diff --git a/openbsc/include/openbsc/abis_rsl.h b/openbsc/include/openbsc/abis_rsl.h
index 6a454bf..8c5547d 100644
--- a/openbsc/include/openbsc/abis_rsl.h
+++ b/openbsc/include/openbsc/abis_rsl.h
@@ -499,6 +499,7 @@
 int rsl_chan_activate_lchan(struct gsm_lchan *lchan, u_int8_t act_type, 
 			    u_int8_t ta);
 int rsl_chan_mode_modify_req(struct gsm_lchan *ts);
+int rsl_encryption_cmd(struct msgb *msg);
 int rsl_paging_cmd(struct gsm_bts *bts, u_int8_t paging_group, u_int8_t len,
 		   u_int8_t *ms_ident, u_int8_t chan_needed);
 int rsl_paging_cmd_subscr(struct gsm_bts *bts, u_int8_t chan_needed,
diff --git a/openbsc/include/openbsc/gsm_04_08.h b/openbsc/include/openbsc/gsm_04_08.h
index 6f36786..99d7747 100644
--- a/openbsc/include/openbsc/gsm_04_08.h
+++ b/openbsc/include/openbsc/gsm_04_08.h
@@ -713,6 +713,7 @@
 int gsm48_mi_to_string(char *string, const int str_len, const u_int8_t *mi, const int mi_len);
 
 int gsm48_send_rr_release(struct gsm_lchan *lchan);
+int gsm48_send_rr_ciph_mode(struct gsm_lchan *lchan);
 int gsm48_send_rr_app_info(struct gsm_lchan *lchan, u_int8_t apdu_id,
 			   u_int8_t apdu_len, u_int8_t *apdu);
 
diff --git a/openbsc/include/openbsc/gsm_data.h b/openbsc/include/openbsc/gsm_data.h
index 4bdca2a..2658a79 100644
--- a/openbsc/include/openbsc/gsm_data.h
+++ b/openbsc/include/openbsc/gsm_data.h
@@ -126,6 +126,9 @@
 	int waiting_for_imei : 1;
 };
 
+#define MAX_A5_KEY_LEN	(128/8)
+#define RSL_ENC_ALG_A5(x)	(x+1)
+
 struct gsm_lchan {
 	/* The TS that we're part of */
 	struct gsm_bts_trx_ts *ts;
@@ -140,6 +143,12 @@
 	/* Power levels for MS and BTS */
 	u_int8_t bs_power;
 	u_int8_t ms_power;
+	/* Encryption information */
+	struct {
+		u_int8_t alg_id;
+		u_int8_t key_len;
+		u_int8_t key[MAX_A5_KEY_LEN];
+	} encr;
 	
 	/* To whom we are allocated at the moment */
 	struct gsm_subscriber *subscr;