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diff --git a/src/rps/gnunet-service-rps_sampler_elem.h b/src/rps/gnunet-service-rps_sampler_elem.h
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+/*
+     This file is part of GNUnet.
+     Copyright (C)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+     Boston, MA 02110-1301, USA.
+*/
+
+/**
+ * @file rps/gnunet-service-rps_sampler_elem.h
+ * @brief sampler element implementation
+ * @author Julius Bünger
+ */
+
+#ifndef RPS_SAMPLER_ELEM_H
+#define RPS_SAMPLER_ELEM_H
+#include <inttypes.h>
+
+
+/***********************************************************************
+ * WARNING: This section needs to be reviewed regarding the use of
+ * functions providing (pseudo)randomness!
+ ***********************************************************************/
+
+/**
+ * Used to indicate whether a sampler element is empty.
+ */
+enum RPS_SamplerEmpty
+{
+  NOT_EMPTY = 0x0,
+  EMPTY = 0x1
+};
+
+/**
+ * A sampler element sampling one PeerID at a time.
+ */
+struct RPS_SamplerElement
+{
+  /**
+   * Min-wise linear permutation used by this sampler.
+   *
+   * This is an key later used by a hmac.
+   */
+  struct GNUNET_CRYPTO_AuthKey auth_key;
+
+  /**
+   * The PeerID this sampler currently samples.
+   */
+  struct GNUNET_PeerIdentity peer_id;
+
+  /**
+   * The according hash value of this PeerID.
+   */
+  struct GNUNET_HashCode peer_id_hash;
+
+
+  /**
+   * Time of last request.
+   */
+  struct GNUNET_TIME_Absolute last_client_request;
+
+  /**
+   * Flag that indicates that we are not holding a valid PeerID right now.
+   */
+  enum RPS_SamplerEmpty is_empty;
+
+  /**
+   * 'Birth'
+   */
+  struct GNUNET_TIME_Absolute birth;
+
+  /**
+   * How many times a PeerID was put in this sampler.
+   */
+  uint32_t num_peers;
+
+  /**
+   * How many times this sampler changed the peer_id.
+   */
+  uint32_t num_change;
+
+  /**
+   * The file name this sampler element should log to
+   */
+  char *file_name;
+};
+
+
+/**
+ * Reinitialise a previously initialised sampler element.
+ *
+ * @param sampler pointer to the memory that keeps the value.
+ */
+void
+RPS_sampler_elem_reinit (struct RPS_SamplerElement *sampler_el);
+
+
+/**
+ * (Re)Initialise given Sampler with random min-wise independent function.
+ *
+ * In this implementation this means choosing an auth_key for later use in
+ * a hmac at random.
+ *
+ * @return a newly created RPS_SamplerElement which currently holds no id.
+ */
+struct RPS_SamplerElement *
+RPS_sampler_elem_create (void);
+
+
+/**
+ * Input an PeerID into the given sampler element.
+ *
+ * @param sampler the sampler the @a s_elem belongs to.
+ *                Needed to know the
+ */
+void
+RPS_sampler_elem_next (struct RPS_SamplerElement *s_elem,
+                       const struct GNUNET_PeerIdentity *new_ID);
+
+
+#endif /* RPS_SAMPLER_ELEM_H */
+/* end of gnunet-service-rps.c */