hash digest - Glossary | CSRC (2024)

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Hash digest - Glossary | CSRC? ›

A method of calculating a relatively unique output (called a hash digest) for an input of nearly any size (a file, text, image, etc.) by applying a cryptographic hash function to the input data.

A hash digest is a random output of fixed length generated by applying a secure hash function to a message of arbitrary length. It is used in blockchain technology to ensure security and integrity of data by producing a unique output for each input.

The digest is the output of the hash function. For example, sha256 has a digest of 256 bits, i.e. its digest has a length of 32 bytes. That's it really. The basic difference between a hash function and digest is that digest is the value obtained from a hash function.

A message digest is a numeric representation of a message computed by a cryptographic hash algorithm or a function. Regardless of the size of the message, the message digest produces a numeric representation of a fixed size when hashed. It is used to ensure and verify that a message is genuine.

A hash function accepts as input an arbitrary length string of bits and produces as output a fixed size string of bits known as the message digest. The goal of a cryptographic hash function is to perform the mapping as if the function were a random function.

Whereas most checksum algorithms are invert- ible and generate a 2-byte or 4-byte checksum, most digest algorithms generate a 16-byte (128- bit) digest, and are non-invertible.

A message digest is a cryptographic hash function output that provides a fixed-size string of characters from an input of any size. It serves as a digital fingerprint of the input data, ensuring data integrity and security.

File sharing programs, such as peer-to-peer (P2P), utilize message digests to warn users when downloading identical files. It can also pinpoint the origin of duplicate downloads. Besides MD5, SHA and CRC32 are other message digest algorithms. Message digests are encrypted with private keys creating a digital signature.

In cryptography, SHA-1 (Secure Hash Algorithm 1) is a hash function which takes an input and produces a 160-bit (20-byte) hash value known as a message digest – typically rendered as 40 hexadecimal digits.

For example, if Alice wants to send a message to Bob, first of all, the message will be sent to the hash function, which will create the message digest. The created message digest is a unique string that cannot be converted back into a message.

How is digest created? ›

The Digest/Hash function produces a digital summary of information called a message digest. Message digests provide a digital identifier for a digital document. The message digest produced by the Digest/Hash function is Base64 encoded.

Data digestion can be defined as the process of adding information coming from other sources (environmental, context, construction data, etc) to the data retrieved from the instruments to help understand it.

Since encryption is two-way, the data can be decrypted so it is readable again. Hashing, on the other hand, is one-way, meaning the plaintext is scrambled into a unique digest, through the use of a salt, that cannot be decrypted.

In cryptography, we pass an input text from any algorithm that generates some secured text. Now that algorithm is called a hash function and that secured text is called a digest. From here we can conclude that in cryptography we pass original text from the hash function to generate a digest.

The SHA-256 mechanism, denoted CKM_SHA256, is a mechanism for message digesting, following the Secure Hash Algorithm with a 256-bit message digest defined in FIPS PUB 180-2. It does not have a parameter. Constraints on the length of input and output data are summarized in the following table.

digest_size is simply the length or size (in bytes) of the data once it is hashed or "digested" by the hash_object. For for example from the code below getting the digest of the string 'Hello World' via a SHA256 hash object returns a digest_size of 32 bytes (or 256 bits).

Data digestion can be defined as the process of adding information coming from other sources (environmental, context, construction data, etc) to the data retrieved from the instruments to help understand it.

A file digest is a short digital summary of a file. The digest is used to ensure that a known file is being evaluated.

The Digest/Hash function produces a digital summary of information called a message digest. Message digests provide a digital identifier for a digital document. The message digest produced by the Digest/Hash function is Base64 encoded.

Case digests are multi-volume sets arranged in alphabetical order by subject and are used to find case law on very specific legal topics. Digests can also be used for locating cases that have defined specific legal terms or to find the citation to an opinion when only the names of the parties are known.