Definitely the last whitespace error in crypto.rst

Author: drbruced12

crypto.rst

@@ -429,7 +429,7 @@ reserved for use in authentication and session key establishment.
    today could be stored for a decade or two and then decrypted by a
    future quantum computer, so even data produced today could be at
    risk.
-   
+
    The response to this uncertain threat has been to develop suites of
    cryptographic algorithms for which no quantum solution is
    known. This is the field of "Post-Quantum Cryptography". Note the