diff --git a/generator.cpp b/generator.cpp
index bc1b6d1..cbd6280 100644
--- a/generator.cpp
+++ b/generator.cpp
@@ -7,30 +7,30 @@ using namespace std;
 
 struct G_state{
 	long k;
-	long c;
+	long ctr;
 };
 
 G_state *initialize_generator(){
 	auto G = new G_state;
 	G->k = 0;
-	G->c = 0;
+	G->ctr = 0;
 	return G;
 };
 
-string do_crypto(long k, long c){
+string do_crypto(long k, long ctr){
 	/* this function calls the block cipher
 	   do whatever atm */
 	k = 0;
-	c = 0;
+	ctr = 0;
 	return "";
 }
 
 G_state generate_blocks(G_state G, int k_blocks){
-	assert (G.c!=0);
+	assert (G.ctr!=0);
 	string r = "";
 	for (int i = 0; i < k_blocks; ++i) {
-		r += do_crypto(G.k, G.c);
-		G.c += 1;
+		r += do_crypto(G.k, G.ctr);
+		G.ctr += 1;
 	}
 	return G;
 }
@@ -47,7 +47,7 @@ string generate_random_data(G_state G, uint n){
 	}
 	/* do magic to compute r
 	 * r ← first-n-bytes(GenerateBlocks(G, ceil(n/16) )) */
-	string rr = to_string(generate_blocks(G,ceil(n/16)).c);
+	string rr = to_string(generate_blocks(G,ceil(n/16)).ctr);
 	r = rr.substr(0,n);
 	return r;
 };
diff --git a/generator.h b/generator.h
index c549d89..7d0386e 100644
--- a/generator.h
+++ b/generator.h
@@ -9,7 +9,7 @@ struct G_state;
 /* initializes generator */
 G_state *initialize_generator();
 
-std::string do_crypto(long k, long c);
+std::string do_crypto(long k, long ctr);
 
 G_state generate_blocks(G_state G, int k_blocks);