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Message authentication code - Wikipedia, the free encyclopedia (340 words) |
 | A cryptographic message authentication code (MAC) is a short piece of information used to authenticate a message. |
| A MAC algorithm accepts as input a secret key and an arbitrary-length message to be authenticated, and outputs a MAC (sometimes known as a tag). |
| The MAC value protects both a message's integrity as well as its authenticity, by allowing verifiers (who also possess the secret key) to detect any changes to the message content. |
| US CODE--TITLE 28--APPENDIX (4106 words) |
| This requirement of showing authenticity or identity fails in the category of relevancy dependent upon fulfillment of a condition of fact and is governed by the procedure set forth in Rule 104(b). |
| The treatment of authentication and identification draws largely upon the experience embodied in the common law and in statutes to furnish illustrative applications of the general principle set forth in subdivision (a). |
| Illustrative are the provisions for authentication of official records in Civil Procedure Rule 44 and Criminal Procedure Rule 27, for authentication of records of proceedings by court reporters in 28 U.S.C. § 753(b) and Civil Procedure Rule 80(c), and for authentication of depositions in Civil Procedure Rule 30(f). |
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