How deeply does Go in Action, Second Edition cover checksum?

Explains checksum roles, paired records, verification sources, and version-control practice without detailing digest algorithms.

Checksum

As explained in Go in Action, Second Edition

A cryptographic checksum is a digest computed from data that can reveal whether the data has changed.

A cryptographic checksum is a digest computed from dependency data to reveal tampering and preserve reproducible builds. Go records these checksums in go.sum alongside go.mod. section 11.1

Go uses checksums to:

Verify both a module’s source code and its go.mod file. section 11.1
Reject modified published versions when their checksums no longer match. section 11.1
Provide defense in depth through go.sum and sum.golang.org. section 11.1

A go.sum entry

A dependency can have separate checksum records for its source archive and go.mod file, such as github.com/gorilla/mux v1.8.0 h1:… and github.com/gorilla/mux v1.8.0/go.mod h1:…. section 11.1

github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=

Inspect concrete go.sum records for a dependency and its go.mod file. section 11.1

How Go in Action, Second Edition covers it

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Also explained in

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API Design PatternsA checksum value is derived data appended to an identifier to help verify that the identifier was received or entered correctly.
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Acing the CCNA Exam: Volume 2 Advanced Networking and SecurityA checksum is a small value derived mathematically from data to allow detection of changes to that data.
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Troubleshooting Java, Second EditionA checksum is a computed value derived from data for detecting changes or transmission and storage errors.
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Rust in Action: Systems programming concepts and techniquesA checksum is a value computed from data and stored or transmitted with it so later recomputation can detect changes or corruption.

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Related concepts

hash valuekind of · A hash value is a deterministic, typically fixed-size value produced by applying a hash function to input data, often for lookup, comparison, identification, or integrity checking.
frame check sequenceused by · A frame check sequence is an error-detection field in a frame that enables a receiver to detect corruption during transmission.
unique identifierused by · A unique identifier is a value or name that distinguishes an entity or record from others within a defined scope or namespace.

This explainer was generated by Manning's knowledge graph from the text of Go in Action, Second Edition. The section links point to the parts of the book it draws on.