diff --git a/.circleci/config.yml b/.circleci/config.yml
index 9adfc4f1..bf8596aa 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -40,8 +40,8 @@ jobs:
       - run:
           name: Spot-test Provider -- One baseline and one hybrid QSC alg
           command: |
-            docker run --rm --name oqs-ossl3 oqs-ossl3-img sh -c "/opt/oqssa/bin/serverstart.sh; sleep 2; echo 'GET /' | openssl s_client -connect localhost --groups kyber512 --CAfile /opt/oqssa/bin/CA.crt" &&
-            docker run --rm --name oqs-ossl3 oqs-ossl3-img sh -c "KEM_ALG=p521_frodo1344aes /opt/oqssa/bin/serverstart.sh; sleep 2; echo 'GET /' | openssl s_client -connect localhost --groups p521_frodo1344aes --CAfile /opt/oqssa/bin/CA.crt"
+            docker run --rm --name oqs-ossl3 oqs-ossl3-img sh -c "openssl list -providers; /opt/openssl32/bin/serverstart.sh; sleep 2; echo 'GET /' | openssl s_client -connect localhost --groups kyber768 --CAfile /opt/openssl32/bin/CA.crt" &&
+            docker run --rm --name oqs-ossl3 oqs-ossl3-img sh -c "KEM_ALG=p521_frodo1344aes /opt/openssl32/bin/serverstart.sh; sleep 2; echo 'GET /' | openssl s_client -connect localhost --groups p521_frodo1344aes --CAfile /opt/openssl32/bin/CA.crt"
       - when:
           condition:
             or:
@@ -418,7 +418,7 @@ jobs:
           command: |
             docker network create ngtcp2-test
             docker run --network ngtcp2-test --name oqs-ngtcp2server oqs-ngtcp2-server &
-            docker run --network ngtcp2-test -it --name oqs-ngtcp2client oqs-ngtcp2-client sh -c 'client --exit-on-first-stream-close --groups kyber512 oqs-ngtcp2server 6000'
+            docker run --network ngtcp2-test -it --name oqs-ngtcp2client oqs-ngtcp2-client sh -c 'qtlsclient --exit-on-first-stream-close --groups kyber512 oqs-ngtcp2server 6000'
             docker logs oqs-ngtcp2client | grep "QUIC handshake has been confirmed"
             docker rm oqs-ngtcp2client
             docker stop oqs-ngtcp2server
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
new file mode 100644
index 00000000..7f43ab30
--- /dev/null
+++ b/.github/workflows/linux.yml
@@ -0,0 +1,112 @@
+name: 
+
+on:
+  push:
+    branches: [ '*' ]
+  pull_request:
+    branches: [ "main" ]
+  repository_dispatch:
+    types: [ '*' ]
+
+env:
+  REGISTRY_IMAGE: openquantumsafe/openssl3
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          - linux/amd64
+#          - linux/arm/v6
+#          - linux/arm/v7
+#          - linux/arm64
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY_IMAGE }}
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      -
+        name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Build and push OpenSSL3+oqs-provider by digest
+        id: build
+        uses: docker/build-push-action@v4
+        with:
+          context: openssl3
+          platforms: ${{ matrix.platform }}
+          labels: ${{ steps.meta.outputs.labels }}
+          outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+#          cache-from: type=registry,ref=${{ env.REGISTRY_IMAGE }}:buildcache
+#          cache-to: type=registry,ref=${{ env.REGISTRY_IMAGE }}:buildcache,mode=max
+      -
+        name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+      -
+        name: Upload digest
+        uses: actions/upload-artifact@v3
+        with:
+          name: digests
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+  
+  merge:
+    runs-on: ubuntu-latest
+    needs:
+      - build
+    if: github.ref == 'refs/heads/main'
+    steps:
+      -
+        name: Download digests
+        uses: actions/download-artifact@v3
+        with:
+          name: digests
+          path: /tmp/digests
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      -
+        name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY_IMAGE }}
+      -
+        name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Create manifest list and push
+        working-directory: /tmp/digests
+        run: |
+          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)
+      -
+        name: Inspect image
+        run: |
+          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.meta.outputs.version }}
+
diff --git a/ngtcp2/Dockerfile-client b/ngtcp2/Dockerfile-client
index 45cb8e2f..d95a1b01 100644
--- a/ngtcp2/Dockerfile-client
+++ b/ngtcp2/Dockerfile-client
@@ -50,7 +50,7 @@ RUN mkdir /opt/lib && cd /opt/lib && \
         cp /opt/ngtcp2/lib/.libs/libngtcp2.so.* . && \
         cp /usr/lib/libev.so.* . && \
         cp /opt/nghttp3/build/lib/libnghttp3.so.* . && \
-        cp /opt/ngtcp2/crypto/openssl/.libs/libngtcp2_crypto_openssl.so.* . && \
+        cp /opt/ngtcp2/crypto/quictls/.libs/libngtcp2_crypto_quictls.so.* . && \
         cp /opt/oqssa/lib64/libssl.so.* . && \
         cp /opt/oqssa/lib64/libcrypto.so.* . && \
         cp /usr/lib/libstdc++.so.* . && \
@@ -63,9 +63,9 @@ ENV DEBIAN_FRONTEND=noninteractive
 RUN apk update && apk upgrade
 
 # copy executable
-COPY --from=intermediate /opt/ngtcp2/examples/client /usr/local/bin
+COPY --from=intermediate /opt/ngtcp2/examples/qtlsclient /usr/local/bin
 
 # copy shared object dependencies and configuration file
 COPY --from=intermediate /opt/lib /usr/local/lib
 COPY --from=intermediate /opt/oqssa/lib64/ossl-modules/oqsprovider.so /opt/oqssa/lib64/ossl-modules/oqsprovider.so
-COPY --from=intermediate /opt/oqssa/ssl/openssl.cnf /opt/oqssa/ssl/openssl.cnf
\ No newline at end of file
+COPY --from=intermediate /opt/oqssa/ssl/openssl.cnf /opt/oqssa/ssl/openssl.cnf
diff --git a/ngtcp2/Dockerfile-server b/ngtcp2/Dockerfile-server
index f92022e9..5a83850d 100644
--- a/ngtcp2/Dockerfile-server
+++ b/ngtcp2/Dockerfile-server
@@ -54,7 +54,7 @@ RUN mkdir /opt/lib && cd /opt/lib && \
         cp /opt/ngtcp2/lib/.libs/libngtcp2.so.* . && \
         cp /usr/lib/libev.so.* . && \
         cp /opt/nghttp3/build/lib/libnghttp3.so.* . && \
-        cp /opt/ngtcp2/crypto/openssl/.libs/libngtcp2_crypto_openssl.so.* . && \
+        cp /opt/ngtcp2/crypto/quictls/.libs/libngtcp2_crypto_quictls.so.* . && \
         cp /opt/oqssa/lib64/libssl.so.* . && \
         cp /opt/oqssa/lib64/libcrypto.so.* . && \
         cp /usr/lib/libstdc++.so.* . && \
@@ -68,7 +68,7 @@ RUN apk update && apk upgrade && apk add mailcap && echo "This is my index page"
 COPY ./serverstart.sh .
 
 # copy executable
-COPY --from=intermediate /opt/ngtcp2/examples/server /usr/local/bin
+COPY --from=intermediate /opt/ngtcp2/examples/qtlsserver /usr/local/bin
 
 # Copy server key and self-signed certificate files 
 COPY --from=intermediate /certs /certs
@@ -78,4 +78,4 @@ COPY --from=intermediate /opt/lib /usr/local/lib
 COPY --from=intermediate /opt/oqssa/lib64/ossl-modules/oqsprovider.so /opt/oqssa/lib64/ossl-modules/oqsprovider.so
 COPY --from=intermediate /opt/oqssa/ssl/openssl.cnf /opt/oqssa/ssl/openssl.cnf
 
-CMD ["./serverstart.sh"]
\ No newline at end of file
+CMD ["./serverstart.sh"]
diff --git a/ngtcp2/serverstart.sh b/ngtcp2/serverstart.sh
index d9aa6b18..68e1873d 100755
--- a/ngtcp2/serverstart.sh
+++ b/ngtcp2/serverstart.sh
@@ -7,4 +7,4 @@ if [ "x$KEM_ALG" == "x" ]; then
 fi
 
 # Start ngtcp2 server accepting only the specified KEM_ALG
-server --groups $KEM_ALG "*" 6000 /certs/server.key /certs/server.crt
\ No newline at end of file
+qtlsserver --groups $KEM_ALG "*" 6000 /certs/server.key /certs/server.crt
diff --git a/openssl3/Dockerfile b/openssl3/Dockerfile
index 19fd651d..52ea59d9 100644
--- a/openssl3/Dockerfile
+++ b/openssl3/Dockerfile
@@ -1,105 +1,134 @@
 # Multi-stage build: First the full builder image:
 
-# Default location where all binaries wind up:
-ARG INSTALLDIR=/opt/oqssa
+ARG INSTALLDIR_OPENSSL=/opt/openssl32
+ARG INSTALLDIR_LIBOQS=/opt/liboqs
 
 # liboqs build type variant; maximum portability of image:
 ARG LIBOQS_BUILD_DEFINES="-DOQS_DIST_BUILD=ON"
 
 # Define the degree of parallelism when building the image; leave the number away only if you know what you are doing
-ARG MAKE_DEFINES="-j 2"
+ARG MAKE_DEFINES="-j 8"
 
-# Change this at your own risk: OSSL3 can handle OQS-sigs only
-# after https://github.com/openssl/openssl/pull/19312 lands
-ARG SIG_ALG="rsa:2048"
+ARG SIG_ALG="dilithium3"
 
-FROM alpine:3.13 as intermediate
+FROM alpine:3.13 as buildopenssl
 # Take in all global args
-ARG CURL_VERSION
-ARG INSTALLDIR
+ARG INSTALLDIR_OPENSSL
+ARG INSTALLDIR_LIBOQS
 ARG LIBOQS_BUILD_DEFINES
 ARG MAKE_DEFINES
 ARG SIG_ALG
 
 LABEL version="1"
-
 ENV DEBIAN_FRONTEND noninteractive
 
 RUN apk update && apk upgrade
 
-# Get all software packages required for builing all components:
+# Get all software packages required for builing openssl
+RUN apk add build-base linux-headers \
+            libtool automake autoconf \
+            make \
+            git wget
+
+# get current openssl sources
+RUN mkdir /optbuild && cd /optbuild && git clone --depth 1 --branch master https://github.com/openssl/openssl.git
+
+# build OpenSSL3
+WORKDIR /optbuild/openssl
+RUN LDFLAGS="-Wl,-rpath -Wl,${INSTALLDIR_OPENSSL}/lib64" ./config shared --prefix=${INSTALLDIR_OPENSSL} && \
+    make ${MAKE_DEFINES} && make install && if [ -d ${INSTALLDIR_OPENSSL}/lib64 ]; then ln -s ${INSTALLDIR_OPENSSL}/lib64 ${INSTALLDIR_OPENSSL}/lib; fi && if [ -d ${INSTALLDIR_OPENSSL}/lib ]; then ln -s ${INSTALLDIR_OPENSSL}/lib ${INSTALLDIR_OPENSSL}/lib64; fi 
+
+FROM alpine:3.13 as buildliboqs
+# Take in all global args
+ARG INSTALLDIR_OPENSSL
+ARG INSTALLDIR_LIBOQS
+ARG LIBOQS_BUILD_DEFINES
+ARG MAKE_DEFINES
+ARG SIG_ALG
+
+LABEL version="1"
+ENV DEBIAN_FRONTEND noninteractive
+
+# Get all software packages required for builing liboqs:
 RUN apk add build-base linux-headers \
             libtool automake autoconf cmake ninja \
             make \
-            openssl openssl-dev \
-            git docker wget
+            git wget
 
-# get all sources
-WORKDIR /opt
-RUN git clone --depth 1 --branch main https://github.com/open-quantum-safe/liboqs && \
-    git clone --depth 1 --branch master https://github.com/openssl/openssl.git && \
-    git clone --depth 1 --branch main https://github.com/open-quantum-safe/oqs-provider.git
+# Get OpenSSL image (from cache)
+COPY --from=buildopenssl ${INSTALLDIR_OPENSSL} ${INSTALLDIR_OPENSSL}
 
-WORKDIR /opt/liboqs
-RUN mkdir build && cd build && cmake -G"Ninja" .. ${LIBOQS_BUILD_DEFINES} -DCMAKE_INSTALL_PREFIX=${INSTALLDIR} && ninja install
+RUN mkdir /optbuild && cd /optbuild && git clone --depth 1 --branch main https://github.com/open-quantum-safe/liboqs
 
-# build OpenSSL3
-WORKDIR /opt/openssl
-RUN LDFLAGS="-Wl,-rpath -Wl,${INSTALLDIR}/lib64" ./config shared --prefix=${INSTALLDIR} && \
-    make ${MAKE_DEFINES} && make install;
+WORKDIR /optbuild/liboqs
+RUN mkdir build && cd build && cmake -G"Ninja" .. -DOPENSSL_ROOT_DIR=${INSTALLDIR_OPENSSL} ${LIBOQS_BUILD_DEFINES} -DCMAKE_INSTALL_PREFIX=${INSTALLDIR_LIBOQS} && ninja install
+
+FROM alpine:3.13 as buildoqsprovider
+# Take in all global args
+ARG INSTALLDIR_OPENSSL
+ARG INSTALLDIR_LIBOQS
+ARG LIBOQS_BUILD_DEFINES
+ARG MAKE_DEFINES
+ARG SIG_ALG
 
-# set path to use 'new' openssl & curl. Dyn libs have been properly linked in to match
-ENV PATH="${INSTALLDIR}/bin:${PATH}"
+LABEL version="1"
+ENV DEBIAN_FRONTEND noninteractive
+
+# Get all software packages required for builing oqsprovider
+RUN apk add build-base linux-headers \
+            libtool cmake ninja \
+            git wget
+
+RUN mkdir /optbuild && cd /optbuild && git clone --depth 1 --branch main https://github.com/open-quantum-safe/oqs-provider.git
+
+# Get openssl32 and liboqs
+COPY --from=buildopenssl ${INSTALLDIR_OPENSSL} ${INSTALLDIR_OPENSSL}
+COPY --from=buildliboqs ${INSTALLDIR_LIBOQS} ${INSTALLDIR_LIBOQS}
 
 # build & install provider (and activate by default)
-WORKDIR /opt/oqs-provider
-RUN ln -s ../openssl . && cmake -DOPENSSL_ROOT_DIR=${INSTALLDIR} -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=${INSTALLDIR} -S . -B _build && cmake --build _build  && cp _build/lib/oqsprovider.so ${INSTALLDIR}/lib64/ossl-modules && sed -i "s/default = default_sect/default = default_sect\noqsprovider = oqsprovider_sect/g" /opt/oqssa/ssl/openssl.cnf && sed -i "s/\[default_sect\]/\[default_sect\]\nactivate = 1\n\[oqsprovider_sect\]\nactivate = 1\n/g" /opt/oqssa/ssl/openssl.cnf
+WORKDIR /optbuild/oqs-provider
+RUN liboqs_DIR=${INSTALLDIR_LIBOQS} cmake -DOPENSSL_ROOT_DIR=${INSTALLDIR_OPENSSL} -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=${INSTALLDIR_OPENSSL} -S . -B _build && cmake --build _build  && cmake --install _build && cp _build/lib/oqsprovider.so ${INSTALLDIR_OPENSSL}/lib64/ossl-modules && sed -i "s/default = default_sect/default = default_sect\noqsprovider = oqsprovider_sect/g" ${INSTALLDIR_OPENSSL}/ssl/openssl.cnf && sed -i "s/\[default_sect\]/\[default_sect\]\nactivate = 1\n\[oqsprovider_sect\]\nactivate = 1\n/g" ${INSTALLDIR_OPENSSL}/ssl/openssl.cnf && sed -i "s/providers = provider_sect/providers = provider_sect\nssl_conf = ssl_sect\n\n\[ssl_sect\]\nsystem_default = system_default_sect\n\n\[system_default_sect\]\nGroups = \$ENV\:\:DEFAULT_GROUPS\n/g" ${INSTALLDIR_OPENSSL}/ssl/openssl.cnf && sed -i "s/HOME\t\t\t= ./HOME           = .\nDEFAULT_GROUPS = kyber768/g" ${INSTALLDIR_OPENSSL}/ssl/openssl.cnf
 
-# generate certificates for openssl s_server, which is what we will test curl against
-ENV OPENSSL=${INSTALLDIR}/bin/openssl
-ENV OPENSSL_CNF=${INSTALLDIR}/ssl/openssl.cnf
+WORKDIR ${INSTALLDIR_OPENSSL}/bin
+# set path to use 'new' openssl. Dyn libs have been properly linked in to match
+ENV PATH="${INSTALLDIR_OPENSSL}/bin:${PATH}"
 
-WORKDIR ${INSTALLDIR}/bin
 # generate CA key and cert
 RUN set -x; \
-    ${OPENSSL} req -x509 -new -newkey ${SIG_ALG} -keyout CA.key -out CA.crt -nodes -subj "/CN=oqstest CA" -days 365 -config ${OPENSSL_CNF}
+    openssl req -x509 -new -newkey ${SIG_ALG} -keyout CA.key -out CA.crt -nodes -subj "/CN=oqstest CA" -days 365
 
 ## second stage: Only create minimal image without build tooling and intermediate build results generated above:
 FROM alpine:3.13 as dev
 # Take in all global args
-ARG INSTALLDIR
+ARG INSTALLDIR_OPENSSL
 ARG SIG_ALG
 
-# Only retain the ${INSTALLDIR} contents in the final image
-COPY --from=intermediate ${INSTALLDIR} ${INSTALLDIR}
+# Only retain the ${INSTALLDIR_OPENSSL} contents in the final image
+COPY --from=buildoqsprovider ${INSTALLDIR_OPENSSL} ${INSTALLDIR_OPENSSL}
 
 # set path to use 'new' openssl. Dyn libs have been properly linked in to match
-ENV PATH="${INSTALLDIR}/bin:${PATH}"
+ENV PATH="${INSTALLDIR_OPENSSL}/bin:${PATH}"
 
 # generate certificates for openssl s_server, which is what we will test curl against
-ENV OPENSSL=${INSTALLDIR}/bin/openssl
-ENV OPENSSL_CNF=${INSTALLDIR}/ssl/openssl.cnf
-
-WORKDIR ${INSTALLDIR}/bin
+WORKDIR ${INSTALLDIR_OPENSSL}/bin
 
-# oqs-provider cannot deal with OQS sigs, so use classic crypto for sigs
 # generate server CSR using pre-set CA.key and cert
 # and generate server cert
-RUN set -x && mkdir /opt/test; \
-    ${OPENSSL} req -new -newkey ${SIG_ALG} -keyout /opt/test/server.key -out /opt/test/server.csr -nodes -subj "/CN=localhost" -config ${OPENSSL_CNF}; \
-    ${OPENSSL} x509 -req -in /opt/test/server.csr -out /opt/test/server.crt -CA CA.crt -CAkey CA.key -CAcreateserial -days 365;
+RUN set -x && mkdir -p /opt/test; \
+    openssl version && openssl list -providers && openssl req -new -newkey ${SIG_ALG} -keyout /opt/test/server.key -out /opt/test/server.csr -nodes -subj "/CN=localhost" && \
+    openssl x509 -req -in /opt/test/server.csr -out /opt/test/server.crt -CA CA.crt -CAkey CA.key -CAcreateserial -days 365;
 
-COPY serverstart.sh ${INSTALLDIR}/bin
+COPY serverstart.sh ${INSTALLDIR_OPENSSL}/bin
 
-WORKDIR ${INSTALLDIR}
+WORKDIR ${INSTALLDIR_OPENSSL}
 
 FROM dev
-ARG INSTALLDIR
+ARG INSTALLDIR_OPENSSL
 
 WORKDIR /
 
 # Enable a normal user to create new server keys off set CA
-RUN addgroup -g 1000 -S oqs && adduser --uid 1000 -S oqs -G oqs && chown -R oqs.oqs /opt/test && chmod go+r ${INSTALLDIR}/bin/CA.key 
+RUN addgroup -g 1000 -S oqs && adduser --uid 1000 -S oqs -G oqs && chown -R oqs.oqs /opt/test && chmod go+r ${INSTALLDIR_OPENSSL}/bin/CA.key 
 
 #USER oqs
 CMD ["serverstart.sh"]
diff --git a/openssl3/serverstart.sh b/openssl3/serverstart.sh
index f373ebb8..d525ba0b 100755
--- a/openssl3/serverstart.sh
+++ b/openssl3/serverstart.sh
@@ -3,13 +3,13 @@ set -e
 
 # Optionally set KEM to one defined in https://github.com/open-quantum-safe/openssl#key-exchange
 if [ "x$KEM_ALG" == "x" ]; then
-	export KEM_ALG=kyber512
+	export KEM_ALG=kyber768
 fi
 
-# OQS sig certs not yet supported in OSSL3 oqsprovider
-
 # Start a TLS1.3 test server based on OpenSSL accepting only the specified KEM_ALG
 openssl s_server -cert /opt/test/server.crt -key /opt/test/server.key -groups $KEM_ALG -www -tls1_3 -accept localhost:4433&
 
+echo "Test server started for KEM $KEM_ALG at port 4433"
+
 # Open a shell for local experimentation
 sh