diff --git a/README.md b/README.md
index 030363d..907ff9b 100644
--- a/README.md
+++ b/README.md
@@ -9,8 +9,8 @@ sudo apt install mosquitto-dev g++ cmake libmosquitto-dev mosquitto-clients open
 
 ## Generating offline keys
 ```
-openssl genpkey -algorithm RSA -out rsa_private.pem -pkeyopt rsa_keygen_bits:2048
-openssl rsa -in rsa_private.pem -pubout -out rsa_public.pem
+openssl ecparam -genkey -name prime256v1 -noout -out ec_private.pem
+openssl ec -in ec_private.pem -pubout -out ec_public.pem
 ```
 
 ## Converting Client Keys to Format for Browser
diff --git a/examples/key.pem b/examples/key.pem
index f1cfb72..e41b1a3 100644
--- a/examples/key.pem
+++ b/examples/key.pem
@@ -1,3 +1,3 @@
 -----BEGIN PUBLIC KEY-----
-MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAlIKdtC04YbRMO0L4ID4YOWLr2AxYpQZYZ3g9BNpVm+IjDdn4H5HaYwYvOcbdjKyRdmwm+rsrIbWxCGYQCD5TtaCnq1IGwOueoprgCTDNSpTxsKQ+JuEUIhKc4rygVhX7JKIvVikfWimKVuNJBVhut/O+/N0AarasszAyinc3gjwtu2SyLBdZtIe3Krs1MIvYb786J2RhK3GfLzrXVzmKjA2/ThB9D6sS7dtZCe//37kYZzGUv5+xFkjkKwZr2aULMlmpUosFd/S2w3zsZkGRELLTvdRf5PVKeGpk40EneETJAHwiMjX6+jO/vlFQIj/Ye66ypVhCCI+NizE/hWbdawIDAQAB
+MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEqdtuaoyDj8jCtgB9qfUMwDe//VLAF1HTXHTQ7OS8i/S3wjOC4YOHxRy9kYQ3LdE44r7kIX6DR8VLJ3srctQ0xw==
 -----END PUBLIC KEY-----
\ No newline at end of file
diff --git a/examples/mosquitto.conf b/examples/mosquitto.conf
index 6734a4e..c471e7b 100644
--- a/examples/mosquitto.conf
+++ b/examples/mosquitto.conf
@@ -1,17 +1,17 @@
 per_listener_settings true
 log_type all
 
-listener 9000
+listener 8082
 protocol websockets
 allow_anonymous false
-auth_plugin /opt/libj7s-plugin.so
-auth_opt_key_file /opt/websocket-keys.yaml
-auth_opt_acl_file /opt/websocket-acl.yaml
-
-listener 9001
-protocol mqtt
-allow_anonymous false
-auth_plugin /opt/libj7s-plugin.so
+auth_plugin /home/jimmy/Develop/mosquitto-plugin/build/libj7s-plugin.so
+auth_opt_key_file /home/jimmy/Develop/mosquitto-plugin/examples/keys.yaml
+auth_opt_acl_file /home/jimmy/Develop/mosquitto-plugin/examples/acl.yaml
+
+listener 8081
+protocol mqtt
+allow_anonymous false
+auth_plugin /home/jimmy/Develop/mosquitto-plugin/build/libj7s-plugin.so
 auth_opt_key_file /home/jimmy/Develop/mosquitto-plugin/examples/keys.yaml
 auth_opt_acl_file /home/jimmy/Develop/mosquitto-plugin/examples/acl.yaml
 
diff --git a/src/utils.cpp b/src/utils.cpp
index 8382ede..0f7aaf8 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -51,7 +51,7 @@ bool validate(const std::string &token, const std::string &username, const std::
     try
     {
         // Is the token valid?
-        const auto verifier = jwt::verify().allow_algorithm(jwt::algorithm::rs256(pub_key));
+        const auto verifier = jwt::verify().allow_algorithm(jwt::algorithm::es256(pub_key));
         verifier.verify(decoded_token);
     }
     catch (std::system_error &exception)
@@ -116,7 +116,7 @@ std::string gen_token(
                            .set_payload_claim("mqtt", jwt::claim(picojson::value(true)))
                            .set_issued_at(issue_time)
                            .set_expires_at(expr_time)
-                           .sign(jwt::algorithm::rs256(pub_key, priv_key, "", ""));
+                           .sign(jwt::algorithm::es256(pub_key, priv_key, "", ""));
 
     return token;
 }
diff --git a/test/token_test.cpp b/test/token_test.cpp
index 40111f1..edbbae9 100644
--- a/test/token_test.cpp
+++ b/test/token_test.cpp
@@ -18,83 +18,27 @@
 #include "gtest/gtest.h"
 
 const std::string priv_key_a =
-    R"(-----BEGIN PRIVATE KEY-----
-MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQC+ouwDpYOWDEyM
-nJhwejOn+boDxw4ntiOR3kRzIANuJrbEPf3UJFL+SPPzzY7NU1A6XPz/NAccbvfn
-c78dj12rsV6st5GuFx9QbxYn2XQb8vnxj+DhvSrNk+qy7IMaN/3NGrAoWemSIRIW
-VB7xbVybQyvAucgaTDKnU72viNOxqg8v5bGF+WtTjKwezmYtyQ8Z7dpGQbML1tkT
-EQwTq5nnLre8F/t6fTS4ziGVw7STggSroAHazphzYmqc3W68jY/SQefOilALwzFp
-/Cxoubj0d+f3OYT5jnfMPSpKJiYNlLqxCJPGjNcSRxjzzRt/cRYzhAPfriO/fkYG
-tQcLNB5dAgMBAAECggEAd+qyPeT6rgNUj8rdlTs5jTtoiIHJZK+NFm/TbPvBTKPr
-qew45B5pWm13j3BJmN0EhYIC32HR60/ef2hu2uBZEuyC2nCqofEHkKggLrb5867X
-DN3tnvJIn4KhSyW9nluEOmXEU82jQHmvD/6gbEvXyg7p0dTLi8dMwbbKhkWyrHlu
-lqvuJUvdDFv9X2k/y440cKhyssP5HlR/sXn+za5XQoPEtZIh9xM9sg0slSIq+eu1
-FRKS0Geo8e93L31jXn1GoNTSCIupyj3EZiKGE0xhxTmjoO+dEEVg6gTdYNAQd6Nx
-aaMdLRNo2hfk7ATA+L3hcfFSM+3QPg7wFCInGHQF/QKBgQD1aQ+GX6vl3lmZs+TX
-6Hp7qtL6g+TJ2/fSXqbMURHBtdTFFzROqtzIAHwp30fGCGG9reAmRZVHv2mF7U49
-3qk9/TcK4nUsGq/o87RKjmrUmLrEx1mtJK10BuJW2lEPIBG6Ws9tGAwSzhs5Lw5H
-LnbQHD4dftjhqhNX8ZoU5oG7dwKBgQDG3MwqaMQ55sh8+ci6tZ4pOm1/8Lin0gyh
-iNFa8UxFkTsaLHnDXrsUJCkqRwtNtV4Fhbv7x+4smGxDzuJkF6U7uxONJgWp1qlW
-6B0SBgKUPdxeGJYG4+ww9qsapARZzZ/1GLYv47+kPs0slz+A0OHeNs1BKhGJLK23
-P88MSG8BywKBgFnLs26Lmy5lCYwAEwAdhJOzkbcwg4qI/kjvcUDZeRHUIqJrNyyB
-wH8+DjCUDoMblgf9k0Ltuw2hsE7c4gApdOvFt1o4On+E1FD8uz98lQJtUAmol9uO
-zBjkW/VDtN0/8rypdbSJVAGdgMCPwz2wdrD3ZJMOUvVfcex/7s0u+tFJAoGAJoPb
-ExepcaFuES57nxXP5SJI1O+1g+NdyOdrzNZRNGQVc1NL3ff5+cOrKWILIWjQJfep
-2fD2AzMePN/T3xjpSrFH7x1/GU7XC1r3TmdVloqIpLzUSc9ZDn6n0wgTQ6Vcpqa7
-mnjcxB3ZtRoyFWvfYx9wD3/rV4sMtiIoorNgtJMCgYABDGH571InLE9HMO1+Czmp
-zyvcbTAq8GiN0G4Rok95+THfa726N6BcmkZUK1xWaleO6xNGrDsBghfmgw629Ujk
-UJ73ERYyATbA4GHM9f3dbje8pd2SFa4xF+0Xp09qY380aJrZSWsklBZPUmYiU6+W
-i2MlHfF+44rBO9igkUjQKA==
------END PRIVATE KEY-----)";
+    R"(-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIDBUDCgCQBYv0gfDoEg8366jUkUCpsfPhCM751mhkPc6oAoGCCqGSM49
+AwEHoUQDQgAE4RR0GJUrETmm9qgTMhvrgqDyQrbyrwJvkQCWTf7vpRM9gBt6BWzO
+uIMX39ic8T1m+SHWmwECtSwDUNN7unaJyA==
+-----END EC PRIVATE KEY-----)";
 const std::string pub_key_a =
     R"(-----BEGIN PUBLIC KEY-----
-MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvqLsA6WDlgxMjJyYcHoz
-p/m6A8cOJ7Yjkd5EcyADbia2xD391CRS/kjz882OzVNQOlz8/zQHHG7353O/HY9d
-q7FerLeRrhcfUG8WJ9l0G/L58Y/g4b0qzZPqsuyDGjf9zRqwKFnpkiESFlQe8W1c
-m0MrwLnIGkwyp1O9r4jTsaoPL+WxhflrU4ysHs5mLckPGe3aRkGzC9bZExEME6uZ
-5y63vBf7en00uM4hlcO0k4IEq6AB2s6Yc2JqnN1uvI2P0kHnzopQC8MxafwsaLm4
-9Hfn9zmE+Y53zD0qSiYmDZS6sQiTxozXEkcY880bf3EWM4QD364jv35GBrUHCzQe
-XQIDAQAB
+MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE4RR0GJUrETmm9qgTMhvrgqDyQrby
+rwJvkQCWTf7vpRM9gBt6BWzOuIMX39ic8T1m+SHWmwECtSwDUNN7unaJyA==
 -----END PUBLIC KEY-----)";
 
 const std::string priv_key_b =
-    R"(-----BEGIN PRIVATE KEY-----
-MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQCYq8QNOXZRoAid
-R7cKE9byr+9WekPMNDNkaKTjRUoXj8lUgno3y5tIDEIqhcv4thTLAxzQD4N+bVA3
-XF1ZMfm2GmM0O61AtpKwL6diBeGpCTunwzl9nrTeackQmwqRwllc3kW/npudNn12
-M9m4wsgLK98juyY6pZAeTlAvmVkMnFGoyv60jQciWvCFSYkpv2zxAOrmiCjgeYhU
-+d8B64qqWmnvdeLl8XGdBYN6nz+vWtWNDi/YuoGI2qhcuiikKvk0Ofmxx3+s4NHS
-DqdFfv3CbA5BFBLaHnFHVn+jocEgafOWUjruYcwrUcZuCr8Oy8KLqz6w5Xta/B7x
-0Lyx3zvHAgMBAAECggEADQw5ACxWCVnVAqQbZ5gUeb9BhDGE09HuRnmPBgFo+KSI
-P1m7WkNjbP/nM70llobxNfx5HOsGgOqUvXZ+X94eikqtCczD3ND9rmMUOhNomsq4
-N3k+05aZvJxr26h0ecqTWpWAfoTupbv/cvexdtHmyNWiB2q6NK7rpztoLPk9HA+q
-OzVH/qFbtqr1cQJijyrow97A/Yi2f3Kvp7irlLbH0QxxF9jPW/KDn2FIzycoFUtq
-NfuXkUpRkVA82lOyL80uYfQmNkM5/nKJxCTdUtSvA58a2jUC8xVH372kSKikTh6o
-clIR8vnvp2aFOrlyz3WfZGZgTo8/MuXP69aujwNgQQKBgQDItvqbcmHjWLIEuheS
-ahwIlFFhRR24ytsoRm1HVytBa+tmm56WjPV4chutrEz6IjPd8AvICwpQfCu17iUn
-7HM5a0hMctFtVxYuHGnMszD1KpgEByPnv59pPnTbvhqlnRpNR1aM2KVxAXAKSOgY
-8u+FA3c4wgUpA3z0l7Db33CUJwKBgQDCuRG8+8+HbQdMmct2+YbId/LSyvnoa9uS
-LYXn0WboCOZkEv0KxTjfn2wuLn0WaGG44ucvaFE4hDa7d6cIgrpBLD04rS8xSwa7
-uEQeRrThIn7Gv/RpcTxk0TASIEN2zIi18OV0Wx92wTTv34omFxZLPit9UgiCJM7i
-nAFUD6K/YQKBgC33geNRyctIR9S/TaCxfmQUm6KcMpdcld5eaq547yYXchzYrPQr
-qhgAggg/Oo3agWhljj0tEhqmpVgQByBijWzr/e3MKdxRonnC9hP0QdUUASaDAB0W
-DIsMy7R7kBy3owtpuA+fmhwMST2Bvu3fzSz4QziTbp0a+GYHy3A/dsfnAoGAPYiK
-SHQyopMbqWM4XsJ/iz4MZ/xoeMAMxObJ1/XeVRjq5VjyycKFNHWGlBlwwfH+X5Sk
-heCrOfbd7OPkztWw0gOO3SgtL6CL4iparE6fvj1OXrQuIlv8P8ezLycu6o277fLQ
-L7LUAI0Rk3PKjjrheqmMyK9xrN7A2e9+o/fE8EECgYAx3IziYqFfD4KzgmcM6MKx
-t4/SVFXBRLzse8AB3V6qSEwgCaUfeuj0Qq93nrkTIodHFWXuFoQTgQrA29VWbK6x
-PSwjdVNwYES+Hg+LbXP8Fo+u5sGhcWLzWdmFp3UdUm5Mv76Oo+MriZNnS4RQiX0+
-Y8PiIt3YYCsowmchtEggaQ==
------END PRIVATE KEY-----)";
+    R"(-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIFBc4fpIgmZAuQJobeCxN+51C4V33FbW3hOoB8ycXbJsoAoGCCqGSM49
+AwEHoUQDQgAErkFbtgVLcHVN0dj9E6apaP9GEYl+i9lSL6Y9VQPfOOt8vl7T9WUv
+qG+iL+euugvvsKyPEOBjmWxlyQZUoVevhg==
+-----END EC PRIVATE KEY-----)";
 const std::string pub_key_b =
     R"(-----BEGIN PUBLIC KEY-----
-MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAmKvEDTl2UaAInUe3ChPW
-8q/vVnpDzDQzZGik40VKF4/JVIJ6N8ubSAxCKoXL+LYUywMc0A+Dfm1QN1xdWTH5
-thpjNDutQLaSsC+nYgXhqQk7p8M5fZ603mnJEJsKkcJZXN5Fv56bnTZ9djPZuMLI
-CyvfI7smOqWQHk5QL5lZDJxRqMr+tI0HIlrwhUmJKb9s8QDq5ogo4HmIVPnfAeuK
-qlpp73Xi5fFxnQWDep8/r1rVjQ4v2LqBiNqoXLoopCr5NDn5scd/rODR0g6nRX79
-wmwOQRQS2h5xR1Z/o6HBIGnzllI67mHMK1HGbgq/DsvCi6s+sOV7Wvwe8dC8sd87
-xwIDAQAB
+MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAErkFbtgVLcHVN0dj9E6apaP9GEYl+
+i9lSL6Y9VQPfOOt8vl7T9WUvqG+iL+euugvvsKyPEOBjmWxlyQZUoVevhg==
 -----END PUBLIC KEY-----)";
 
 using time_T = std::chrono::time_point<std::chrono::system_clock>;
@@ -112,6 +56,19 @@ TEST(TokenTest, SimpleTwoWay)
     EXPECT_TRUE(valid);
 }
 
+TEST(TokenTest, SimpleTwoWayWithOtherKey)
+{
+    const std::string username = "james";
+    const time_T now = std::chrono::system_clock::now();
+    const time_T expire = now + std::chrono::seconds(1);
+
+    const auto token = gen_token(username, pub_key_b, priv_key_b, now, expire);
+
+    const bool valid = validate(token, username, pub_key_b);
+
+    EXPECT_TRUE(valid);
+}
+
 TEST(TokenTest, InvalidUsername)
 {
     const std::string username = "james";