diff --git a/src/RabbitMQ.Next/Transport/Methods/Connection/SecureMethod.cs b/src/RabbitMQ.Next/Transport/Methods/Connection/SecureMethod.cs
new file mode 100644
index 0000000..a5e8cf4
--- /dev/null
+++ b/src/RabbitMQ.Next/Transport/Methods/Connection/SecureMethod.cs
@@ -0,0 +1,16 @@
+using System;
+using RabbitMQ.Next.Methods;
+
+namespace RabbitMQ.Next.Transport.Methods.Connection;
+
+public readonly struct SecureMethod : IIncomingMethod
+{
+    public SecureMethod(ReadOnlyMemory<byte> challenge)
+    {
+        this.Challenge = challenge;
+    }
+    
+    public MethodId MethodId => MethodId.ConnectionSecure;
+    
+    public ReadOnlyMemory<byte> Challenge { get; }
+}
\ No newline at end of file
diff --git a/src/RabbitMQ.Next/Transport/Methods/Connection/SecureMethodParser.cs b/src/RabbitMQ.Next/Transport/Methods/Connection/SecureMethodParser.cs
new file mode 100644
index 0000000..ee86782
--- /dev/null
+++ b/src/RabbitMQ.Next/Transport/Methods/Connection/SecureMethodParser.cs
@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+
+namespace RabbitMQ.Next.Transport.Methods.Connection;
+
+internal class SecureMethodParser : IMethodParser<SecureMethod>
+{
+    public SecureMethod Parse(ReadOnlySpan<byte> payload)
+    {
+        payload.Read(out byte[] challenge);
+
+        return new SecureMethod(challenge);
+    }
+}
\ No newline at end of file
diff --git a/src/RabbitMQ.Next/Transport/Methods/Connection/SecureOkMethod.cs b/src/RabbitMQ.Next/Transport/Methods/Connection/SecureOkMethod.cs
new file mode 100644
index 0000000..c8ebff9
--- /dev/null
+++ b/src/RabbitMQ.Next/Transport/Methods/Connection/SecureOkMethod.cs
@@ -0,0 +1,16 @@
+using System;
+using RabbitMQ.Next.Methods;
+
+namespace RabbitMQ.Next.Transport.Methods.Connection;
+
+public readonly struct SecureOkMethod : IOutgoingMethod
+{
+    public SecureOkMethod(ReadOnlyMemory<byte> response)
+    {
+        this.Response = response;
+    }
+    
+    public MethodId MethodId => MethodId.ConnectionSecureOk;
+    
+    public ReadOnlyMemory<byte> Response { get; }
+}
\ No newline at end of file
diff --git a/src/RabbitMQ.Next/Transport/Methods/Connection/SecureOkMethodFormatter.cs b/src/RabbitMQ.Next/Transport/Methods/Connection/SecureOkMethodFormatter.cs
new file mode 100644
index 0000000..0d1ab2b
--- /dev/null
+++ b/src/RabbitMQ.Next/Transport/Methods/Connection/SecureOkMethodFormatter.cs
@@ -0,0 +1,9 @@
+using System;
+
+namespace RabbitMQ.Next.Transport.Methods.Connection;
+
+internal class SecureOkMethodFormatter : IMethodFormatter<SecureOkMethod>
+{
+    public Span<byte> Write(Span<byte> destination, SecureOkMethod method)
+        => destination.Write(method.Response.Span);
+}
\ No newline at end of file
diff --git a/src/RabbitMQ.Next/Transport/Methods/MethodRegistry.cs b/src/RabbitMQ.Next/Transport/Methods/MethodRegistry.cs
index 631727b..189db04 100644
--- a/src/RabbitMQ.Next/Transport/Methods/MethodRegistry.cs
+++ b/src/RabbitMQ.Next/Transport/Methods/MethodRegistry.cs
@@ -31,6 +31,8 @@ void Register<TMethod>(MethodId methodId, IMethodFormatter<TMethod> formatter =
         // ConnectionMethods
         Register(MethodId.ConnectionStart, parser: new Connection.StartMethodParser());
         Register(MethodId.ConnectionStartOk, formatter: new Connection.StartOkMethodFormatter());
+        Register(MethodId.ConnectionSecure, parser: new Connection.SecureMethodParser());
+        Register(MethodId.ConnectionSecureOk, formatter: new Connection.SecureOkMethodFormatter());
         Register(MethodId.ConnectionTune, parser: new Connection.TuneMethodParser());
         Register(MethodId.ConnectionTuneOk, formatter: new Connection.TuneOkMethodFormatter());
         Register(MethodId.ConnectionOpen, formatter: new Connection.OpenMethodFormatter());
diff --git a/tests/RabbitMQ.Next.Tests/Transport/Methods/Connection/ModelTests.cs b/tests/RabbitMQ.Next.Tests/Transport/Methods/Connection/ModelTests.cs
index d934e88..29346b5 100644
--- a/tests/RabbitMQ.Next.Tests/Transport/Methods/Connection/ModelTests.cs
+++ b/tests/RabbitMQ.Next.Tests/Transport/Methods/Connection/ModelTests.cs
@@ -47,7 +47,29 @@ public void StartOkMethod()
         Assert.Equal(locale, startOkMethod.Locale);
         Assert.Equal(clientProperties, startOkMethod.ClientProperties);
     }
+    
+    [Fact]
+    public void SecureMethod()
+    {
+        var challenge = "ping"u8.ToArray();
+        
+        var secureMethod = new SecureMethod(challenge);
 
+        Assert.Equal(MethodId.ConnectionSecure, secureMethod.MethodId);
+        Assert.Equal(challenge, secureMethod.Challenge);
+    }
+
+    [Fact]
+    public void SecureOkMethod()
+    {
+        var response = "pong"u8.ToArray();
+        
+        var startOkMethod = new SecureOkMethod(response);
+
+        Assert.Equal(MethodId.ConnectionSecureOk, startOkMethod.MethodId);
+        Assert.Equal(response, startOkMethod.Response);
+    }
+    
     [Fact]
     public void TuneMethod()
     {
diff --git a/tests/RabbitMQ.Next.Tests/Transport/Methods/Connection/SecureMethodPayload.dat b/tests/RabbitMQ.Next.Tests/Transport/Methods/Connection/SecureMethodPayload.dat
new file mode 100644
index 0000000..9693065
Binary files /dev/null and b/tests/RabbitMQ.Next.Tests/Transport/Methods/Connection/SecureMethodPayload.dat differ
diff --git a/tests/RabbitMQ.Next.Tests/Transport/Methods/Connection/SecureOkMethodPayload.dat b/tests/RabbitMQ.Next.Tests/Transport/Methods/Connection/SecureOkMethodPayload.dat
new file mode 100644
index 0000000..171899c
Binary files /dev/null and b/tests/RabbitMQ.Next.Tests/Transport/Methods/Connection/SecureOkMethodPayload.dat differ
diff --git a/tests/RabbitMQ.Next.Tests/Transport/Methods/Connection/SerializationTests.cs b/tests/RabbitMQ.Next.Tests/Transport/Methods/Connection/SerializationTests.cs
index d023c96..51f6f2f 100644
--- a/tests/RabbitMQ.Next.Tests/Transport/Methods/Connection/SerializationTests.cs
+++ b/tests/RabbitMQ.Next.Tests/Transport/Methods/Connection/SerializationTests.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using RabbitMQ.Next.Tests.Mocks;
 using RabbitMQ.Next.Transport.Methods.Connection;
@@ -54,6 +55,14 @@ public void StartOkMethodFormatter()
         this.TestFormatter(method);
     }
 
+    [Fact]
+    public void SecureMethodParser()
+        => this.TestParser(new SecureMethod("ping"u8.ToArray()), new SecureMethodComparer());
+    
+    [Fact]
+    public void SecureOkMethodFormatter()
+        => this.TestFormatter(new SecureOkMethod("pong"u8.ToArray()));
+
     [Fact]
     public void TuneMethodParser()
         => this.TestParser(new TuneMethod(2047, 131072, 60));
@@ -110,4 +119,13 @@ public int GetHashCode(StartMethod obj)
             return HashCode.Combine(obj.VersionMajor, obj.VersionMinor, obj.ServerProperties, obj.Mechanisms, obj.Locales);
         }
     }
+
+    private class SecureMethodComparer : IEqualityComparer<SecureMethod>
+    {
+        public bool Equals(SecureMethod x, SecureMethod y)
+            => x.Challenge.Span.SequenceEqual(y.Challenge.Span);
+
+        public int GetHashCode(SecureMethod obj)
+            => obj.Challenge.GetHashCode();
+    }
 }
\ No newline at end of file
diff --git a/tests/RabbitMQ.Next.Tests/Transport/Methods/SerializationTestBase.cs b/tests/RabbitMQ.Next.Tests/Transport/Methods/SerializationTestBase.cs
index 0b7d5d2..24624be 100644
--- a/tests/RabbitMQ.Next.Tests/Transport/Methods/SerializationTestBase.cs
+++ b/tests/RabbitMQ.Next.Tests/Transport/Methods/SerializationTestBase.cs
@@ -39,7 +39,7 @@ protected void TestParser<TMethod>(TMethod method, IEqualityComparer<TMethod> co
         var payload = Helpers.GetFileContent(payloadResName);
 
         var data = parser.Parse(payload);
-
+        
         Assert.Equal(method, data, comparer);
     }
 }
\ No newline at end of file