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The subfields of the Authenticator field of the Server NTP Response message include the following.
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Key Identifier |
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Crypto-Checksum (16 bytes) |
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Key Identifier (4 bytes): A 32-bit unsigned integer in little-endian byte order (least significant byte first). It identifies the cryptographic key used to generate the crypto-checksum, as specified in section 2.2.1. For more information, see section 3.1.5.<4>
Crypto-Checksum (16 bytes): A 128-bit crypto-checksum computed by an encryption procedure. For more information, see section 3.2.5.