How deeply does ASP.NET Core in Action, 3e cover hash function?

Explains content-based cache busting and password-storage guidance, but stops short of hash algorithm internals.

Hash function

As explained in ASP.NET Core in Action, 3e

A hash is a deterministic compact value computed from data such that modifying the data normally changes the resulting value.

A hash function deterministically converts data into a compact value. Changing the data normally changes the value, making hashes useful for detecting modified files and protecting stored passwords. section 18.4 section 29.4.4

Common applications include:

Cache busting: ASP.NET Core can hash a referenced file and append the result as a query string. Unchanged files keep the same URL and browser cache; modified files receive a new URL. section 18.4
Password protection: store cryptographic hashes rather than passwords directly, using an expensive algorithm such as BCrypt or PBKDF2. section 29.4.4

Versioning a script automatically

Add asp-append-version="true" to a script, image, or link element. The generated URL includes a content-based query string such as ?v=EWaMeWsJBYWmL2g_KkgXZQ5nPe; editing the file changes that value and prompts browsers to request the updated resource. section 18.4

<script src="~/js/site.js" asp-append-version="true"></script>

Shows the concise Tag Helper syntax for adding a content hash to a script URL. section 18.4

How ASP.NET Core in Action, 3e covers it

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Also explained in

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Real-World CryptographyA hash function maps input data to a fixed-size output and may provide cryptographic properties such as one-wayness and collision resistance.
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Hacking CryptographyA function that maps input data to a fixed-size digest, typically designed so that recovering or finding inputs with specified relationships is computationally infeasible.
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Grokking Algorithms, Second EditionA hash function is a deterministic function that maps a key to a value used to determine its storage location in a hash table.
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Grokking Data StructuresA hash function is a function that maps input data to a bounded hash value used to compute or organize lookup keys.
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Spring Security in Action, Second EditionA hashing algorithm deterministically transforms input data into an output from which the original input is intended to be impractical to recover.
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Troubleshooting Java, Second EditionHashing is the transformation of data into a fixed-size digest that can be compared to detect content differences without transmitting the original data.
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Grokking Relational Database DesignA hash function is a function that maps variable-length input data to a fixed-length output value.
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The Joy of JavaScriptThe process of computing a fixed-size digest or hash value from input data using a hash function.
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First-Party Data ActivationThe transformation of input data into a fixed-length value designed for integrity checking, lookup, or comparison without retaining the original representation.
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Effective Data AnalysisA hash algorithm is a computational procedure that deterministically maps data to a fixed-size hash code.
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Grokking Web Application SecurityA hashing algorithm deterministically maps input data to a fixed-size hash value while being designed to make different inputs produce different values with high probability.
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Python How-ToHashing is the computation of a compact hash value from input data using a hash function.
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Akka in Action, Second EditionA hashing algorithm is an algorithm that deterministically maps input data to hash values.
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Acing the CCNA Exam: Volume 2 Advanced Networking and SecurityA hashing algorithm transforms input data into a fixed-size digest that can support password protection and integrity verification.
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Python Workout, Second EditionA hash function is a function that maps a hashable Python object to an integer hash value used by hash-based data structures.

Compare how 16 books explain hash function →

Related concepts

hash valueproduces · 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.
SHA-256includes · SHA-256 is a standardized cryptographic hash function in the SHA-2 family that maps arbitrary input data to a fixed-length 256-bit digest.
cryptographic hashproduces · A cryptographic hash is a fixed-length digest computed from input data by a deterministic function designed to resist preimage, second-preimage, and collision attacks.
bloom filterused by · A Bloom filter is a space-efficient probabilistic data structure for testing set membership that permits false positives but not false negatives.
SHA-2includes · SHA-2 is a standardized family of cryptographic hash algorithms that produces fixed-length digests, including SHA-224, SHA-256, SHA-384, and SHA-512.
HMACused by · HMAC is a keyed message authentication code constructed from a cryptographic hash function and a secret key to authenticate data and verify its integrity.

This explainer was generated by Manning's knowledge graph from the text of ASP.NET Core in Action, 3e. The section links point to the parts of the book it draws on.