US Patent 11177933 Side channel timing attack mitigation in securing data in transit

A method for side-channel attack mitigation in streaming encryption includes reading into a decryption process executing in memory of a computer, an input stream and extracting from the input stream both an encryption envelope and cipher text and extracting from the encryption envelope, a wrapped key. Then, decryption may be performed in constant time of the cipher text using one of two different keys, a first for authenticated decryption comprising the wrapped key, and a second for unauthenticated encryption comprising a dummy key, with no difference in timing of execution regardless of which of the two different keys are utilized during decryption of the cipher text.