Fix a side-channel attack on data-dependent timing variations in modular exponentiation, which can potentially lead to an information leak. Fix a side-channel attack which can potentially lead to an information leak. Libgcrypt before 1.5.4, as used in GnuPG and other products, does not properly perform ciphertext normalization and ciphertext randomization, which makes it easier for physically proximate attackers to conduct key-extraction attacks by leveraging the ability to collect voltage data from exposed metal, a different vector than CVE-2013-4576 , which was fixed in ALAS-2014-278