diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 7b44815..1bb5223 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -182,6 +182,7 @@
     SSL_CTX_set_options(ssl->ctx, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
 #endif
 
+    SSL_CTX_set_options(ssl->ctx, SSL_OP_SINGLE_DH_USE);
 
     if (ngx_ssl_protocols[protocols >> 1] != 0) {
         SSL_CTX_set_options(ssl->ctx, ngx_ssl_protocols[protocols >> 1]);
@@ -352,6 +353,89 @@
 
 
 ngx_int_t
+ngx_ssl_dhparam(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *file)
+{
+    DH   *dh;
+    BIO  *bio;
+
+    /*
+     * -----BEGIN DH PARAMETERS-----
+     * MIGHAoGBALu8LcrYRnSQfEP89YDpz9vZWKP1aLQtSwju1OsPs1BMbAMCducQgAxc
+     * y7qokiYUxb7spWWl/fHSh6K8BJvmd4Bg6RqSp1fjBI9osHb302zI8pul34HcLKcl
+     * 7OZicMyaUDXYzs7vnqAnSmOrHlj6/UmI0PZdFGdX2gcd8EXP4WubAgEC
+     * -----END DH PARAMETERS-----
+     */
+
+    static unsigned char dh1024_p[] = {
+        0xBB, 0xBC, 0x2D, 0xCA, 0xD8, 0x46, 0x74, 0x90, 0x7C, 0x43, 0xFC, 0xF5,
+        0x80, 0xE9, 0xCF, 0xDB, 0xD9, 0x58, 0xA3, 0xF5, 0x68, 0xB4, 0x2D, 0x4B,
+        0x08, 0xEE, 0xD4, 0xEB, 0x0F, 0xB3, 0x50, 0x4C, 0x6C, 0x03, 0x02, 0x76,
+        0xE7, 0x10, 0x80, 0x0C, 0x5C, 0xCB, 0xBA, 0xA8, 0x92, 0x26, 0x14, 0xC5,
+        0xBE, 0xEC, 0xA5, 0x65, 0xA5, 0xFD, 0xF1, 0xD2, 0x87, 0xA2, 0xBC, 0x04,
+        0x9B, 0xE6, 0x77, 0x80, 0x60, 0xE9, 0x1A, 0x92, 0xA7, 0x57, 0xE3, 0x04,
+        0x8F, 0x68, 0xB0, 0x76, 0xF7, 0xD3, 0x6C, 0xC8, 0xF2, 0x9B, 0xA5, 0xDF,
+        0x81, 0xDC, 0x2C, 0xA7, 0x25, 0xEC, 0xE6, 0x62, 0x70, 0xCC, 0x9A, 0x50,
+        0x35, 0xD8, 0xCE, 0xCE, 0xEF, 0x9E, 0xA0, 0x27, 0x4A, 0x63, 0xAB, 0x1E,
+        0x58, 0xFA, 0xFD, 0x49, 0x88, 0xD0, 0xF6, 0x5D, 0x14, 0x67, 0x57, 0xDA,
+        0x07, 0x1D, 0xF0, 0x45, 0xCF, 0xE1, 0x6B, 0x9B
+    };
+
+    static unsigned char dh1024_g[] = { 0x02 };
+
+
+    if (file->len == 0) {
+
+        dh = DH_new();
+        if (dh == NULL) {
+            ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0, "DH_new() failed");
+            return NGX_ERROR;
+        }
+
+        dh->p = BN_bin2bn(dh1024_p, sizeof(dh1024_p), NULL);
+        dh->g = BN_bin2bn(dh1024_g, sizeof(dh1024_g), NULL);
+
+        if (dh->p == NULL || dh->g == NULL) {
+            ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0, "BN_bin2bn() failed");
+            DH_free(dh);
+            return NGX_ERROR;
+        }
+
+        SSL_CTX_set_tmp_dh(ssl->ctx, dh);
+
+        DH_free(dh);
+
+        return NGX_OK;
+    }
+
+    if (ngx_conf_full_name(cf->cycle, file, 1) == NGX_ERROR) {
+        return NGX_ERROR;
+    }
+
+    bio = BIO_new_file((char *) file->data, "r");
+    if (bio == NULL) {
+        ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
+                      "BIO_new_file(\"%s\") failed", file->data);
+        return NGX_ERROR;
+    }
+
+    dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
+    if (dh == NULL) {
+        ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
+                      "PEM_read_bio_DHparams(\"%s\") failed", file->data);
+        BIO_free(bio);
+        return NGX_ERROR;
+    }
+
+    SSL_CTX_set_tmp_dh(ssl->ctx, dh);
+
+    DH_free(dh);
+    BIO_free(bio);
+
+    return NGX_OK;
+}
+
+
+ngx_int_t
 ngx_ssl_create_connection(ngx_ssl_t *ssl, ngx_connection_t *c, ngx_uint_t flags)
 {
     ngx_ssl_connection_t  *sc;
diff --git a/src/event/ngx_event_openssl.h b/src/event/ngx_event_openssl.h
index 4c3dd48..6da568e 100644
--- a/src/event/ngx_event_openssl.h
+++ b/src/event/ngx_event_openssl.h
@@ -101,6 +101,7 @@
 ngx_int_t ngx_ssl_client_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl,
     ngx_str_t *cert, ngx_int_t depth);
 ngx_int_t ngx_ssl_generate_rsa512_key(ngx_ssl_t *ssl);
+ngx_int_t ngx_ssl_dhparam(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *file);
 ngx_int_t ngx_ssl_session_cache(ngx_ssl_t *ssl, ngx_str_t *sess_ctx,
     ssize_t builtin_session_cache, ngx_shm_zone_t *shm_zone, time_t timeout);
 ngx_int_t ngx_ssl_create_connection(ngx_ssl_t *ssl, ngx_connection_t *c,
diff --git a/src/http/modules/ngx_http_ssl_module.c b/src/http/modules/ngx_http_ssl_module.c
index ea9ff8f..cb81518 100644
--- a/src/http/modules/ngx_http_ssl_module.c
+++ b/src/http/modules/ngx_http_ssl_module.c
@@ -72,6 +72,13 @@
       offsetof(ngx_http_ssl_srv_conf_t, certificate_key),
       NULL },
 
+    { ngx_string("ssl_dhparam"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_str_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_ssl_srv_conf_t, dhparam),
+      NULL },
+
     { ngx_string("ssl_protocols"),
       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_1MORE,
       ngx_conf_set_bitmask_slot,
@@ -287,12 +294,10 @@
      * set by ngx_pcalloc():
      *
      *     sscf->protocols = 0;
-     *     sscf->certificate.len = 0;
-     *     sscf->certificate.data = NULL;
-     *     sscf->certificate_key.len = 0;
-     *     sscf->certificate_key.data = NULL;
-     *     sscf->client_certificate.len = 0;
-     *     sscf->client_certificate.data = NULL;
+     *     sscf->certificate = { 0, NULL };
+     *     sscf->certificate_key = { 0, NULL };
+     *     sscf->dhparam = { 0, NULL };
+     *     sscf->client_certificate = { 0, NULL };
      *     sscf->ciphers.len = 0;
      *     sscf->ciphers.data = NULL;
      *     sscf->shm_zone = NULL;
@@ -342,6 +347,8 @@
     ngx_conf_merge_str_value(conf->certificate_key, prev->certificate_key,
                          NGX_DEFLAUT_CERTIFICATE_KEY);
 
+    ngx_conf_merge_str_value(conf->dhparam, prev->dhparam, "");
+
     ngx_conf_merge_str_value(conf->client_certificate, prev->client_certificate,
                          "");
 
@@ -414,6 +421,10 @@
         return NGX_CONF_ERROR;
     }
 
+    if (ngx_ssl_dhparam(cf, &conf->ssl, &conf->dhparam) != NGX_OK) {
+        return NGX_CONF_ERROR;
+    }
+
     ngx_conf_merge_value(conf->builtin_session_cache,
                          prev->builtin_session_cache, NGX_SSL_NONE_SCACHE);
 
diff --git a/src/http/modules/ngx_http_ssl_module.h b/src/http/modules/ngx_http_ssl_module.h
index 1ef1ffe..74bf6e5 100644
--- a/src/http/modules/ngx_http_ssl_module.h
+++ b/src/http/modules/ngx_http_ssl_module.h
@@ -31,6 +31,7 @@
 
     ngx_str_t                       certificate;
     ngx_str_t                       certificate_key;
+    ngx_str_t                       dhparam;
     ngx_str_t                       client_certificate;
 
     ngx_str_t                       ciphers;
diff --git a/src/mail/ngx_mail_ssl_module.c b/src/mail/ngx_mail_ssl_module.c
index a387e59..c64d48c 100644
--- a/src/mail/ngx_mail_ssl_module.c
+++ b/src/mail/ngx_mail_ssl_module.c
@@ -76,6 +76,13 @@
       offsetof(ngx_mail_ssl_conf_t, certificate_key),
       NULL },
 
+    { ngx_string("ssl_dhparam"),
+      NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_str_slot,
+      NGX_MAIL_SRV_CONF_OFFSET,
+      offsetof(ngx_mail_ssl_conf_t, dhparam),
+      NULL },
+
     { ngx_string("ssl_protocols"),
       NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
       ngx_conf_set_bitmask_slot,
@@ -163,10 +170,9 @@
      * set by ngx_pcalloc():
      *
      *     scf->protocols = 0;
-     *     scf->certificate.len = 0;
-     *     scf->certificate.data = NULL;
-     *     scf->certificate_key.len = 0;
-     *     scf->certificate_key.data = NULL;
+     *     scf->certificate = { 0, NULL };
+     *     scf->certificate_key = { 0, NULL };
+     *     scf->dhparam = { 0, NULL };
      *     scf->ciphers.len = 0;
      *     scf->ciphers.data = NULL;
      *     scf->shm_zone = NULL;
@@ -213,6 +219,8 @@
     ngx_conf_merge_str_value(conf->certificate_key, prev->certificate_key,
                          NGX_DEFLAUT_CERTIFICATE_KEY);
 
+    ngx_conf_merge_str_value(conf->dhparam, prev->dhparam, "");
+
     ngx_conf_merge_str_value(conf->ciphers, prev->ciphers, NGX_DEFLAUT_CIPHERS);
 
 
@@ -260,6 +268,10 @@
         return NGX_CONF_ERROR;
     }
 
+    if (ngx_ssl_dhparam(cf, &conf->ssl, &conf->dhparam) != NGX_OK) {
+        return NGX_CONF_ERROR;
+    }
+
     ngx_conf_merge_value(conf->builtin_session_cache,
                          prev->builtin_session_cache, NGX_SSL_NONE_SCACHE);
 
diff --git a/src/mail/ngx_mail_ssl_module.h b/src/mail/ngx_mail_ssl_module.h
index c69e618..b8d2bdf 100644
--- a/src/mail/ngx_mail_ssl_module.h
+++ b/src/mail/ngx_mail_ssl_module.h
@@ -34,6 +34,7 @@
 
     ngx_str_t        certificate;
     ngx_str_t        certificate_key;
+    ngx_str_t        dhparam;
 
     ngx_str_t        ciphers;