diff --git a/common/src/main/scala/net/psforever/packet/GamePacketOpcode.scala b/common/src/main/scala/net/psforever/packet/GamePacketOpcode.scala
index 522a20da..a8a7f4d3 100644
--- a/common/src/main/scala/net/psforever/packet/GamePacketOpcode.scala
+++ b/common/src/main/scala/net/psforever/packet/GamePacketOpcode.scala
@@ -491,11 +491,11 @@ object GamePacketOpcode extends Enumeration {
     case 0x90 => noDecoder(OutfitMemberEvent)
     case 0x91 => noDecoder(OutfitMemberUpdate)
     case 0x92 => game.PlanetsideStringAttributeMessage.decode
-    case 0x93 => noDecoder(DataChallengeMessage)
-    case 0x94 => noDecoder(DataChallengeMessageResp)
+    case 0x93 => game.DataChallengeMessage.decode
+    case 0x94 => game.DataChallengeMessageResp.decode
     case 0x95 => game.WeatherMessage.decode
-    case 0x96 => noDecoder(SimDataChallenge)
-    case 0x97 => noDecoder(SimDataChallengeResp)
+    case 0x96 => game.SimDataChallenge.decode
+    case 0x97 => game.SimDataChallengeResp.decode
     // 0x98
     case 0x98 => noDecoder(OutfitListEvent)
     case 0x99 => noDecoder(EmpireIncentivesMessage)
diff --git a/common/src/main/scala/net/psforever/packet/game/DataChallenge.scala b/common/src/main/scala/net/psforever/packet/game/DataChallenge.scala
new file mode 100644
index 00000000..7332fba5
--- /dev/null
+++ b/common/src/main/scala/net/psforever/packet/game/DataChallenge.scala
@@ -0,0 +1,9 @@
+// Copyright (c) 2020 PSForever
+package net.psforever.packet.game
+
+import net.psforever.packet.PacketHelpers
+import scodec.codecs.ulongL
+
+object DataChallenge {
+  val codec = PacketHelpers.encodedString :: ulongL(bits = 32)
+}
diff --git a/common/src/main/scala/net/psforever/packet/game/DataChallengeMessage.scala b/common/src/main/scala/net/psforever/packet/game/DataChallengeMessage.scala
new file mode 100644
index 00000000..9ba4decf
--- /dev/null
+++ b/common/src/main/scala/net/psforever/packet/game/DataChallengeMessage.scala
@@ -0,0 +1,23 @@
+// Copyright (c) 2020 PSForever
+package net.psforever.packet.game
+
+import net.psforever.packet.{GamePacketOpcode, Marshallable, PlanetSideGamePacket}
+import scodec.{Attempt, Codec}
+import scodec.bits.BitVector
+
+/**
+  * Our packet captures contain no examples of `DataChallengeMessage`.
+  * @param attribute na
+  * @param value na
+  */
+final case class DataChallengeMessage(attribute : String,
+                                      value : Long)
+  extends PlanetSideGamePacket {
+  type Packet = DataChallengeMessage
+  def opcode : GamePacketOpcode.Value = GamePacketOpcode.DataChallengeMessage
+  def encode : Attempt[BitVector] = DataChallengeMessage.encode(this)
+}
+
+object DataChallengeMessage extends Marshallable[DataChallengeMessage] {
+  implicit val codec : Codec[DataChallengeMessage] = DataChallenge.codec.as[DataChallengeMessage]
+}
diff --git a/common/src/main/scala/net/psforever/packet/game/DataChallengeMessageResp.scala b/common/src/main/scala/net/psforever/packet/game/DataChallengeMessageResp.scala
new file mode 100644
index 00000000..d4d1f80b
--- /dev/null
+++ b/common/src/main/scala/net/psforever/packet/game/DataChallengeMessageResp.scala
@@ -0,0 +1,23 @@
+// Copyright (c) 2020 PSForever
+package net.psforever.packet.game
+
+import net.psforever.packet.{GamePacketOpcode, Marshallable, PlanetSideGamePacket}
+import scodec.{Attempt, Codec}
+import scodec.bits.BitVector
+
+/**
+  * Our packet captures contain no examples of `DataChallengeMessageResp`.
+  * @param attribute na
+  * @param value na
+  */
+final case class DataChallengeMessageResp(attribute : String,
+                                          value : Long)
+  extends PlanetSideGamePacket {
+  type Packet = DataChallengeMessageResp
+  def opcode : GamePacketOpcode.Value = GamePacketOpcode.DataChallengeMessageResp
+  def encode : Attempt[BitVector] = DataChallengeMessageResp.encode(this)
+}
+
+object DataChallengeMessageResp extends Marshallable[DataChallengeMessageResp] {
+  implicit val codec : Codec[DataChallengeMessageResp] = DataChallenge.codec.as[DataChallengeMessageResp]
+}
diff --git a/common/src/main/scala/net/psforever/packet/game/SimDataChallenge.scala b/common/src/main/scala/net/psforever/packet/game/SimDataChallenge.scala
new file mode 100644
index 00000000..e0e8c51e
--- /dev/null
+++ b/common/src/main/scala/net/psforever/packet/game/SimDataChallenge.scala
@@ -0,0 +1,36 @@
+// Copyright (c) 2020 PSForever
+package net.psforever.packet.game
+
+import net.psforever.packet.{GamePacketOpcode, Marshallable, PlanetSideGamePacket}
+import scodec.{Attempt, Codec}
+import scodec.bits.BitVector
+import scodec.codecs._
+
+/**
+  * na
+  * @param unk1 na
+  * @param unk2 na
+  * @param unk3 na
+  * @param unk4 na
+  * @param unk5 na
+  */
+final case class SimDataChallenge(unk1 : List[Long],
+                                  unk2 : Boolean,
+                                  unk3 : Int,
+                                  unk4 : Long,
+                                  unk5 : Boolean)
+  extends PlanetSideGamePacket {
+  type Packet = SimDataChallenge
+  def opcode : GamePacketOpcode.Value = GamePacketOpcode.SimDataChallenge
+  def encode : Attempt[BitVector] = SimDataChallenge.encode(this)
+}
+
+object SimDataChallenge extends Marshallable[SimDataChallenge] {
+  implicit val codec : Codec[SimDataChallenge] = (
+    ("unk1" | listOfN(uint16L, ulongL(bits = 32))) ::
+      ("unk2" | bool) ::
+      ("unk3" | uint8) ::
+      ("unk4" | ulongL(bits = 32)) ::
+      ("unk5" | bool)
+  ).as[SimDataChallenge]
+}
diff --git a/common/src/main/scala/net/psforever/packet/game/SimDataChallengeResp.scala b/common/src/main/scala/net/psforever/packet/game/SimDataChallengeResp.scala
new file mode 100644
index 00000000..14b64b9a
--- /dev/null
+++ b/common/src/main/scala/net/psforever/packet/game/SimDataChallengeResp.scala
@@ -0,0 +1,30 @@
+// Copyright (c) 2020 PSForever
+package net.psforever.packet.game
+
+import net.psforever.packet.{GamePacketOpcode, Marshallable, PlanetSideGamePacket}
+import scodec.{Attempt, Codec}
+import scodec.bits.BitVector
+import scodec.codecs._
+
+/**
+  * na
+  * @param unk1 na
+  * @param unk2 na
+  * @param unk3 na
+  */
+final case class SimDataChallengeResp(unk1 : List[Long],
+                                      unk2 : List[Long],
+                                      unk3 : Boolean)
+  extends PlanetSideGamePacket {
+  type Packet = SimDataChallengeResp
+  def opcode : GamePacketOpcode.Value = GamePacketOpcode.SimDataChallengeResp
+  def encode : Attempt[BitVector] = SimDataChallengeResp.encode(this)
+}
+
+object SimDataChallengeResp extends Marshallable[SimDataChallengeResp] {
+  implicit val codec : Codec[SimDataChallengeResp] = (
+    ("unk1" | listOfN(uint16L, ulongL(bits = 32))) ::
+      ("unk2" | listOfN(uint16L, ulongL(bits = 32))) ::
+      ("unk3" | bool)
+    ).as[SimDataChallengeResp]
+}
diff --git a/common/src/test/scala/game/DataChallengeMessageRespTest.scala b/common/src/test/scala/game/DataChallengeMessageRespTest.scala
new file mode 100644
index 00000000..51e002df
--- /dev/null
+++ b/common/src/test/scala/game/DataChallengeMessageRespTest.scala
@@ -0,0 +1,28 @@
+// Copyright (c) 2020 PSForever
+package game
+
+import org.specs2.mutable._
+import net.psforever.packet._
+import net.psforever.packet.game._
+import scodec.bits._
+
+class DataChallengeMessageRespTest extends Specification {
+  val string = hex"948673616d706c6501000000"
+
+  "decode" in {
+    PacketCoding.DecodePacket(string).require match {
+      case DataChallengeMessageResp(attribute, value) =>
+        attribute mustEqual "sample"
+        value mustEqual 1L
+      case _ =>
+        ko
+    }
+  }
+
+  "encode" in {
+    val msg = DataChallengeMessageResp("sample", 1L)
+    val pkt = PacketCoding.EncodePacket(msg).require.toByteVector
+
+    pkt mustEqual string
+  }
+}
diff --git a/common/src/test/scala/game/DataChallengeMessageTest.scala b/common/src/test/scala/game/DataChallengeMessageTest.scala
new file mode 100644
index 00000000..16fb41d4
--- /dev/null
+++ b/common/src/test/scala/game/DataChallengeMessageTest.scala
@@ -0,0 +1,28 @@
+// Copyright (c) 2020 PSForever
+package game
+
+import org.specs2.mutable._
+import net.psforever.packet._
+import net.psforever.packet.game._
+import scodec.bits._
+
+class DataChallengeMessageTest extends Specification {
+  val string = hex"938673616d706c6501000000"
+
+  "decode" in {
+    PacketCoding.DecodePacket(string).require match {
+      case DataChallengeMessage(attribute, value) =>
+        attribute mustEqual "sample"
+        value mustEqual 1L
+      case _ =>
+        ko
+    }
+  }
+
+  "encode" in {
+    val msg = DataChallengeMessage("sample", 1L)
+    val pkt = PacketCoding.EncodePacket(msg).require.toByteVector
+
+    pkt mustEqual string
+  }
+}
diff --git a/common/src/test/scala/game/SimDataChallengeRespTest.scala b/common/src/test/scala/game/SimDataChallengeRespTest.scala
new file mode 100644
index 00000000..dc2d033c
--- /dev/null
+++ b/common/src/test/scala/game/SimDataChallengeRespTest.scala
@@ -0,0 +1,33 @@
+// Copyright (c) 2020 PSForever
+package game
+
+import org.specs2.mutable._
+import net.psforever.packet._
+import net.psforever.packet.game._
+import scodec.bits._
+
+class SimDataChallengeRespTest extends Specification {
+  val string = hex"97050067030000e9030000e1040000000100006502000005003b3388faa52df48fb27971e7c3a9d0c109d5b03f00"
+
+  "decode" in {
+    PacketCoding.DecodePacket(string).require match {
+      case SimDataChallengeResp(u1, u2, u3) =>
+        u1 mustEqual List(871L, 1001L, 1249L, 256L, 613L)
+        u2 mustEqual List(4203230011L, 2415144357L, 3882973618L, 3251677635L, 1068553481L)
+        u3 mustEqual false
+      case _ =>
+        ko
+    }
+  }
+
+  "encode" in {
+    val msg = SimDataChallengeResp(
+      List(871L, 1001L, 1249L, 256L, 613L),
+      List(4203230011L, 2415144357L, 3882973618L, 3251677635L, 1068553481L),
+      false
+    )
+    val pkt = PacketCoding.EncodePacket(msg).require.toByteVector
+
+    pkt mustEqual string
+  }
+}
diff --git a/common/src/test/scala/game/SimDataChallengeTest.scala b/common/src/test/scala/game/SimDataChallengeTest.scala
new file mode 100644
index 00000000..90b068e4
--- /dev/null
+++ b/common/src/test/scala/game/SimDataChallengeTest.scala
@@ -0,0 +1,31 @@
+// Copyright (c) 2020 PSForever
+package game
+
+import org.specs2.mutable._
+import net.psforever.packet._
+import net.psforever.packet.game._
+import scodec.bits._
+
+class SimDataChallengeTest extends Specification {
+  val string = hex"96050067030000e9030000e10400000001000065020000808000000000"
+
+  "decode" in {
+    PacketCoding.DecodePacket(string).require match {
+      case SimDataChallenge(u1, u2, u3, u4, u5) =>
+        u1 mustEqual List(871L, 1001L, 1249L, 256L, 613L)
+        u2 mustEqual true
+        u3 mustEqual 1
+        u4 mustEqual 0L
+        u5 mustEqual false
+      case _ =>
+        ko
+    }
+  }
+
+  "encode" in {
+    val msg = SimDataChallenge(List(871L, 1001L, 1249L, 256L, 613L), true, 1, 0, false)
+    val pkt = PacketCoding.EncodePacket(msg).require.toByteVector
+
+    pkt mustEqual string
+  }
+}