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-rw-r--r--doc/crypto/des_modes.pod4
1 files changed, 2 insertions, 2 deletions
diff --git a/doc/crypto/des_modes.pod b/doc/crypto/des_modes.pod
index 36b77c454d..da75e8007d 100644
--- a/doc/crypto/des_modes.pod
+++ b/doc/crypto/des_modes.pod
@@ -204,8 +204,8 @@ just one key.
=item *
If the first and last key are the same, the key length is 112 bits.
-There are attacks that could reduce the key space to 55 bit's but it
-requires 2^56 blocks of memory.
+There are attacks that could reduce the effective key strength
+to only slightly more than 56 bits, but these require a lot of memory.
=item *