Simple File Verification (SFV) format

Simple file verification is a checksum format using the Cyclic Redundancy Check (CRC32) algorithm to verify the integrity of files. CRC32, and thus also SFV, is not an ideal format for securely verifying data integrity, since the CRC32 format is vulnerable to intentional modification that cannot be detected. Other formats, such as MD5, are better suited for ensuring the authenticity of files.

It is very simple to explain why SFV is not so good to use, just compare following numbers:

CRC32 has an output of 32 bit number. This means 2 ^ 32 = 4294967296 unique values, when MD5 has 128 bit number: 2 ^ 128 = 3.4028236692093846346337460743177e+38.

As you can see the difference is huge! So there's no reason to hesitate, experience the MD5 checksum utility for yourself and take control of your data.

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