diff --git a/README.md b/README.md
index 36593b46858b30d5d678eca84644b2f9c3d34465..81a24d5be1208242f13315f57f598c3e735a25a8 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,6 @@ Silkaj is based on Python dependencies:
 - [Click](https://click.palletsprojects.com/): Command Line Interface Creation Kit.
 - [DuniterPy](https://git.duniter.org/clients/python/duniterpy/): Python APIs library to implement duniter clients softwares.
 - [Tabulate](https://bitbucket.org/astanin/python-tabulate/overview): to display charts.
-- [PyNaCl](https://github.com/pyca/pynacl/): Cryptography (NaCl) library.
 
 ### Names
 I wanted to call that program:
diff --git a/poetry.lock b/poetry.lock
index af0849027b779c0b2be8d630db5eaf07dbf13977..0edccfec3f8fdfc7c428b7c0a170cd5e665350a5 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -114,17 +114,6 @@ typing-extensions = ">=3.7.4"
 colorama = ["colorama (>=0.4.3)"]
 d = ["aiohttp (>=3.3.2)", "aiohttp-cors"]
 
-[[package]]
-name = "cffi"
-version = "1.14.3"
-description = "Foreign Function Interface for Python calling C code."
-category = "main"
-optional = false
-python-versions = "*"
-
-[package.dependencies]
-pycparser = "*"
-
 [[package]]
 name = "cfgv"
 version = "2.0.1"
@@ -439,14 +428,6 @@ category = "main"
 optional = false
 python-versions = "*"
 
-[[package]]
-name = "pycparser"
-version = "2.20"
-description = "C parser in Python"
-category = "main"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
 [[package]]
 name = "pylibscrypt"
 version = "1.8.0"
@@ -455,22 +436,6 @@ category = "main"
 optional = false
 python-versions = "*"
 
-[[package]]
-name = "pynacl"
-version = "1.4.0"
-description = "Python binding to the Networking and Cryptography (NaCl) library"
-category = "main"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[package.dependencies]
-cffi = ">=1.4.1"
-six = "*"
-
-[package.extras]
-docs = ["sphinx (>=1.6.5)", "sphinx-rtd-theme"]
-tests = ["pytest (>=3.2.1,!=3.3.0)", "hypothesis (>=3.27.0)"]
-
 [[package]]
 name = "pyparsing"
 version = "2.4.7"
@@ -704,7 +669,7 @@ testing = ["pathlib2", "unittest2", "jaraco.itertools", "func-timeout"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.5.3"
-content-hash = "a96244d66d62c496b64c1fcede2cab1ccdae720946b68f024cd1b27cb2c723b6"
+content-hash = "008ca3b883ea0ab8c3ebbf52be5329151bec0984ba9aff22848c2a20c38c4381"
 
 [metadata.files]
 aiohttp = [
@@ -758,44 +723,6 @@ black = [
     {file = "black-20.8b1-py3-none-any.whl", hash = "sha256:70b62ef1527c950db59062cda342ea224d772abdf6adc58b86a45421bab20a6b"},
     {file = "black-20.8b1.tar.gz", hash = "sha256:1c02557aa099101b9d21496f8a914e9ed2222ef70336404eeeac8edba836fbea"},
 ]
-cffi = [
-    {file = "cffi-1.14.3-2-cp27-cp27m-macosx_10_9_x86_64.whl", hash = "sha256:3eeeb0405fd145e714f7633a5173318bd88d8bbfc3dd0a5751f8c4f70ae629bc"},
-    {file = "cffi-1.14.3-2-cp35-cp35m-macosx_10_9_x86_64.whl", hash = "sha256:cb763ceceae04803adcc4e2d80d611ef201c73da32d8f2722e9d0ab0c7f10768"},
-    {file = "cffi-1.14.3-2-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:44f60519595eaca110f248e5017363d751b12782a6f2bd6a7041cba275215f5d"},
-    {file = "cffi-1.14.3-2-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:c53af463f4a40de78c58b8b2710ade243c81cbca641e34debf3396a9640d6ec1"},
-    {file = "cffi-1.14.3-2-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:33c6cdc071ba5cd6d96769c8969a0531be2d08c2628a0143a10a7dcffa9719ca"},
-    {file = "cffi-1.14.3-2-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:c11579638288e53fc94ad60022ff1b67865363e730ee41ad5e6f0a17188b327a"},
-    {file = "cffi-1.14.3-cp27-cp27m-manylinux1_i686.whl", hash = "sha256:3cb3e1b9ec43256c4e0f8d2837267a70b0e1ca8c4f456685508ae6106b1f504c"},
-    {file = "cffi-1.14.3-cp27-cp27m-manylinux1_x86_64.whl", hash = "sha256:f0620511387790860b249b9241c2f13c3a80e21a73e0b861a2df24e9d6f56730"},
-    {file = "cffi-1.14.3-cp27-cp27m-win32.whl", hash = "sha256:005f2bfe11b6745d726dbb07ace4d53f057de66e336ff92d61b8c7e9c8f4777d"},
-    {file = "cffi-1.14.3-cp27-cp27m-win_amd64.whl", hash = "sha256:2f9674623ca39c9ebe38afa3da402e9326c245f0f5ceff0623dccdac15023e05"},
-    {file = "cffi-1.14.3-cp27-cp27mu-manylinux1_i686.whl", hash = "sha256:09e96138280241bd355cd585148dec04dbbedb4f46128f340d696eaafc82dd7b"},
-    {file = "cffi-1.14.3-cp27-cp27mu-manylinux1_x86_64.whl", hash = "sha256:3363e77a6176afb8823b6e06db78c46dbc4c7813b00a41300a4873b6ba63b171"},
-    {file = "cffi-1.14.3-cp35-cp35m-manylinux1_i686.whl", hash = "sha256:0ef488305fdce2580c8b2708f22d7785ae222d9825d3094ab073e22e93dfe51f"},
-    {file = "cffi-1.14.3-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:0b1ad452cc824665ddc682400b62c9e4f5b64736a2ba99110712fdee5f2505c4"},
-    {file = "cffi-1.14.3-cp35-cp35m-win32.whl", hash = "sha256:85ba797e1de5b48aa5a8427b6ba62cf69607c18c5d4eb747604b7302f1ec382d"},
-    {file = "cffi-1.14.3-cp35-cp35m-win_amd64.whl", hash = "sha256:e66399cf0fc07de4dce4f588fc25bfe84a6d1285cc544e67987d22663393926d"},
-    {file = "cffi-1.14.3-cp36-cp36m-manylinux1_i686.whl", hash = "sha256:15f351bed09897fbda218e4db5a3d5c06328862f6198d4fb385f3e14e19decb3"},
-    {file = "cffi-1.14.3-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:4d7c26bfc1ea9f92084a1d75e11999e97b62d63128bcc90c3624d07813c52808"},
-    {file = "cffi-1.14.3-cp36-cp36m-manylinux2014_aarch64.whl", hash = "sha256:23e5d2040367322824605bc29ae8ee9175200b92cb5483ac7d466927a9b3d537"},
-    {file = "cffi-1.14.3-cp36-cp36m-win32.whl", hash = "sha256:a624fae282e81ad2e4871bdb767e2c914d0539708c0f078b5b355258293c98b0"},
-    {file = "cffi-1.14.3-cp36-cp36m-win_amd64.whl", hash = "sha256:de31b5164d44ef4943db155b3e8e17929707cac1e5bd2f363e67a56e3af4af6e"},
-    {file = "cffi-1.14.3-cp37-cp37m-manylinux1_i686.whl", hash = "sha256:f92cdecb618e5fa4658aeb97d5eb3d2f47aa94ac6477c6daf0f306c5a3b9e6b1"},
-    {file = "cffi-1.14.3-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:22399ff4870fb4c7ef19fff6eeb20a8bbf15571913c181c78cb361024d574579"},
-    {file = "cffi-1.14.3-cp37-cp37m-manylinux2014_aarch64.whl", hash = "sha256:f4eae045e6ab2bb54ca279733fe4eb85f1effda392666308250714e01907f394"},
-    {file = "cffi-1.14.3-cp37-cp37m-win32.whl", hash = "sha256:b0358e6fefc74a16f745afa366acc89f979040e0cbc4eec55ab26ad1f6a9bfbc"},
-    {file = "cffi-1.14.3-cp37-cp37m-win_amd64.whl", hash = "sha256:6642f15ad963b5092d65aed022d033c77763515fdc07095208f15d3563003869"},
-    {file = "cffi-1.14.3-cp38-cp38-manylinux1_i686.whl", hash = "sha256:2791f68edc5749024b4722500e86303a10d342527e1e3bcac47f35fbd25b764e"},
-    {file = "cffi-1.14.3-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:529c4ed2e10437c205f38f3691a68be66c39197d01062618c55f74294a4a4828"},
-    {file = "cffi-1.14.3-cp38-cp38-manylinux2014_aarch64.whl", hash = "sha256:8f0f1e499e4000c4c347a124fa6a27d37608ced4fe9f7d45070563b7c4c370c9"},
-    {file = "cffi-1.14.3-cp38-cp38-win32.whl", hash = "sha256:3b8eaf915ddc0709779889c472e553f0d3e8b7bdf62dab764c8921b09bf94522"},
-    {file = "cffi-1.14.3-cp38-cp38-win_amd64.whl", hash = "sha256:bbd2f4dfee1079f76943767fce837ade3087b578aeb9f69aec7857d5bf25db15"},
-    {file = "cffi-1.14.3-cp39-cp39-manylinux1_i686.whl", hash = "sha256:cc75f58cdaf043fe6a7a6c04b3b5a0e694c6a9e24050967747251fb80d7bce0d"},
-    {file = "cffi-1.14.3-cp39-cp39-manylinux1_x86_64.whl", hash = "sha256:bf39a9e19ce7298f1bd6a9758fa99707e9e5b1ebe5e90f2c3913a47bc548747c"},
-    {file = "cffi-1.14.3-cp39-cp39-win32.whl", hash = "sha256:d80998ed59176e8cba74028762fbd9b9153b9afc71ea118e63bbf5d4d0f9552b"},
-    {file = "cffi-1.14.3-cp39-cp39-win_amd64.whl", hash = "sha256:c150eaa3dadbb2b5339675b88d4573c1be3cb6f2c33a6c83387e10cc0bf05bd3"},
-    {file = "cffi-1.14.3.tar.gz", hash = "sha256:f92f789e4f9241cd262ad7a555ca2c648a98178a953af117ef7fad46aa1d5591"},
-]
 cfgv = [
     {file = "cfgv-2.0.1-py2.py3-none-any.whl", hash = "sha256:fbd93c9ab0a523bf7daec408f3be2ed99a980e20b2d19b50fc184ca6b820d289"},
     {file = "cfgv-2.0.1.tar.gz", hash = "sha256:edb387943b665bf9c434f717bf630fa78aecd53d5900d2e05da6ad6048553144"},
@@ -978,31 +905,9 @@ py = [
 pyaes = [
     {file = "pyaes-1.6.1.tar.gz", hash = "sha256:02c1b1405c38d3c370b085fb952dd8bea3fadcee6411ad99f312cc129c536d8f"},
 ]
-pycparser = [
-    {file = "pycparser-2.20-py2.py3-none-any.whl", hash = "sha256:7582ad22678f0fcd81102833f60ef8d0e57288b6b5fb00323d101be910e35705"},
-    {file = "pycparser-2.20.tar.gz", hash = "sha256:2d475327684562c3a96cc71adf7dc8c4f0565175cf86b6d7a404ff4c771f15f0"},
-]
 pylibscrypt = [
     {file = "pylibscrypt-1.8.0.tar.gz", hash = "sha256:893c4519afae05878f7aa313b76f6193e4d4b69d157b7febf6a5ef69ae3bf6e9"},
 ]
-pynacl = [
-    {file = "PyNaCl-1.4.0-cp27-cp27m-macosx_10_10_x86_64.whl", hash = "sha256:ea6841bc3a76fa4942ce00f3bda7d436fda21e2d91602b9e21b7ca9ecab8f3ff"},
-    {file = "PyNaCl-1.4.0-cp27-cp27m-manylinux1_x86_64.whl", hash = "sha256:d452a6746f0a7e11121e64625109bc4468fc3100452817001dbe018bb8b08514"},
-    {file = "PyNaCl-1.4.0-cp27-cp27m-win32.whl", hash = "sha256:2fe0fc5a2480361dcaf4e6e7cea00e078fcda07ba45f811b167e3f99e8cff574"},
-    {file = "PyNaCl-1.4.0-cp27-cp27m-win_amd64.whl", hash = "sha256:f8851ab9041756003119368c1e6cd0b9c631f46d686b3904b18c0139f4419f80"},
-    {file = "PyNaCl-1.4.0-cp27-cp27mu-manylinux1_x86_64.whl", hash = "sha256:7757ae33dae81c300487591c68790dfb5145c7d03324000433d9a2c141f82af7"},
-    {file = "PyNaCl-1.4.0-cp35-abi3-macosx_10_10_x86_64.whl", hash = "sha256:757250ddb3bff1eecd7e41e65f7f833a8405fede0194319f87899690624f2122"},
-    {file = "PyNaCl-1.4.0-cp35-abi3-manylinux1_x86_64.whl", hash = "sha256:30f9b96db44e09b3304f9ea95079b1b7316b2b4f3744fe3aaecccd95d547063d"},
-    {file = "PyNaCl-1.4.0-cp35-cp35m-win32.whl", hash = "sha256:06cbb4d9b2c4bd3c8dc0d267416aaed79906e7b33f114ddbf0911969794b1cc4"},
-    {file = "PyNaCl-1.4.0-cp35-cp35m-win_amd64.whl", hash = "sha256:511d269ee845037b95c9781aa702f90ccc36036f95d0f31373a6a79bd8242e25"},
-    {file = "PyNaCl-1.4.0-cp36-cp36m-win32.whl", hash = "sha256:11335f09060af52c97137d4ac54285bcb7df0cef29014a1a4efe64ac065434c4"},
-    {file = "PyNaCl-1.4.0-cp36-cp36m-win_amd64.whl", hash = "sha256:cd401ccbc2a249a47a3a1724c2918fcd04be1f7b54eb2a5a71ff915db0ac51c6"},
-    {file = "PyNaCl-1.4.0-cp37-cp37m-win32.whl", hash = "sha256:8122ba5f2a2169ca5da936b2e5a511740ffb73979381b4229d9188f6dcb22f1f"},
-    {file = "PyNaCl-1.4.0-cp37-cp37m-win_amd64.whl", hash = "sha256:537a7ccbea22905a0ab36ea58577b39d1fa9b1884869d173b5cf111f006f689f"},
-    {file = "PyNaCl-1.4.0-cp38-cp38-win32.whl", hash = "sha256:9c4a7ea4fb81536c1b1f5cc44d54a296f96ae78c1ebd2311bd0b60be45a48d96"},
-    {file = "PyNaCl-1.4.0-cp38-cp38-win_amd64.whl", hash = "sha256:7c6092102219f59ff29788860ccb021e80fffd953920c4a8653889c029b2d420"},
-    {file = "PyNaCl-1.4.0.tar.gz", hash = "sha256:54e9a2c849c742006516ad56a88f5c74bf2ce92c9f67435187c3c5953b346505"},
-]
 pyparsing = [
     {file = "pyparsing-2.4.7-py2.py3-none-any.whl", hash = "sha256:ef9d7589ef3c200abe66653d3f1ab1033c3c419ae9b9bdb1240a85b024efc88b"},
     {file = "pyparsing-2.4.7.tar.gz", hash = "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1"},
diff --git a/pyproject.toml b/pyproject.toml
index 9086f46ead9cb8b581d21a2ff5a6989362c2e3f2..cdf0cdc63f8736b4170bb594eee13f6afd6fb983 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,6 @@ ipaddress = "^1.0.23"
 tabulate = "^0.8.7"
 texttable = "^1.6.3"
 pendulum = "^2.1.2"
-PyNaCl = "^1.3"
 
 [tool.poetry.dev-dependencies]
 black = {version = "^20.8b1", python = "^3.6"}
diff --git a/silkaj/crypto_tools.py b/silkaj/crypto_tools.py
index 89a8057603f1a1f31c3b19a1cb970c48cde2e673..3a9db1d3ec2267038ac4b09b17acc9b163645709 100644
--- a/silkaj/crypto_tools.py
+++ b/silkaj/crypto_tools.py
@@ -19,7 +19,6 @@ import re
 import hashlib
 
 import base58
-from nacl import encoding
 
 from silkaj.constants import PUBKEY_PATTERN
 from silkaj.tools import message_exit