diff --git a/libsgx/sgx-remote-attest.c b/libsgx/sgx-remote-attest.c
index ab695d96..783924c1 100644
--- a/libsgx/sgx-remote-attest.c
+++ b/libsgx/sgx-remote-attest.c
@@ -187,7 +187,7 @@ int sgx_remote_attest_target(int challenger_port, int quote_port, char *conf)
     }
     puts("MAC match, PASS!");
 
-    //Send intra attestaion result to Quoting enclave
+    //Send intra attestation result to Quoting enclave
     puts("Sending result message to Quoting enclave ...");
     resultmsg = "Good";
     if(sgx_write_sock(quote_fd, resultmsg, strlen(resultmsg)) < 0) {
diff --git a/user/demo/simple-intra-attest-target.c b/user/demo/simple-intra-attest-target.c
index f4816e4b..767c9ea3 100644
--- a/user/demo/simple-intra-attest-target.c
+++ b/user/demo/simple-intra-attest-target.c
@@ -34,7 +34,7 @@ void enclave_main()
 
     ret = sgx_intra_attest_target(challenger_port);
     if(ret == 1) {
-        puts("Intra Attestaion Success!");
+        puts("Intra Attestation Success!");
     } else {
         puts("Intra Attestation Fail!");
     }
diff --git a/user/demo/simple-remote-attest-quote.c b/user/demo/simple-remote-attest-quote.c
index 6193b635..70685421 100644
--- a/user/demo/simple-remote-attest-quote.c
+++ b/user/demo/simple-remote-attest-quote.c
@@ -37,7 +37,7 @@ void enclave_main()
 
     ret = sgx_remote_attest_quote(target_port);
     if(ret == 1) {
-        puts("Remote Attestaion Success!");
+        puts("Remote Attestation Success!");
     } else {
         puts("Remote Attestation Fail!");
     }
diff --git a/user/test/simple-intra-attest-challenger.c b/user/test/simple-intra-attest-challenger.c
index 8538e14a..322a46a0 100644
--- a/user/test/simple-intra-attest-challenger.c
+++ b/user/test/simple-intra-attest-challenger.c
@@ -29,7 +29,7 @@ void enclave_main()
 
     ret = sgx_intra_attest_challenger(target_port, conf);
     if(ret == 1) {
-        puts("Intra Attestaion Success!");
+        puts("Intra Attestation Success!");
     } else {
         puts("Intra Attestation Fail!");
     }
diff --git a/user/test/simple-remote-attest-challenger.c b/user/test/simple-remote-attest-challenger.c
index f8878f4a..d40f5b59 100644
--- a/user/test/simple-remote-attest-challenger.c
+++ b/user/test/simple-remote-attest-challenger.c
@@ -33,7 +33,7 @@ void enclave_main()
 
     ret = sgx_remote_attest_challenger(target_ip, target_port, challenge);
     if(ret == 1) {
-        puts("Remote Attestaion Success!");
+        puts("Remote Attestation Success!");
     } else {
         puts("Remote Attestation Fail!");
     }
diff --git a/user/test/simple-remote-attest-target.c b/user/test/simple-remote-attest-target.c
index 0d291202..b8f2e34a 100644
--- a/user/test/simple-remote-attest-target.c
+++ b/user/test/simple-remote-attest-target.c
@@ -30,7 +30,7 @@ void enclave_main()
 
     ret = sgx_remote_attest_target(challenger_port, quote_port, conf);
     if(ret == 1) {
-        puts("Remote Attestaion Success!");
+        puts("Remote Attestation Success!");
     } else {
         puts("Remote Attestation Fail!");
     }