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Message Digest

In the context of the [[Java Cryptography Architecture]] (JCA) and [[Java Cryptography Extension]] (JCE), a Message Digest is a cryptographic service that provides a secure, one-way hash function.^[600-developer-tools-security-java-security-jca-jce.md]

Overview

Message Digest algorithms are designed to take an arbitrary amount of input data (the message) and produce a fixed-size output, known as a hash value or digest.^[600-developer-tools-security-java-security-jca-jce.md] This process is one-way, meaning that it is computationally infeasible to recover the original message from the digest value alone.

Use Cases

The JCA/JCE framework supports Message Digest implementations for several security purposes, including:

  • Data Integrity: Verifying that data has not been altered.
  • Digital Signatures: Serving as the basis for creating Digital signatures.
  • Password Storage: Securely hashing credentials for verification.^[600-developer-tools-security-java-security-jca-jce.md]

Sources

  • 600-developer-tools-security-java-security-jca-jce.md