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This project forked from makomk/aeskeyfind
Fork of aeskeyfind that knows more formats of AES key schedule
License: Other
AESKeyFinder 1.0 (2008-07-18) By Nadia Heninger and Ariel Feldman This program illustrates automatic techniques for locating 128-bit and 256-bit AES keys in a captured memory image, as described in Section 6.1 of the research paper: J. A. Halderman, S. D. Schoen, N. Heninger, W. Clarkson, W. Paul, J. A. Calandrino, A. J. Feldman, J. Appelbaum, and E. W. Felten. "Lest We Remember: Cold-Boot Attacks on Encryption Keys." Proc. 17th USENIX Security Symposium (Sec '08), San Jose, CA, July 2008. For more information, see: http://citp.princeton.edu/memory/ The program uses the following algorithm: 1. Iterate through each byte of the memory image. Treat the following block of 176 or 240 bytes as an AES key schedule. 2. For each word in the potential key schedule, calculate the Hamming distance from that word to the key schedule word that should have been generated from the surrounding words. 3. If the total number of bits violating the constraints on a correct AES key schedule is sufficiently small, output the key. For efficiency, it also performs a simple entropy test to filter out blocks that are not keys. It counts the number of repeated bytes and skips blocks that have too many repeats. This method works even if several bits of the key schedule have been corrupted due to memory decay. This modified version of the original AESKeyFinder can additionally find key schedules whose entries are in reverse order or which have had InvMixColumn pre-applied for use by decryption code that uses this optimisation. (Currently only implemented for 128-bit keys.) USAGE: aeskeyfind [OPTION]... MEMORY-IMAGE Options: -v verbose output -- prints the extended keys and the constraints on the rows of the key schedule -q don't display a progress bar -t THRESHOLD sets the maximum number of bit errors allowed in a candidate key schedule -h displays usage help
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