官方网站：http://www.openwall.com/john/
下载：wget http://www.openwall.com/john/j/john-1.8.0.tar.gz
解压：tar -xvf john-1.8.0.tar.gz
进入src目录：
cd john-1.8.0 && cd src
root@ubuntu:/usr/local/john/john-1.8.0/src# make To build John the Ripper, type: make clean SYSTEM where SYSTEM can be one of the following: linux-x86-64-avx Linux, x86-64 with AVX (2011+ Intel CPUs) linux-x86-64-xop Linux, x86-64 with AVX and XOP (2011+ AMD CPUs) linux-x86-64 Linux, x86-64 with SSE2 (most common) linux-x86-avx Linux, x86 32-bit with AVX (2011+ Intel CPUs) linux-x86-xop Linux, x86 32-bit with AVX and XOP (2011+ AMD CPUs) linux-x86-sse2 Linux, x86 32-bit with SSE2 (most common, if 32-bit) linux-x86-mmx Linux, x86 32-bit with MMX (for old computers) linux-x86-any Linux, x86 32-bit (for truly ancient computers) linux-alpha Linux, Alpha linux-sparc Linux, SPARC 32-bit linux-ppc32-altivec Linux, PowerPC w/AltiVec (best) linux-ppc32 Linux, PowerPC 32-bit linux-ppc64 Linux, PowerPC 64-bit linux-ia64 Linux, IA-64 freebsd-x86-64 FreeBSD, x86-64 with SSE2 (best) freebsd-x86-sse2 FreeBSD, x86 with SSE2 (best if 32-bit) freebsd-x86-mmx FreeBSD, x86 with MMX freebsd-x86-any FreeBSD, x86 freebsd-alpha FreeBSD, Alpha openbsd-x86-64 OpenBSD, x86-64 with SSE2 (best) openbsd-x86-sse2 OpenBSD, x86 with SSE2 (best if 32-bit) openbsd-x86-mmx OpenBSD, x86 with MMX openbsd-x86-any OpenBSD, x86 openbsd-alpha OpenBSD, Alpha openbsd-sparc64 OpenBSD, SPARC 64-bit (best) openbsd-sparc OpenBSD, SPARC 32-bit openbsd-ppc32 OpenBSD, PowerPC 32-bit openbsd-ppc64 OpenBSD, PowerPC 64-bit openbsd-pa-risc OpenBSD, PA-RISC openbsd-vax OpenBSD, VAX netbsd-sparc64 NetBSD, SPARC 64-bit netbsd-vax NetBSD, VAX solaris-sparc64-cc Solaris, SPARC V9 64-bit, cc (best) solaris-sparc64-gcc Solaris, SPARC V9 64-bit, gcc solaris-sparcv9-cc Solaris, SPARC V9 32-bit, cc solaris-sparcv8-cc Solaris, SPARC V8 32-bit, cc solaris-sparc-gcc Solaris, SPARC 32-bit, gcc solaris-x86-64-cc Solaris, x86-64 with SSE2, cc (best) solaris-x86-64-gcc Solaris, x86-64 with SSE2, gcc solaris-x86-sse2-cc Solaris 9 4/04+, x86 with SSE2, cc solaris-x86-sse2-gcc Solaris 9 4/04+, x86 with SSE2, gcc solaris-x86-mmx-cc Solaris, x86 with MMX, cc solaris-x86-mmx-gcc Solaris, x86 with MMX, gcc solaris-x86-any-cc Solaris, x86, cc solaris-x86-any-gcc Solaris, x86, gcc sco-x86-any-gcc SCO, x86, gcc sco-x86-any-cc SCO, x86, cc tru64-alpha Tru64 (Digital UNIX, OSF/1), Alpha aix-ppc32 AIX, PowerPC 32-bit macosx-x86-64 Mac OS X 10.5+, Xcode 3.0+, x86-64 with SSE2 (best) macosx-x86-sse2 Mac OS X, x86 with SSE2 macosx-ppc32-altivec Mac OS X, PowerPC w/AltiVec (best) macosx-ppc32 Mac OS X, PowerPC 32-bit macosx-ppc64 Mac OS X 10.4+, PowerPC 64-bit macosx-universal Mac OS X, Universal Binary (x86 + x86-64 + PPC) hpux-pa-risc-gcc HP-UX, PA-RISC, gcc hpux-pa-risc-cc HP-UX, PA-RISC, ANSI cc irix-mips64-r10k IRIX, MIPS 64-bit (R10K) (best) irix-mips64 IRIX, MIPS 64-bit irix-mips32 IRIX, MIPS 32-bit dos-djgpp-x86-mmx DOS, DJGPP, x86 with MMX dos-djgpp-x86-any DOS, DJGPP, x86 win32-cygwin-x86-sse2 Win32, Cygwin, x86 with SSE2 (best) win32-cygwin-x86-mmx Win32, Cygwin, x86 with MMX win32-cygwin-x86-any Win32, Cygwin, x86 beos-x86-sse2 BeOS, x86 with SSE2 (best) beos-x86-mmx BeOS, x86 with MMX beos-x86-any BeOS, x86 generic Any other Unix-like system with gcc root@ubuntu:/usr/local/john/john-1.8.0/src#根据自己系统版本选择。make clean linux-x86-64
编译成功会在run目录下生成john可执行文件。
把想破解的/etc/shadow放在shadow.txt文件夹下：
执行：./john shadow.txt
但凡是暴力破解密码，都需要一个足够强悍的密码字典。
John the Ripper的默认密码字典为run目录下的password.lst。
而密码字典的构造就看自己收集信息的能力了。
