John the Ripper 特别善于查看弱密码，通过搜索常见密码列表查找匹配。它不像那些商用软件或Ophcrack那样擅长强密码，但是它工作在很多地方工作良好，比如当用户选了一个易 于记忆的密码。 新版本改进记录： 1. OpenMP parallelization of MD5-crypt and bitslice DES has been added.
2. DES key setup has been reworked. x86-64 assembly code for DES S-boxes has been optimized.
3. Support for DES-based tripcodes has been added.
4. Larger hash table sizes for faster processing of millions of hashes per salt have been added.
5. Detection of Intel AVX and AMD XOP with fallback to an alternate program binary has been added.
6. Fallback to a non-OpenMP build has been added.
7. A benchmark result comparison tool has been added.
8. The bundled common passwords list has been updated. Many minor enhancements and a few bugfixes were made | 
