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MAC # signature or cryptographic checksum
>>> the message has not been changed
| MAC | https://www.youtube.com/watch?v=DiLPn_ldAAQ&ab_channel=IntroductiontoCryptographybyChristofPaar |
|---|---|
| symmetrical key ( how to exchange/distribute/change keys ) | |
| 1 | Arbitrary Input length |
| 2 | Fix output length |
| 3 | message authentication: because of the secure channel use - build with private/public Key |
| 4 | Integrity ( change inline ) |
| 5 | None-repudiation is not given ( the Rx can create from the message the signature with the symmetrical key) |
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