Research Article
[Retracted] MEMS Sensors in Tennis Teaching and Training under the Background of Big Data Intelligent Communication
| Horizontal mode | Safe mode | Safe mode level |
| Horizontal mode 0 | Safe mode 0 | Connection not allowed | Horizontal mode 1 | Safe mode 1 | No safety requirements | Horizontal mode 1 | Safe mode 2 | Signature or encryption, no MTTM protection | Horizontal mode 2 | Safe mode 1 | Need to encrypt the link, no MITM protection | Horizontal mode 2 | Safe mode 2 | MITM protected signature or encrypted link | Horizontal mode 3 | Safe mode 1 | Encrypted connection and MITM protection |
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