diff -U4 -r ppp-2.4.4/pppd/chap-new.c ppp-2.4.4+chaphide/pppd/chap-new.c
--- ppp-2.4.4/pppd/chap-new.c	2005-07-13 11:41:58.000000000 +0100
+++ ppp-2.4.4+chaphide/pppd/chap-new.c	2009-06-22 20:16:38.000000000 +0100
@@ -599,9 +599,12 @@
 		nlen = len - clen - 1;
 		printer(arg, " <");
 		for (; clen > 0; --clen) {
 			GETCHAR(x, p);
-			printer(arg, "%.2x", x);
+			if (code == CHAP_RESPONSE)
+				printer(arg, "xx");
+			else
+				printer(arg, "%.2x", x);
 		}
 		printer(arg, ">, name = ");
 		print_string((char *)p, nlen, printer, arg);
 		break;