diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index adef325e..77522327 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   main_job:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     env:
       NIGHTLY_BUILD_FLAGS: "valgrind --leak-check=yes"
 
@@ -20,10 +20,10 @@ jobs:
         ACTIONS_ALLOW_UNSECURE_COMMANDS: true
     - name: Checkout
       uses: actions/checkout@v2
-    - name: Set up Python 3.6
-      uses: actions/setup-python@v1
-      with:
-        python-version: 3.6
+    # - name: Set up Python 3.6
+    #   uses: actions/setup-python@v1
+    #   with:
+    #     python-version: 3.6
     - name: Update apt
       run: |
         sudo add-apt-repository ppa:ubuntu-toolchain-r/test
@@ -92,7 +92,7 @@ jobs:
         ./scripts/run_tools_test.sh
   
   linux_build_with_emscripten:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
 
     strategy:
       matrix:
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index d0f50048..3489fb38 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -11,7 +11,7 @@ defaults:
     shell: bash
 jobs:
   build:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
 
     steps:
     - name: Extract repo name
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 12933b1b..c1555ce7 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,7 +11,7 @@ defaults:
     shell: bash
 jobs:
   linux_build_and_test:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-20.04
 
     steps:
     - name: Extract repo name
@@ -180,7 +180,7 @@ jobs:
         ./dkg_attack
 
   linux_build_with_emscripten:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-20.04
 
     strategy:
       matrix:
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 05a7091a..04650263 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,6 +41,7 @@ set( HUNTER_ENABLED OFF )
 
 option(BUILD_TESTS "Build tests" ON)
 option(BUILD_WITH_FPIC "Build with -fPIC" OFF)
+option(BUILD_UTILS "Build utils" ON)
 
 option( BLS_PROFILING "Build for profiling" OFF )
 if( SKALED_PROFILING OR CONSENSUS_PROFILING )
@@ -179,63 +180,65 @@ target_link_libraries(bls PRIVATE ff ${CRYPTOPP_LIBRARY} ${GMPXX_LIBRARY} ${GMP_
 
 add_subdirectory(threshold_encryption)
 
-add_executable(dkg_keygen tools/dkg_key_gen.cpp)
-target_include_directories(dkg_keygen PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
-if (EMSCRIPTEN)
-	target_compile_options(dkg_keygen PRIVATE -s DISABLE_EXCEPTION_CATCHING=1)
-	set_target_properties(dkg_keygen PROPERTIES LINK_FLAGS "-s DISABLE_EXCEPTION_CATCHING=1")
+if (BUILD_UTILS)
+        add_executable(dkg_keygen tools/dkg_key_gen.cpp)
+        target_include_directories(dkg_keygen PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+        if (EMSCRIPTEN)
+                target_compile_options(dkg_keygen PRIVATE -s DISABLE_EXCEPTION_CATCHING=1)
+                set_target_properties(dkg_keygen PROPERTIES LINK_FLAGS "-s DISABLE_EXCEPTION_CATCHING=1")
+        endif()
+
+        target_link_libraries(dkg_keygen PRIVATE bls ${CRYPTOPP_LIBRARY} ff ${GMPXX_LIBRARY} ${GMP_LIBRARY} ${BOOST_LIBS_4_BLS})
+
+        add_executable(dkg_glue tools/dkg_glue.cpp)
+        target_include_directories(dkg_glue PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+        if (EMSCRIPTEN)
+                target_compile_options(dkg_glue PRIVATE -s DISABLE_EXCEPTION_CATCHING=1)
+                set_target_properties(dkg_glue PROPERTIES LINK_FLAGS "-s DISABLE_EXCEPTION_CATCHING=1")
+        endif()
+        target_link_libraries(dkg_glue PRIVATE bls ${CRYPTOPP_LIBRARY} ff ${GMPXX_LIBRARY} ${GMP_LIBRARY} ${BOOST_LIBS_4_BLS})
+
+        add_executable(sign_bls tools/sign_bls.cpp)
+        target_include_directories(sign_bls PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+        if (EMSCRIPTEN)
+                target_compile_options(sign_bls PRIVATE -s DISABLE_EXCEPTION_CATCHING=1)
+                set_target_properties(sign_bls PROPERTIES LINK_FLAGS "-s DISABLE_EXCEPTION_CATCHING=1")
+        endif()
+        target_link_libraries(sign_bls PRIVATE bls ${CRYPTOPP_LIBRARY} ff ${GMPXX_LIBRARY} ${GMP_LIBRARY} ${BOOST_LIBS_4_BLS})
+
+        add_executable(hash_g1 tools/hash_g1.cpp)
+        target_include_directories(hash_g1 PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+        if (EMSCRIPTEN)
+                target_compile_options(hash_g1 PRIVATE -s DISABLE_EXCEPTION_CATCHING=1)
+                set_target_properties(hash_g1 PROPERTIES LINK_FLAGS "-s DISABLE_EXCEPTION_CATCHING=1")
+        endif()
+        target_link_libraries(hash_g1 PRIVATE bls ${CRYPTOPP_LIBRARY} ff ${GMPXX_LIBRARY} ${GMP_LIBRARY} ${BOOST_LIBS_4_BLS})
+
+        add_executable(bls_glue tools/bls_glue.cpp)
+        target_include_directories(bls_glue PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+        if (EMSCRIPTEN)
+                target_compile_options(bls_glue PRIVATE -s DISABLE_EXCEPTION_CATCHING=1)
+                set_target_properties(bls_glue PROPERTIES LINK_FLAGS "-s DISABLE_EXCEPTION_CATCHING=1")
+        endif()
+        target_link_libraries(bls_glue PRIVATE bls ${CRYPTOPP_LIBRARY} ff ${GMPXX_LIBRARY} ${GMP_LIBRARY} ${BOOST_LIBS_4_BLS})
+
+        add_executable(verify_bls tools/verify_bls.cpp)
+        target_include_directories(verify_bls PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+        if (EMSCRIPTEN)
+                target_compile_options(verify_bls PRIVATE -s DISABLE_EXCEPTION_CATCHING=1)
+                set_target_properties(verify_bls PROPERTIES LINK_FLAGS "-s DISABLE_EXCEPTION_CATCHING=1")
+        endif()
+        target_link_libraries(verify_bls PRIVATE bls ${CRYPTOPP_LIBRARY} ff ${GMPXX_LIBRARY} ${GMP_LIBRARY} ${BOOST_LIBS_4_BLS})
+
+        add_executable(generate_key_system tools/generate_key_system.cpp)
+        target_include_directories(generate_key_system PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+        if (EMSCRIPTEN)
+                target_compile_options(generate_key_system PRIVATE -s DISABLE_EXCEPTION_CATCHING=1)
+                set_target_properties(generate_key_system PROPERTIES LINK_FLAGS "-s DISABLE_EXCEPTION_CATCHING=1")
+        endif()
+        target_link_libraries(generate_key_system PRIVATE bls ${CRYPTOPP_LIBRARY} ff ${GMPXX_LIBRARY} ${GMP_LIBRARY} ${BOOST_LIBS_4_BLS})
 endif()
 
-target_link_libraries(dkg_keygen PRIVATE bls ${CRYPTOPP_LIBRARY} ff ${GMPXX_LIBRARY} ${GMP_LIBRARY} ${BOOST_LIBS_4_BLS})
-
-add_executable(dkg_glue tools/dkg_glue.cpp)
-target_include_directories(dkg_glue PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
-if (EMSCRIPTEN)
-	target_compile_options(dkg_glue PRIVATE -s DISABLE_EXCEPTION_CATCHING=1)
-	set_target_properties(dkg_glue PROPERTIES LINK_FLAGS "-s DISABLE_EXCEPTION_CATCHING=1")
-endif()
-target_link_libraries(dkg_glue PRIVATE bls ${CRYPTOPP_LIBRARY} ff ${GMPXX_LIBRARY} ${GMP_LIBRARY} ${BOOST_LIBS_4_BLS})
-
-add_executable(sign_bls tools/sign_bls.cpp)
-target_include_directories(sign_bls PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
-if (EMSCRIPTEN)
-	target_compile_options(sign_bls PRIVATE -s DISABLE_EXCEPTION_CATCHING=1)
-	set_target_properties(sign_bls PROPERTIES LINK_FLAGS "-s DISABLE_EXCEPTION_CATCHING=1")
-endif()
-target_link_libraries(sign_bls PRIVATE bls ${CRYPTOPP_LIBRARY} ff ${GMPXX_LIBRARY} ${GMP_LIBRARY} ${BOOST_LIBS_4_BLS})
-
-add_executable(hash_g1 tools/hash_g1.cpp)
-target_include_directories(hash_g1 PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
-if (EMSCRIPTEN)
-	target_compile_options(hash_g1 PRIVATE -s DISABLE_EXCEPTION_CATCHING=1)
-	set_target_properties(hash_g1 PROPERTIES LINK_FLAGS "-s DISABLE_EXCEPTION_CATCHING=1")
-endif()
-target_link_libraries(hash_g1 PRIVATE bls ${CRYPTOPP_LIBRARY} ff ${GMPXX_LIBRARY} ${GMP_LIBRARY} ${BOOST_LIBS_4_BLS})
-
-add_executable(bls_glue tools/bls_glue.cpp)
-target_include_directories(bls_glue PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
-if (EMSCRIPTEN)
-	target_compile_options(bls_glue PRIVATE -s DISABLE_EXCEPTION_CATCHING=1)
-	set_target_properties(bls_glue PROPERTIES LINK_FLAGS "-s DISABLE_EXCEPTION_CATCHING=1")
-endif()
-target_link_libraries(bls_glue PRIVATE bls ${CRYPTOPP_LIBRARY} ff ${GMPXX_LIBRARY} ${GMP_LIBRARY} ${BOOST_LIBS_4_BLS})
-
-add_executable(verify_bls tools/verify_bls.cpp)
-target_include_directories(verify_bls PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
-if (EMSCRIPTEN)
-	target_compile_options(verify_bls PRIVATE -s DISABLE_EXCEPTION_CATCHING=1)
-	set_target_properties(verify_bls PROPERTIES LINK_FLAGS "-s DISABLE_EXCEPTION_CATCHING=1")
-endif()
-target_link_libraries(verify_bls PRIVATE bls ${CRYPTOPP_LIBRARY} ff ${GMPXX_LIBRARY} ${GMP_LIBRARY} ${BOOST_LIBS_4_BLS})
-
-add_executable(generate_key_system tools/generate_key_system.cpp)
-target_include_directories(generate_key_system PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
-if (EMSCRIPTEN)
-	target_compile_options(generate_key_system PRIVATE -s DISABLE_EXCEPTION_CATCHING=1)
-	set_target_properties(generate_key_system PROPERTIES LINK_FLAGS "-s DISABLE_EXCEPTION_CATCHING=1")
-endif()
-target_link_libraries(generate_key_system PRIVATE bls ${CRYPTOPP_LIBRARY} ff ${GMPXX_LIBRARY} ${GMP_LIBRARY} ${BOOST_LIBS_4_BLS})
-
 if(BUILD_TESTS)
 	add_executable(bls_unit_test test/unit_tests_bls.cpp)
 	target_include_directories(bls_unit_test PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})