Use o Queryable Encryption com o Azure

{
  "_id": { "$oid": "<_id value>" },
  "firstName": "Jon",
  "lastName": "Doe",
  "patientId": {
    "$binary": {
      "base64": "<ciphertext>",
      "subType": "06"
    }
  },
  "address": "157 Electric Ave.",
  "patientRecord": {
    "ssn": {
      "$binary": {
        "base64": "<ciphertext>",
        "subType": "06"
      }
    },
    "billing": {
      "$binary": {
        "base64": "<ciphertext>",
        "subType": "06"
      }
    }
  },
  "medications": {
    "$binary": {
      "base64": "<ciphertext>",
      "subType": "06"
    }
  },
  "__safeContent__": [
    {
      "$binary": {
        "base64": "<ciphertext>",
        "subType": "00"
      }
    },
    {
      "$binary": {
        "base64": "<ciphertext>",
        "subType": "00"
      }
    }
  ]
}

Finding a document with regular (non-encrypted) client.
{
  _id: new ObjectId("628eabeb37590e84ea742665"),
  firstName: 'Jon',
  lastName: 'Doe',
  patientId: new Binary(Buffer.from("0798810acc0f4f46c9a76883cee80fca12102e9ddcbcdae46a821fa108a8155a850f2d0919475b6531ada68973d436a199b537a05a98a708c36d2bfec4979d59cbe66878865ce19e392d3e4789d309bdacc336e32efcc851806ae0a41b355288c10d01e39147e1c40d919c41913a0c9d2d3fad0d0d1d2873c4fc82c6c22f27b517df5f3131b331b96ed16a7c5cf89e09082a2d898c2dcd73da91d08760ba74a70077b2d0fdbbe1eea75655a19fcc397812325ad40b102cbd16b8d36b22e11e3f93404f24a8ff68cfdec3c22b0e787cb30078a5227b2a", "hex"), 6),
  address: '157 Electric Ave.',
  patientRecord: {
    ssn: new Binary(Buffer.from("07e8b69630c32f4a00a542af768f8abcf50223edd812ff20b0ecb046ee1a9f5a0eef8d85d99cd26076411129942752516ee605c55aadce73f3d44d81ea6ddbbb8134b108a9deb40d8cab9cb4f08ef210ab0c9d2ea4347f9d235b861baf29751e60abcf059eb5c120305bd5ac05a4e07ac8ccfa6d37283f4cdbfeb7a8accb65b71857d486b5cf55e354d6a95e287d9e2dd65f3f9d9c4c9d0bdb1f26c4bd549d7be77db81796be293e08b2223bac67b212423c4e06568578b5bd7a3c33cedc1b291bcda0b27e005144d344563711a489f24b8e9b65bbb721d3a0e9d9b227a0cec0cbad", "hex"), 6),
    billing: new Binary(Buffer.from("06808ae69d4caa49cf90bb688f386f097f03f870a7b8fcebb1980c9ee5488b1f0f68558fc2163adcd92d00ea5f349f56ed34e7b391f54c48ed2760b4bde73022fc818dc7486a4e046b92ce9c82e00333c7779d9d6bb476713a20632b593b7de54812662cfc4d174d05451d3f4195514e12edba", "hex"), 6)
  },
  medications: new Binary(Buffer.from("06665ec15d38254dc4aa16da856789d33404f27bfea53e0d2fa4deaff166989ab33f469644d89c29112d33b41dbe54ec2d89c43f3de52cdc5d454e8694046216f533614fa7b42b7c5406d6518f7ed8f9e3ce52fda6c8b2146d0f8cc51e21a3467183697e1735a9f60c18e173c1916101", "hex"), 6),
  __safeContent__: [
    new Binary(Buffer.from("3044b134ad0f7c8a90dab1e05bb8b296a8ede540796bd7403ab47693cdba1b26", "hex"), 0),
    new Binary(Buffer.from("a22ddf9a5657cdd56bef72febbba44371899e6486962a1c07d682082c4e65712", "hex"), 0)
  ]
}
Finding a document with encrypted client, searching on an encrypted field
{
  _id: new ObjectId("628eaca1dcf9b63e2f43162d"),
  firstName: 'Jon',
  lastName: 'Doe',
  patientId: 12345678,
  address: '157 Electric Ave.',
  patientRecord: {
    ssn: '987-65-4320',
    billing: { type: 'Visa', number: '4111111111111111' }
  },
  medications: [ 'Atorvastatin', 'Levothyroxine' ],
  __safeContent__: [
    new Binary(Buffer.from("fbdc6cfe3b4659693650bfc60baced27dcb42b793efe09da0ded54d60a9d5a1f", "hex"), 0),
    new Binary(Buffer.from("0f92ff92bf904a858ef6fd5b1e508187f523e791f51d8b64596461b38ebb1791", "hex"), 0)
  ]
}