Guides / CRC64

CRC64 (ECMA)

64-bit Checksum for Lower Collision Risk in Integrity Workflows

Important

CRC64 remains a checksum, not a secure hash. Use it for accidental error detection and compatibility, not for adversarial tamper protection.

What is CRC64-ECMA?

CRC64 is a cyclic redundancy check with a 64-bit output. In this app, the default variant is CRC64-ECMA with polynomial c96c5795d7870f42.

Why Use 64-bit CRC?

  • Larger checksum space than 32-bit variants
  • Lower accidental collision probability at scale
  • Useful in large datasets and backup pipelines

Key Properties

  • Output size: 64 bits (16 hex characters)
  • Default polynomial: ECMA
  • Custom polynomial: Supported as 16 hex characters

When to Use CRC64

  • Large-scale file verification
  • Data replication and archive consistency checks
  • Interoperability with systems expecting CRC64-ECMA

Try CRC64

Try CRC64 Calculator

Key Takeaways

  • CRC64 offers stronger accidental-collision resistance than 32-bit CRCs
  • Default variant here is CRC64-ECMA with 16 hex output characters
  • Use custom polynomials for interoperability with external systems
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