[ntpsec commit] Remove a useless reference to NTPv3.

[Eric S. Raymond]

Module:    ntpsec
Branch:    master
Commit:    f9756aae6346e94752ec089d09ecfe1eb6572b6e
Changeset: http://git.ntpsec.org/ntpsec/commit/?id=f9756aae6346e94752ec089d09ecfe1eb6572b6e

Author:    Eric S. Raymond <esr at thyrsus.com>
Date:      Mon Oct 12 08:47:33 2015 -0400

Remove a useless reference to NTPv3.

---

 docs/authentic.txt | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/docs/authentic.txt b/docs/authentic.txt
index e121b57..eb473fe 100644
--- a/docs/authentic.txt
+++ b/docs/authentic.txt
@@ -316,15 +316,13 @@ contain the value _trustRoot_;. Other extension fields are ignored.
 [[algorithms]]
 == Algorithms ==
 
-The NTPv3 specification (RFC-1305) defined an authentication scheme
-properly described as _symmetric key cryptography_. It used the Data
-Encryption Standard (DES) algorithm operating in cipher-block chaining
-(CBC) mode. Subsequently, this algorithm was replaced by the RSA Message
-Digest 5 (MD5) algorithm commonly called keyed-MD5. Either algorithm
-computes a message digest or one-way hash which can be used to verify
-the client has the same message digest as the server. The MD5 message
-digest algorithm is included in the distribution, so without further
-cryptographic support, the distribution can be freely exported.
+The NTP standards include symmetric (private-key) authentication using
+the RSA Message Digest 5 (MD5) algorithm commonly ,called
+keyed-MD5. This algorithm computes a message digest or one-way hash
+which can be used to verify the client has the same message digest as
+the server. The MD5 message digest algorithm is included in the
+distribution, so without further cryptographic support, the
+distribution can be freely exported.
 
 If the OpenSSL cryptographic library is installed prior to building the
 distribution, all message digest algorithms included in the library may