Calculate 64-bit CRC checksums with ECMA-182 polynomial for large files and storage systems.
About
CRC64 computes a 64-bit cyclic redundancy check using the ECMA-182 polynomial, providing enhanced error detection with a larger checksum space.
Specifications
Output Size64 bits
StandardECMA-182
Standard Year1993
Use Cases
—Large file transmission integrity
—Storage systems error detection
—Network packet verification
Security Notice
CRC64 is not cryptographically secure and should not be used for security or authentication purposes.
Frequently Asked Questions
CRC64 is a 64-bit cyclic redundancy check using the ECMA-182 polynomial (0x42F0E1EBA9EA3693). It provides significantly better error detection than CRC32 due to the larger checksum space, with collision probability of 1 in 2^64 versus 1 in 2^32 for CRC32. It's used for large file integrity, storage systems, and network protocols handling large data volumes.
Use CRC64 when: (1) Processing files larger than a few gigabytes (where 32-bit collision probability becomes significant), (2) Designing storage systems requiring high data integrity, (3) Implementing distributed systems with billions of objects, (4) Network protocols handling large transfers. CRC32 is sufficient for smaller files and basic error detection.
CRC64 provides excellent error detection for accidental corruption (bit flips, transmission errors) but zero protection against intentional tampering. An attacker can easily forge CRC64 checksums. Use CRC64 for error detection in trusted environments; use SHA-256 or BLAKE3 when you need tamper resistance or cryptographic security.