A form of Encryption.

When sending a message, the sender uses a message-digest algorithm to generate a shorter version of the message that can be encrypted, called a message digest. Next the sender uses their private key to encrypt the message digest. The sender transmits the message and the encrypted message digest to the recipient.

Upon receiving the message, the recipient decrypts the message digest. The recipient uses the same hash function on the message to generate another message digest, and compares the decrypted message digest against the newly generated one.

  • If the message digests are identical, the recipient knows that the message was indeed sent by the person claiming to be the sender and that the message was not modified during transmission.
  • If the message digests differ, the recipient knows that either the message was sent by someone else claiming to be the sender or that the message was modified or damaged during transmission.

The encrypted message digest serves as a digital signature for the message. The signature verifies the identity of the sender and the contents of the message.

Also, DIgest is a secure one way hash that can't be decrypted, for web sites and TCP/IP traffic. Both sides use the algorithm to encrypt the name and password and compare the result. Banks and Online Brokerage sites use this.

Di*gest" (?), v. t. [imp. & p. p. Digested; p. pr. & vb. n. Digesting.] [L. digestus, p. p. of digerere to separate, arrange, dissolve, digest; di- = dis- + gerere to bear, carry, wear. See Jest.]


To distribute or arrange methodically; to work over and classify; to reduce to portions for ready use or application; as, to digest the laws, etc.

Joining them together and digesting them into order. Blair.

We have cause to be glad that matters are so well digested. Shak.

2. Physiol.

To separate (the food) in its passage through the alimentary canal into the nutritive and nonnutritive elements; to prepare, by the action of the digestive juices, for conversion into blood; to convert into chyme.


To think over and arrange methodically in the mind; to reduce to a plan or method; to receive in the mind and consider carefully; to get an understanding of; to comprehend.

Feelingly digest the words you speak in prayer. Sir H. Sidney.

How shall this bosom multiplied digest The senate's courtesy? Shak.


To appropriate for strengthening and comfort.

Grant that we may in such wise hear them [the Scriptures], read, mark, learn, and inwardly digest them. Book of Common Prayer.


Hence: To bear comfortably or patiently; to be reconciled to; to brook.

I never can digest the loss of most of Origin's works. Coleridge.

6. Chem.

To soften by heat and moisture; to expose to a gentle heat in a boiler or matrass, as a preparation for chemical operations.

7. Med.

To dispose to suppurate, or generate healthy pus, as an ulcer or wound.


To ripen; to mature.


Well-digested fruits. Jer. Taylor.


To quiet or abate, as anger or grief.


© Webster 1913.

Di*gest" (?), v. i.


To undergo digestion; as, food digests well or ill.

2. Med.

To suppurate; to generate pus, as an ulcer.


© Webster 1913.

Di"gest (?), n. [L. digestum, pl. digesta, neut., fr. digestus, p. p.: cf. F. digeste. See Digest, v. t.]

That which is digested; especially, that which is worked over, classified, and arranged under proper heads or titles

; esp. Law,

a compilation of statutes or decisions analytically arranged. The term is applied in a general sense to the Pandects of Justinian (see Pandect), but is also specially given by authors to compilations of laws on particular topics; a summary of laws; as, Comyn's Digest; the United States Digest.

A complete digest of Hindu and Mahommedan laws after the model of Justinian's celebrated Pandects. Sir W. Jones.

They made a sort of institute and digest of anarchy, called the Rights of Man. Burke.


© Webster 1913.

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