Prevents inspection of data on the wire, MiTM attacks. In SMB 3.1.1 encryption performance is even better than signing! Insecure guest auth blocking (SMB 3.0+ on Windows 10+). Protects against MiTM attacks. Better message signing (SMB 2.02+). HMAC SHA-256 replaces MD5 as the hashing algorithm in SMB 2.02, SMB 2.1 and AES-CMAC replaces that in ... More @Wikipedia
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