diff --git a/src/main.cpp b/src/main.cpp
index e5fcd02..e6ea752 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -33,6 +33,9 @@
 #include "ec.h"
 #include "key_search.h"
 
+// Command line options.
+bool option_l33t = false;
+
 #ifdef HAVE_THREADS
 #define n_thread_decl int n_threads = std::thread::hardware_concurrency()
 #define n_thread_argv 				\
@@ -56,10 +59,19 @@ void cmd_search(int argc, char **argv) {
 	int n = 100;
 	n_thread_decl;
 	std::string search(argv[0]);
-	strlist_t words = strsplitwords(strtolower(search));
+	strlist_t words;
 
-	// Strip words from non-base58.
-	base58_strip(words);
+	if (option_l33t) {
+		strlist_t tmp = strsplitwords(search);
+		for(int i = 0; i < tmp.size(); i++) {
+			strlist_t list = l33twords(base58_strip(tmp[i]));
+			words.reserve(words.size() + list.size());
+			words.insert(words.end(), list.begin(), list.end());
+		}
+	} else {
+		words = strsplitwords(strtolower(search));
+		base58_strip(words);
+	}
 
 	if (argc > 1) {
 		n = atoi(argv[1]);
@@ -71,7 +83,7 @@ void cmd_search(int argc, char **argv) {
 	n_thread_argv;
 
 	std::cout << "Searching for " << n
-		<< " keys containing: " << search
+		<< " keys containing: " << strjoin(words, ",")
 		n_thread_outp
 		<< std::endl;
 
@@ -108,6 +120,12 @@ int main(int argc, char **argv) {
 			return 0;
 		}
 
+		if (!strcmp(argv[1], "--l33t")) {
+			option_l33t = true;
+			argc--;
+			argv = &argv[1];
+		}
+
 		if (!strcmp(argv[1], "search")) {
 			if (argc < 3) {
 				std::cout << "You must specify a word list." << std::endl;
diff --git a/src/string.cpp b/src/string.cpp
index 91b0960..a90388b 100644
--- a/src/string.cpp
+++ b/src/string.cpp
@@ -46,6 +46,21 @@ strlist_t strsplit(const std::string& str, const std::string& delim) {
 	return r;
 }
 
+std::string strjoin(const strlist_t& list, const std::string& delim) {
+
+	std::string out;
+
+	for(const std::string& item : list) {
+		out += item + delim;
+	}
+
+	if (out.length() > 0) {
+		out.erase(out.end() - delim.length());
+	}
+
+	return out;
+}
+
 std::string& strtolower(std::string& str) {
 	std::transform(str.begin(), str.end(), str.begin(), [](unsigned char c){ return std::tolower(c); });
 	return str;
@@ -84,3 +99,52 @@ strlist_t& base58_strip(strlist_t& list) {
 	std::transform(list.begin(), list.end(), list.begin(), [](std::string& str){ return base58_strip(str); });
 	return list;
 }
+
+static bool is_l33t(char ch, char& r) {
+
+	//                          '1', '2', '3', '4', '5', '6', '7', '8', '9'
+	static char alphabet[9] = { 'l', 'z', 'e', 'a', 's', 'G', 't', 'B', 'g' };
+
+	for(int i = 0; i < sizeof(alphabet) / sizeof(char); i++) {
+
+		if (ch == alphabet[i]) {
+			r = '1' + i;
+			return true;
+		}
+	}
+	return false;
+}
+
+static void _l33t(strlist_t& list, const std::string& a, int pos) {
+
+	// Find the next character to be replaced.
+	for(int i = pos; i < a.length(); i++) {
+
+		char ch;
+		if (is_l33t(a[i], ch)) {
+			// create a new string and replace the character.
+			std::string b = a;
+			b[i] = ch;
+
+			// Store the new string as the result.
+			list.push_back(b);
+
+			// Perform the same algorithm for both strings
+			// at the next position.
+			_l33t(list, a, i + 1);
+			_l33t(list, b, i + 1);
+			break;
+		}
+	}
+}
+
+strlist_t l33twords(const std::string& str) {
+
+	strlist_t list;
+
+	// Store the original string as the first in list.
+	list.push_back(str);
+
+	_l33t(list, str, 0);
+	return list;
+}
diff --git a/src/string.h b/src/string.h
index e364fed..d006579 100644
--- a/src/string.h
+++ b/src/string.h
@@ -33,6 +33,8 @@ strlist_t strsplitwords(const std::string& str, const std::string& delim = ",");
 
 strlist_t strsplit(const std::string& str, const std::string& delim);
 
+std::string strjoin(const strlist_t& list, const std::string& delim);
+
 std::string& strtolower(std::string& str);
 
 std::string& rtrim(std::string& str);
@@ -42,4 +44,6 @@ std::string& trim(std::string& str);
 std::string& base58_strip(std::string &str);
 strlist_t& base58_strip(strlist_t& list);
 
+strlist_t l33twords(const std::string& str);
+
 #endif /* STRING_H */