UUID5 Generator

Generate name-based UUIDs using SHA-1 hashing

UUID5

Click 'Generate' to create your first UUID5

About UUID5 Generator

UUID5 (Universally Unique Identifier version 5) generates deterministic identifiers using SHA-1 hashing with namespace and name inputs. This version creates reproducible UUIDs with improved cryptographic security compared to UUID3, making it ideal for secure content-based identification systems.

Generate UUID5 identifiers with SHA-1-based hashing that produces identical results for the same namespace and name combination. The tool supports custom namespace values and accepts any text input for name generation, ensuring reproducible and secure identifier creation with better collision resistance.

Perfect for secure content-based caching systems, data deduplication with security requirements, modern distributed systems, and applications requiring deterministic yet secure identifier generation. Ideal for cryptographic applications, secure URL shortening, and systems where predictable but secure UUIDs are essential.

UUID5 provides deterministic generation with enhanced security through SHA-1 hashing, enabling consistent identifier creation across systems while maintaining better cryptographic properties than UUID3. The reproducible nature combined with improved security makes it excellent for modern applications requiring predictable secure identifiers.

Key Features

  • Deterministic SHA-1-based generation
  • Enhanced cryptographic security
  • Namespace and name input support
  • Reproducible identical results
  • Better collision resistance than UUID3
  • Modern security standards compliance

UUID5 Frequently Asked Questions

How is UUID5 different from UUID3?

UUID5 uses SHA-1 hashing instead of MD5, providing better cryptographic security and collision resistance. While both are deterministic, UUID5 is recommended for applications where security is important.

When should I choose UUID5 over UUID3?

Choose UUID5 when you need deterministic identifiers with better security properties. Use UUID5 for modern applications, cryptographic use cases, or when working with sensitive data that requires stronger hash functions.

Is UUID5 secure enough for cryptographic applications?

UUID5 uses SHA-1, which is stronger than MD5 but not as secure as modern hash functions like SHA-256. It's suitable for identifier generation but consider stronger alternatives for high-security cryptographic applications.

Can I use the same namespace across UUID3 and UUID5?

Yes, you can use the same namespace UUID for both versions, but they will generate different identifiers for the same name input due to different hash algorithms (MD5 vs SHA-1).

What's the performance difference between UUID5 and UUID3?

UUID5 is slightly slower than UUID3 due to SHA-1 being more computationally intensive than MD5. However, the performance difference is minimal and the security benefits usually outweigh the small performance cost.

UUID5 Best Practices

  • Prefer UUID5 over UUID3 for new applications
  • Use meaningful namespaces for better organization
  • Document your hash algorithm choice for future reference
  • Consider input data sensitivity when choosing hash functions
  • Test deterministic behavior and security requirements

Related Tools

Other tools that might be useful for your workflow