diff --git a/SignalMetadataKit/src/SMKSecretSessionCipher.swift b/SignalMetadataKit/src/SMKSecretSessionCipher.swift
index 37d8846..f543af8 100644
--- a/SignalMetadataKit/src/SMKSecretSessionCipher.swift
+++ b/SignalMetadataKit/src/SMKSecretSessionCipher.swift
@@ -12,6 +12,7 @@ public struct SecretSessionKnownSenderError: Error {
     public let senderDeviceId: UInt32
     public let cipherType: CiphertextMessage.MessageType
     public let groupId: Data?
+    public let unsealedContent: Data
     public let contentHint: UnidentifiedSenderMessageContent.ContentHint
     public let underlyingError: Error
 
@@ -20,6 +21,7 @@ public struct SecretSessionKnownSenderError: Error {
         self.senderDeviceId = messageContent.senderCertificate.sender.deviceId
         self.cipherType = messageContent.messageType
         self.groupId = messageContent.groupId.map { Data($0) }
+        self.unsealedContent = Data(messageContent.contents)
         self.contentHint = messageContent.contentHint
         self.underlyingError = underlyingError
     }
diff --git a/SignalMetadataKitTests/src/SMKSecretSessionCipherTest.swift b/SignalMetadataKitTests/src/SMKSecretSessionCipherTest.swift
index db17140..7944ae7 100644
--- a/SignalMetadataKitTests/src/SMKSecretSessionCipherTest.swift
+++ b/SignalMetadataKitTests/src/SMKSecretSessionCipherTest.swift
@@ -128,6 +128,14 @@ class SMKSecretSessionCipherTest: XCTestCase {
             XCTAssert(knownSenderError.underlyingError is SMKCertificateError )
             XCTAssertEqual(knownSenderError.contentHint, aliceContentHint)
             XCTAssertEqual(knownSenderError.groupId, aliceGroupId)
+            XCTAssertNoThrow(
+                try DecryptionErrorMessage(
+                    originalMessageBytes: knownSenderError.unsealedContent,
+                    type: knownSenderError.cipherType,
+                    timestamp: 31335,
+                    originalSenderDeviceId: knownSenderError.senderDeviceId
+                )
+            )
         } catch {
             XCTFail("Unexpected error: \(error)")
         }
@@ -195,6 +203,14 @@ class SMKSecretSessionCipherTest: XCTestCase {
             XCTAssert(knownSenderError.underlyingError is SMKCertificateError )
             XCTAssertEqual(knownSenderError.contentHint, aliceContentHint)
             XCTAssertEqual(knownSenderError.groupId, aliceGroupId)
+            XCTAssertNoThrow(
+                try DecryptionErrorMessage(
+                    originalMessageBytes: knownSenderError.unsealedContent,
+                    type: knownSenderError.cipherType,
+                    timestamp: 31338,
+                    originalSenderDeviceId: knownSenderError.senderDeviceId
+                )
+            )
         } catch {
             XCTFail("Unexpected error: \(error)")
         }
@@ -385,6 +401,14 @@ class SMKSecretSessionCipherTest: XCTestCase {
             XCTAssertEqual(knownSenderError.senderDeviceId, UInt32(aliceMockClient.deviceId))
             XCTAssertEqual(Data(knownSenderError.groupId!), "inyalowda".data(using: String.Encoding.utf8)!)
             XCTAssertEqual(knownSenderError.contentHint, .resendable)
+            XCTAssertNoThrow(
+                try DecryptionErrorMessage(
+                    originalMessageBytes: knownSenderError.unsealedContent,
+                    type: knownSenderError.cipherType,
+                    timestamp: 31335,
+                    originalSenderDeviceId: knownSenderError.senderDeviceId
+                )
+            )
 
             if case SignalError.invalidState(_) = knownSenderError.underlyingError {
                 // Expected