diff --git a/harmony-signing/.gitignore b/harmony-signing/.gitignore
new file mode 100644
index 0000000..f7275bb
--- /dev/null
+++ b/harmony-signing/.gitignore
@@ -0,0 +1 @@
+venv/
diff --git a/harmony-signing/README.md b/harmony-signing/README.md
new file mode 100644
index 0000000..329e99c
--- /dev/null
+++ b/harmony-signing/README.md
@@ -0,0 +1,50 @@
+# Harmony Signing Tool
+
+  Harmony releases various excutables (i.e. harmony block chain node code, command line tools etc)  regularly through harmony S3 buckets and open to public. 
+  For better safety, all the released binaries shall be signed by harmony siging key (a RSA 4096 asymmetric key). 
+  The private siging key is maintained by amazon aws KMS(Key Management Service) and the key is not visible by anyone from Harmony.
+
+  Only designated aws users (assigned by harmony aws administrator) with signing permission can use the private key to sign binary. 
+  The public key of harmony signing key is open to public and anyone can use it to verify the authencity of the binary.
+
+
+##  Setup the tools
+
+### Install virtualenv
+```bash
+[sudo] pip install -U setuptools
+[sudo] pip install virtualenv
+```
+
+### Install required packages in virtualenv
+```bash
+python3 -m virtualenv v
+source venv/bin/activate
+pip install -r requirement.txt
+deactivate
+```
+
+## Sign binary before releasing binary (requires AWS account and harmony signing key permission)
+
+  Now you can use the python script sign_binary.py to sign the executable. 
+  Please note that this script has to be invoked inside the virtual environment (source venv/bin/activate).
+  As the script requires the Harmony signing key, please login to your aws account before signing.
+ 
+  python signing_binary.py [binary_file] [signature_file]
+  An example signing session is shown below, where harmony is the executable and harmony.sig is the output signature.
+
+```bash
+source venv/bin/activate
+python sign_binary.py harmony harmony.sig
+```
+
+## Verify the signature on client side
+
+  Both harmony binary and signature file can be downloaded publically on harmony S3 buckets. Once downloaded, the authenticity of harmony binary should be verified.
+  The verification can be done by using the open source tool openssl and the harmony public key harmony_pubkey.pem..
+
+```bash
+openssl dgst -sha256 -verify harmony_pubkey.pem -signature harmony.sig harmony
+Verified OK
+```
+  The expected output from openssl should be "Verified OK".
diff --git a/harmony-signing/harmony b/harmony-signing/harmony
new file mode 100755
index 0000000..8993b9e
Binary files /dev/null and b/harmony-signing/harmony differ
diff --git a/harmony-signing/harmony.sig b/harmony-signing/harmony.sig
new file mode 100644
index 0000000..3f90f72
Binary files /dev/null and b/harmony-signing/harmony.sig differ
diff --git a/harmony-signing/harmony_pubkey.pem b/harmony-signing/harmony_pubkey.pem
new file mode 100644
index 0000000..b90734b
--- /dev/null
+++ b/harmony-signing/harmony_pubkey.pem
@@ -0,0 +1,14 @@
+-----BEGIN PUBLIC KEY-----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+-----END PUBLIC KEY-----
\ No newline at end of file
diff --git a/harmony-signing/requirement.txt b/harmony-signing/requirement.txt
new file mode 100644
index 0000000..82ecea6
--- /dev/null
+++ b/harmony-signing/requirement.txt
@@ -0,0 +1,14 @@
+attrs==19.3.0
+aws-encryption-sdk==1.4.1
+boto3==1.11.3
+botocore==1.14.3
+cffi==1.13.2
+cryptography==2.8
+docutils==0.15.2
+jmespath==0.9.4
+pycparser==2.19
+python-dateutil==2.8.1
+s3transfer==0.3.0
+six==1.14.0
+urllib3==1.25.7
+wrapt==1.11.2
diff --git a/harmony-signing/sign_binary.py b/harmony-signing/sign_binary.py
new file mode 100755
index 0000000..fdfda14
--- /dev/null
+++ b/harmony-signing/sign_binary.py
@@ -0,0 +1,53 @@
+import aws_encryption_sdk
+import boto3
+import sys
+import hashlib
+import binascii
+
+#key ID for harmony signing key, created by aws, using aws KMS 
+harmonySigningKeyId = "arn:aws:kms:us-west-2:656503231766:key/370d45bb-d629-45d7-8d1c-db0560895690"
+signingAlgorithm    = "RSASSA_PKCS1_V1_5_SHA_256"
+
+def region_from_key_id(signingKeyId, default_region=None):
+    try:
+        region_name = signingKeyId.split(":", 4)[3]
+    except IndexError:
+        if default_region is None:
+            raise UnknownRegionError(
+                "No default region found and no region determinable from key id: {}".format(signingKeyId)
+            )
+        region_name = default_region
+    return region_name
+
+
+def sign_harmony_file(inputFile, sigFile, keyId = harmonySigningKeyId):
+    region_name = region_from_key_id(keyId)
+    kms_client = boto3.client('kms', region_name)
+
+    data = open(inputFile, "rb").read()
+    digest = hashlib.sha256(data).digest()
+
+    print("File Name   : ", inputFile)
+    print("Digest      : ", binascii.hexlify(digest))
+    print("Sign Key ID : ", harmonySigningKeyId)
+    print("Algorithm   : ", signingAlgorithm)
+    print("Signature   : ", sigFile)
+
+    response = kms_client.sign(
+        KeyId = keyId,
+        Message = digest,
+        MessageType = 'DIGEST',
+        GrantTokens=[
+            'string',
+        ],
+        SigningAlgorithm=signingAlgorithm
+    )
+    #print(response)
+
+    signature = response['Signature']
+    open(sigFile,"wb").write(signature)
+
+    return True
+
+if __name__ == '__main__':
+    sign_harmony_file(sys.argv[1], sys.argv[2], harmonySigningKeyId)
diff --git a/harmony-signing/verify_binary.sh b/harmony-signing/verify_binary.sh
new file mode 100755
index 0000000..98ba32e
--- /dev/null
+++ b/harmony-signing/verify_binary.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+openssl dgst -sha256 -verify harmony_pubkey.pem -signature harmony.sig harmony