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This issue has been reported by Tuba Yavuz, Farhaan Fowze, Ken (Yihang) Bai, Grant Hernandez, and Kevin Butler (University of Florida) and Dave Tian (Purdue University). In AES encrypt and decrypt some variables were left on the stack. The value of these variables can be used to recover the last round key. To follow best practice and to limit the impact of buffer overread vulnerabilities (like Heartbleed) we need to zeroize them before exiting the function.