diff --git a/.github/workflows/library_interop_test_vectors.yml b/.github/workflows/library_interop_test_vectors.yml
index 9b0a73e59..dc89e61a3 100644
--- a/.github/workflows/library_interop_test_vectors.yml
+++ b/.github/workflows/library_interop_test_vectors.yml
@@ -91,6 +91,7 @@ jobs:
             CORES=$(node -e 'console.log(os.cpus().length)')
             make transpile_net
             make write_correct_main_net
+            
         - name: Setup gradle
           if: matrix.language == 'java'
           uses: gradle/gradle-build-action@v2
@@ -103,7 +104,7 @@ jobs:
           with:
             aws-region: us-west-2
             role-to-assume: arn:aws:iam::370957321024:role/GitHub-CI-Public-ESDK-Dafny-Role-us-west-2 
-            role-session-name: NetTests
+            role-session-name: InterOpTests
         
         - name: Create Manifests
           working-directory: ./${{ matrix.library }}
@@ -111,4 +112,109 @@ jobs:
 
         - name: Create Encrypt Manifests
           working-directory: ./${{ matrix.library }}
-          run: make test_encrypt_vectors_${{ matrix.language }}
\ No newline at end of file
+          run: make test_encrypt_vectors_${{ matrix.language }}
+      
+        - name: Upload Encrypt Manifest and keys.json files
+          uses: actions/upload-artifact@v4
+          with:
+            name: ${{matrix.os}}_vector_artifact_${{matrix.language}}
+            path: |
+              ./${{matrix.library}}/runtimes/${{matrix.language}}/*.json
+              ./${{matrix.library}}/runtimes/${{matrix.language}}/plaintexts
+              ./${{matrix.library}}/runtimes/${{matrix.language}}/ciphertexts
+  
+  testInteroperablity:
+    needs: generateEncryptVectors
+    strategy:
+      matrix:
+        library: [TestVectors]
+        os: [
+            # https://taskei.amazon.dev/tasks/CrypTool-5283
+            # windows-latest,
+            ubuntu-latest,
+            macos-12,
+          ]
+        language: [java, net]
+        # https://taskei.amazon.dev/tasks/CrypTool-5284
+        dotnet-version: ["6.0.x"]
+    runs-on: ${{ matrix.os }}
+    permissions:
+      id-token: write
+      contents: read
+    
+    steps:
+      - name: Support longpaths on Git checkout
+        run: |
+          git config --global core.longpaths true
+      # TestVectors will call KMS
+      - name: Configure AWS Credentials
+        uses: aws-actions/configure-aws-credentials@v2
+        with:
+          aws-region: us-west-2
+          role-to-assume: arn:aws:iam::370957321024:role/GitHub-CI-Public-ESDK-Dafny-Role-us-west-2 
+          role-session-name: InterOpTests
+      
+      - uses: actions/checkout@v3
+      #  Not all submodules are needed.
+      # We manually pull the submodule we DO need.
+      - run: git submodule update --init libraries
+      - run: git submodule update --init --recursive mpl
+
+      # Set up runtimes
+      - name: Setup .NET Core SDK ${{ matrix.dotnet-version }}
+        if: matrix.decrypting_language == 'net'
+        uses: actions/setup-dotnet@v3
+        with:
+          dotnet-version: ${{ matrix.dotnet-version }}
+
+      - name: Setup Java 17
+        if: matrix.decrypting_language == 'java'
+        uses: actions/setup-java@v3
+        with:
+          distribution: "corretto"
+          java-version: 17
+
+      - name: Setup Dafny
+        uses: dafny-lang/setup-dafny-action@v1.6.1
+        with:
+          dafny-version: ${{ inputs.dafny }}
+
+      - name: Regenerate code using smithy-dafny if necessary
+        if: ${{ inputs.regenerate-code }}
+        uses: ./.github/actions/polymorph_codegen
+        with:
+          dafny: ${{ inputs.dafny }}
+          library: ${{ matrix.library }}
+          diff-generated-code: false
+
+      # Build implementation for each runtime
+      - name: Build ${{ matrix.library }} implementation in Java
+        if: matrix.language == 'java'
+        shell: bash
+        working-directory: ./${{ matrix.library }}
+        run: |
+          # This works because `node` is installed by default on GHA runners
+          CORES=$(node -e 'console.log(os.cpus().length)')
+          make build_java CORES=$CORES
+          make write_correct_main_java
+
+      - name: Build ${{ matrix.library }} implementation in .NET
+        if: matrix.language == 'net'
+        shell: bash
+        working-directory: ./${{ matrix.library }}
+        run: |
+          # This works because `node` is installed by default on GHA runners
+          CORES=$(node -e 'console.log(os.cpus().length)')
+          make transpile_net
+          make write_correct_main_net
+          
+      - name: Download Encrypt Manifest Artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: ${{matrix.os}}_vector_artifact_${{matrix.encrypting_language}}
+          path: ./${{matrix.library}}/runtimes/${{matrix.decrypting_language}}
+
+      - name: Decrypt Encrypt Manifest
+        working-directory: ./${{ matrix.library }}
+        run: make test_decrypt_encrypt_vectors_${{matrix.decrypting_language}}
+
diff --git a/TestVectors/.gitignore b/TestVectors/.gitignore
index ad4090a73..4db3e5410 100644
--- a/TestVectors/.gitignore
+++ b/TestVectors/.gitignore
@@ -5,8 +5,13 @@ ImplementationFromDafny-cs.dtr
 TestsFromDafny-cs.dtr
 **/bin
 **/obj
-/runtimes/java/dafny
-/runtimes/java/encrypt-manifest.json
+runtimes/java/dafny
+runtimes/**/encrypt-manifest.json
+runtimes/**/decrypt-manifest.json
+runtimes/**/keys.json
+runtimes/**/ciphertexts/
+runtimes/**/plaintexts/
+
 dafny/TestVectors/test/ciphertexts
 dafny/TestVectors/test/plaintexts
 dafny/TestVectors/test/test.json
diff --git a/TestVectors/runtimes/java/build.gradle.kts b/TestVectors/runtimes/java/build.gradle.kts
index 1bad4290e..449254ba5 100644
--- a/TestVectors/runtimes/java/build.gradle.kts
+++ b/TestVectors/runtimes/java/build.gradle.kts
@@ -55,7 +55,7 @@ tasks.register<Copy>("copyKeysJSON") {
 }
 
 tasks.register<Copy>("copyKeysJSONCurr") {
-    from(layout.projectDirectory.file("../../dafny/ESDK/TestVectors/keys.json"))
+    from(layout.projectDirectory.file("../../dafny/TestVectors/test/keys.json"))
     into(layout.projectDirectory.dir("."))
 }