diff -urNp gnupg-2.0.4.org/g10/seckey-cert.c gnupg-2.0.4/g10/seckey-cert.c
--- gnupg-2.0.4.org/g10/seckey-cert.c	2006-11-21 10:26:13.000000000 +0200
+++ gnupg-2.0.4/g10/seckey-cert.c	2007-06-22 18:08:48.000000000 +0300
@@ -211,6 +211,11 @@ do_check( PKT_secret_key *sk, const char
                 csum += checksum (buffer, ndata);
                 gcry_mpi_release (sk->skey[i]);
 
+		if (sk->protect.algo==CIPHER_ALGO_IDEA) {
+			buffer[0] = 0;
+			buffer[1] = 0;
+		}
+
 		err = gcry_mpi_scan( &sk->skey[i], GCRYMPI_FMT_USG,
 				     buffer, ndata, &ndata );
 		xfree (buffer);