John the Ripper is a fast password cracker, currently available for many flavors of Unix, Windows, DOS, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords. It supports several crypt(3) password hash types commonly found on Unix systems, as well as Windows LM hashes.
What is new in John the Ripper 1.7.8 :-
The bitslice DES S-box expressions have been replaced with those generated by Roman Rusakov specifically for John the Ripper. The corresponding assembly
code for x86 with MMX, SSE2, and for x86-64 with SSE2 has been re-generated. For other CPUs and for AVX/XOP, C compilers do a reasonably good job of generating the code from the supplied C source files (with intrinsics where relevant). The S-box expressions that we were using before had a 21% larger gate count, so theoretically this could provide a 21% speedup. In practice, though, a 12% to 14% speedup at DES-based crypt(3) hashes is typical. This effort has been sponsored by Rapid7
Corrected support for bcrypt (OpenBSD Blowfish) hashes of passwords containing non-ASCII characters (that is, characters with the 8th bit set). Added support for such hashes produced by crypt_blowfish up to 1.0.4, which contained a sign extension bug (inherited from older versions of John). The old buggy behavior may be enabled per-hash, using the “$2x$” prefix.
The external mode virtual machine’s performance has been improved through additional multi-op instructions matching common instruction sequences
(assign-pop and some triple- and quad-push VM instructions were added).
A few minor bug fixes and enhancements were made.
This release comes with an 17% improvement in gate count for the Data Encryption Standard (DES) algorithm by generating different S-box expressions targeting both typical CPUs with only basic instructions and CPUs/GPUs that have “bit select” instructions.
Download John the Ripper v1.7.8 HERE
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