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-rw-r--r--src/block/des/des.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/block/des/des.cpp b/src/block/des/des.cpp
index 739dfe87c..c500e9bab 100644
--- a/src/block/des/des.cpp
+++ b/src/block/des/des.cpp
@@ -2,6 +2,9 @@
* DES
* (C) 1999-2008 Jack Lloyd
*
+* Based on a public domain implemenation by Phil Karn (who in turn
+* credited Richard Outerbridge and Jim Gillogly)
+*
* Distributed under the terms of the Botan license
*/