diff --git a/cipherscan b/cipherscan
index eb91255..2aef6e4 100755
--- a/cipherscan
+++ b/cipherscan
@@ -30,6 +30,27 @@ ALLCIPHERS=0
 OUTPUTFORMAT="terminal"
 TIMEOUT=10
 
+# Error codes
+E_MISSING_OPENSSL_PARAMETERS=113 # When we have valid cipherscan options, but are missing any parameters to pass to OpenSSL.
+ERROR_MESSAGE[$E_MISSING_OPENSSL_PARAMETERS]="Missing any OpenSSL parameters"
+
+E_OPENSSL_NOT_FOUND=112 # Cound't find the specified OpenSSL binary.
+ERROR_MESSAGE[$E_OPENSSL_NOT_FOUND]="openssl not found"
+
+E_OPENSSL_NOT_EXECUTABLE=111 # Specified OpenSSL has been found but is not executable for user.
+ERROR_MESSAGE[$E_OPENSSL_NOT_EXECUTABLE]="openssl not executable"
+
+function error_exit {
+    local ERRORCODE=$1
+    echo verbose=$VERBOSE
+    echo debug=$DEBUG
+    if [ $VERBOSE -gt 0 ] || [ $DEBUG -gt 0 ]; then
+        if [ -n $ERROR_MESSAGE[$ERRORCODE] ]; then
+            echo "${ERROR_MESSAGE[$ERRORCODE]}" >&2
+        fi
+    fi
+    exit $ERRORCODE
+}
 
 usage() {
     echo -e "usage: $0 [-a|--allciphers] [-b|--benchmark] [-d|--delay seconds] [-D|--debug] [-j|--json] [-v|--verbose] [-o|--openssl file] [openssl s_client args] <target:port>
@@ -364,6 +385,21 @@ do
     esac
 done
 
+# Check OpenSSL
+if [ ! -x "$OPENSSLBIN" ]; then
+    # openssl does not exist || is not executable
+    if [ -a "$OPENSSLBIN" ]; then
+        # openssl does exist, but is not executable
+        error_exit $E_OPENSSL_NOT_EXECUTABLE
+    else
+        # openssl does not exist
+        error_exit $E_OPENSSL_NOT_FOUND
+    fi
+# else
+    # File exists and IS executable
+fi
+
+
 if [ $VERBOSE != 0 ] ; then
     [ -n "$CACERTS" ] && echo "Using trust anchors from $CACERTS"
     echo "Loading $($OPENSSLBIN ciphers -v $CIPHERSUITE 2>/dev/null|grep Kx|wc -l) ciphersuites from $(echo -n $($OPENSSLBIN version 2>/dev/null))"
@@ -371,6 +407,13 @@ if [ $VERBOSE != 0 ] ; then
 fi
 
 # echo paramters left: $@
+# Testing for existence of OpenSSL parameters
+if [ -z "$1" ]; then
+
+ usage
+ error_exit $E_MISSING_OPENSSL_PARAMETERS
+fi
+
 
 TEMPTARGET=$(sed -e 's/^.* //'<<<"${@}")
 HOST=$(sed -e 's/:.*//'<<<"${TEMPTARGET}")