diff -up openssh-5.6p1/audit-bsm.c.audit4 openssh-5.6p1/audit-bsm.c
--- openssh-5.6p1/audit-bsm.c.audit4	2011-01-12 10:48:20.000000000 +0100
+++ openssh-5.6p1/audit-bsm.c	2011-01-12 10:48:54.000000000 +0100
@@ -395,4 +395,10 @@ audit_kex_body(int ctos, char *enc, char
 {
 	/* not implemented */
 }
+
+void
+audit_session_key_free_body(int ctos)
+{
+	/* not implemented */
+}
 #endif /* BSM */
diff -up openssh-5.6p1/audit.c.audit4 openssh-5.6p1/audit.c
--- openssh-5.6p1/audit.c.audit4	2011-01-12 10:45:58.000000000 +0100
+++ openssh-5.6p1/audit.c	2011-01-12 10:51:16.000000000 +0100
@@ -152,6 +152,12 @@ audit_kex(int ctos, char *enc, char *mac
 	PRIVSEP(audit_kex_body(ctos, enc, mac, comp));
 }
 
+void
+audit_session_key_free(int ctos)
+{
+	PRIVSEP(audit_session_key_free_body(ctos));
+}
+
 # ifndef CUSTOM_SSH_AUDIT_EVENTS
 /*
  * Null implementations of audit functions.
@@ -254,5 +260,13 @@ audit_kex_body(int ctos, char *enc, char
 	debug("audit procol negotiation euid %d direction %d cipher %s mac %s compresion %s",
 		geteuid(), ctos, enc, mac, compress);
 }
+
+/*
+ * This will be called on succesfull session key discard
+ */
+audit_session_key_free_body(int ctos)
+{
+	debug("audit session key discard euid %d direction %d", geteuid(), ctos);
+}
 # endif  /* !defined CUSTOM_SSH_AUDIT_EVENTS */
 #endif /* SSH_AUDIT_EVENTS */
diff -up openssh-5.6p1/audit.h.audit4 openssh-5.6p1/audit.h
--- openssh-5.6p1/audit.h.audit4	2011-01-12 10:45:58.000000000 +0100
+++ openssh-5.6p1/audit.h	2011-01-12 10:45:59.000000000 +0100
@@ -60,5 +60,7 @@ void	audit_unsupported(int);
 void	audit_kex(int, char *, char *, char *);
 void	audit_unsupported_body(int);
 void	audit_kex_body(int, char *, char *, char *);
+void	audit_session_key_free(int ctos);
+void	audit_session_key_free_body(int ctos);
 
 #endif /* _SSH_AUDIT_H */
diff -up openssh-5.6p1/audit-linux.c.audit4 openssh-5.6p1/audit-linux.c
--- openssh-5.6p1/audit-linux.c.audit4	2011-01-12 10:45:58.000000000 +0100
+++ openssh-5.6p1/audit-linux.c	2011-01-12 10:48:00.000000000 +0100
@@ -174,13 +174,14 @@ audit_unsupported_body(int what)
 #endif
 }
 
+const static char *direction[] = { "from-server", "from-client", "both" };
+
 void
 audit_kex_body(int ctos, char *enc, char *mac, char *compress)
 {
 #ifdef AUDIT_CRYPTO_SESSION
 	char buf[AUDIT_LOG_SIZE];
 	int audit_fd, audit_ok;
-	const static char *direction[] = { "from-server", "from-client", "both" };
 	Cipher *cipher = cipher_by_name(enc);
 
 	snprintf(buf, sizeof(buf), "start direction=%s cipher=%s, ksize=%d rport=%d laddr=%s lport=%d",
@@ -203,4 +204,22 @@ audit_kex_body(int ctos, char *enc, char
 #endif
 }
 
+void
+audit_session_key_free_body(int ctos)
+{
+	char buf[AUDIT_LOG_SIZE];
+	int audit_fd, audit_ok;
+
+	snprintf(buf, sizeof(buf), "destroy kind=session direction=%s", direction[ctos]);
+	audit_fd = audit_open();
+	if (audit_fd < 0) 
+		return;
+	audit_ok = audit_log_acct_message(audit_fd, AUDIT_CRYPTO_KEY_USER, NULL,
+			buf, NULL, -1, NULL, get_remote_ipaddr(), NULL, 1);
+	audit_close(audit_fd);
+	/* do not abort if the error is EPERM and sshd is run as non root user */
+	if ((audit_ok < 0) && ((audit_ok != -1) || (getuid() == 0)))
+		error("cannot write into audit");
+}
+
 #endif /* USE_LINUX_AUDIT */
diff -up openssh-5.6p1/auditstub.c.audit4 openssh-5.6p1/auditstub.c
--- openssh-5.6p1/auditstub.c.audit4	2011-01-12 10:45:58.000000000 +0100
+++ openssh-5.6p1/auditstub.c	2011-01-12 10:45:59.000000000 +0100
@@ -37,3 +37,7 @@ audit_kex(int ctos, char *enc, char *mac
 {
 }
 
+void
+audit_session_key_free(int ctos)
+{
+}
diff -up openssh-5.6p1/monitor.c.audit4 openssh-5.6p1/monitor.c
--- openssh-5.6p1/monitor.c.audit4	2011-01-12 10:45:59.000000000 +0100
+++ openssh-5.6p1/monitor.c	2011-01-12 10:45:59.000000000 +0100
@@ -180,6 +180,7 @@ int mm_answer_audit_event(int, Buffer *)
 int mm_answer_audit_command(int, Buffer *);
 int mm_answer_audit_unsupported_body(int, Buffer *);
 int mm_answer_audit_kex_body(int, Buffer *);
+int mm_answer_audit_session_key_free_body(int, Buffer *);
 #endif
 
 static Authctxt *authctxt;
@@ -230,6 +231,7 @@ struct mon_table mon_dispatch_proto20[] 
     {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
     {MONITOR_REQ_AUDIT_UNSUPPORTED, MON_PERMIT, mm_answer_audit_unsupported_body},
     {MONITOR_REQ_AUDIT_KEX, MON_PERMIT, mm_answer_audit_kex_body},
+    {MONITOR_REQ_AUDIT_SESSION_KEY_FREE, MON_PERMIT, mm_answer_audit_session_key_free_body},
 #endif
 #ifdef BSD_AUTH
     {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
@@ -268,6 +270,7 @@ struct mon_table mon_dispatch_postauth20
     {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
     {MONITOR_REQ_AUDIT_UNSUPPORTED, MON_PERMIT, mm_answer_audit_unsupported_body},
     {MONITOR_REQ_AUDIT_KEX, MON_PERMIT, mm_answer_audit_kex_body},
+    {MONITOR_REQ_AUDIT_SESSION_KEY_FREE, MON_PERMIT, mm_answer_audit_session_key_free_body},
 #endif
     {0, 0, NULL}
 };
@@ -301,6 +304,7 @@ struct mon_table mon_dispatch_proto15[] 
     {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
     {MONITOR_REQ_AUDIT_UNSUPPORTED, MON_PERMIT, mm_answer_audit_unsupported_body},
     {MONITOR_REQ_AUDIT_KEX, MON_PERMIT, mm_answer_audit_kex_body},
+    {MONITOR_REQ_AUDIT_SESSION_KEY_FREE, MON_PERMIT, mm_answer_audit_session_key_free_body},
 #endif
     {0, 0, NULL}
 };
@@ -314,6 +318,7 @@ struct mon_table mon_dispatch_postauth15
     {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command},
     {MONITOR_REQ_AUDIT_UNSUPPORTED, MON_PERMIT, mm_answer_audit_unsupported_body},
     {MONITOR_REQ_AUDIT_KEX, MON_PERMIT, mm_answer_audit_kex_body},
+    {MONITOR_REQ_AUDIT_SESSION_KEY_FREE, MON_PERMIT, mm_answer_audit_session_key_free_body},
 #endif
     {0, 0, NULL}
 };
@@ -2252,4 +2257,18 @@ mm_answer_audit_kex_body(int sock, Buffe
 	return 0;
 }
 
+int
+mm_answer_audit_session_key_free_body(int sock, Buffer *m)
+{
+	int ctos;
+
+	ctos = buffer_get_int(m);
+
+	audit_session_key_free_body(ctos);
+
+	buffer_clear(m);
+
+	mm_request_send(sock, MONITOR_ANS_AUDIT_SESSION_KEY_FREE, m);
+	return 0;
+}
 #endif /* SSH_AUDIT_EVENTS */
diff -up openssh-5.6p1/monitor.h.audit4 openssh-5.6p1/monitor.h
--- openssh-5.6p1/monitor.h.audit4	2011-01-12 10:45:59.000000000 +0100
+++ openssh-5.6p1/monitor.h	2011-01-12 10:45:59.000000000 +0100
@@ -68,6 +68,7 @@ enum monitor_reqtype {
 	MONITOR_REQ_JPAKE_CHECK_CONFIRM, MONITOR_ANS_JPAKE_CHECK_CONFIRM,
 	MONITOR_REQ_AUDIT_UNSUPPORTED, MONITOR_ANS_AUDIT_UNSUPPORTED,
 	MONITOR_REQ_AUDIT_KEX, MONITOR_ANS_AUDIT_KEX,
+	MONITOR_REQ_AUDIT_SESSION_KEY_FREE, MONITOR_ANS_AUDIT_SESSION_KEY_FREE,
 };
 
 struct mm_master;
diff -up openssh-5.6p1/monitor_wrap.c.audit4 openssh-5.6p1/monitor_wrap.c
--- openssh-5.6p1/monitor_wrap.c.audit4	2011-01-12 10:45:59.000000000 +0100
+++ openssh-5.6p1/monitor_wrap.c	2011-01-12 10:45:59.000000000 +0100
@@ -1445,4 +1445,17 @@ mm_audit_kex_body(int ctos, char *cipher
 
 	buffer_free(&m);
 }
+
+void
+mm_audit_session_key_free_body(int ctos)
+{
+	Buffer m;
+
+	buffer_init(&m);
+	buffer_put_int(&m, ctos);
+	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_SESSION_KEY_FREE, &m);
+	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUDIT_SESSION_KEY_FREE,
+				  &m);
+	buffer_free(&m);
+}
 #endif /* SSH_AUDIT_EVENTS */
diff -up openssh-5.6p1/monitor_wrap.h.audit4 openssh-5.6p1/monitor_wrap.h
--- openssh-5.6p1/monitor_wrap.h.audit4	2011-01-12 10:45:59.000000000 +0100
+++ openssh-5.6p1/monitor_wrap.h	2011-01-12 10:45:59.000000000 +0100
@@ -76,6 +76,7 @@ void mm_audit_event(ssh_audit_event_t);
 void mm_audit_run_command(const char *);
 void mm_audit_unsupported_body(int);
 void mm_audit_kex_body(int, char *, char *, char *);
+void mm_audit_session_key_free_body(int);
 #endif
 
 struct Session;
diff -up openssh-5.6p1/packet.c.audit4 openssh-5.6p1/packet.c
--- openssh-5.6p1/packet.c.audit4	2010-07-16 05:58:37.000000000 +0200
+++ openssh-5.6p1/packet.c	2011-01-12 10:45:59.000000000 +0100
@@ -495,6 +495,7 @@ packet_close(void)
 		buffer_free(&active_state->compression_buffer);
 		buffer_compress_uninit();
 	}
+	audit_session_key_free(2);
 	cipher_cleanup(&active_state->send_context);
 	cipher_cleanup(&active_state->receive_context);
 }
@@ -749,6 +750,7 @@ set_newkeys(int mode)
 	}
 	if (active_state->newkeys[mode] != NULL) {
 		debug("set_newkeys: rekeying");
+		audit_session_key_free(mode);
 		cipher_cleanup(cc);
 		enc  = &active_state->newkeys[mode]->enc;
 		mac  = &active_state->newkeys[mode]->mac;