A hash is a fixed-sized string created by applying a hash function to data. A hash can be used in many different applications for various purposes but are often used to encrypt SSH keys or create unique numerical values that can act as identifiers for data resources.

For example, hashes are used to reference code changes, called commits, in GitHub and other code repository services. DigitalOcean’s Container Registry also uses hashes to create digests for each version of an image stored in a registry. An example hash created with the SHA algorithm looks like this: 3479436528b6961f29e22576d76787b6e5262761

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