Oechslin提出的彩虹表应用时间空间折中思想,是密码学中逆转单向函数的有效工具,但现在广泛使用的单一字符集彩虹表,在明文位数较大时,因明文空间的迅速膨胀,消耗计算资源的迅速增加,其应用遇到了瓶颈。为此,针对人为口令字符集构成特点,提出分段式字符集彩虹表明文生成方式,将取自不同字符集的不同位数明文拼接组成新的明文,可以有效地压缩明文空间,增加覆盖的最大明文位数。对取自CSDN的1000个真实口令哈希进行实验,结果表明,在原始彩虹表的基础上,使用分段式字符集彩虹表使恢复成功率提升39.1%。 Oechslin proposed rainbow table time and space compromise idea is an effective tool to reverse the one-way function in cryptography, but now widely used single character set rainbow table, when the plaintext median is large, due to the rapid expansion of plaintext space, Consumption of computing resources increased rapidly, its application has encountered a bottleneck. Therefore, in view of the characteristics of human password character set, a segmented character set rainbow is proposed to show the way of text generation. Different numbers of bits from different character sets are plaintextly spliced ​​to form a new plaintext, which can effectively compress the plaintext space and increase the coverage The largest number of plain text. Experiments on 1000 real password hashes collected from CSDN show that based on the original rainbow table, the use of the segmented character set rainbow table improves the recovery success rate by 39.1%.