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+Secure Remote Password
+========================================
+
+The library contains an implementation of the :wikipedia:`SRP-6a
+password based key exchange protocol
+<Secure_remote_password_protocol>` in ``srp6.h``.
+
+A SRP client provides what is called a SRP *verifier* to the server.
+This verifier is based on a password, but the password cannot be
+easily derived from the verifier. Later, the client and server can
+perform an SRP exchange, in which
+
+ .. warning::
+
+     While knowledge of the verifier does not easily allow an attacker
+     to get the raw password, they could still use the verifier to
+     impersonate the server to the client, so verifiers should be
+     carefully protected.
+
+
+.. cpp:function:: BigInt generate_srp6_verifier( \
+          const std::string& identifier, \
+          const std::string& password, \
+          const std::vector<byte>& salt, \
+          const std::string& group_id, \
+          const std::string& hash_id)
+
+
+.. cpp:function:: std::pair<BigInt,SymmetricKey> srp6_client_agree( \
+               const std::string& username, \
+               const std::string& password, \
+               const std::string& group_id, \
+               const std::string& hash_id, \
+               const std::vector<byte>& salt, \
+               const BigInt& B, \
+               RandomNumberGenerator& rng)
+
+.. cpp:function:: std::string srp6_group_identifier( \
+            const BigInt& N, const BigInt& g)