Random IDs: Use UUID Version 4 for unpredictable identifiers
• Time-based sorting: Use UUID Version 7 for chronological ordering
• Legacy MD5 compatibility: Use UUID Version 3 if required

Related UUID Versions

Compare with other versions:

• UUID Version 1 - Time-based with MAC address
• UUID Version 3 - MD5 namespace-based, less secure
• UUID Version 4 - Random, most popular choice
• UUID Version 6 - Time-ordered sortable
• UUID Version 7 - Modern time-based with improved sorting

Popular implementation guides:

• JavaScript - Node.js APIs and web applications
• Python - Django models and data processing
• Java - Spring applications and enterprise systems
• C# - ASP.NET and Entity Framework
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