A story which surfaced a few years ago, and met quite some success in the press and on the internet, pretended Cambridge University had been conducing research on some of the most amazing faculties of the human brain. According to a supposed study, the order in which letters were laid out when writing a word mattered very little, provided the first and last letter be kept in place : this conclusion was supported by a short excerpt of shuffled text, which anyone could easily decipher ((Matt Davis has a fascinating write-up on this. Snopes also has some reference material; the full text was something like Aoccdrnig to rscheearch at Cmabrigde uinervtisy, it deosn’t mttaer waht oredr the ltteers in a wrod are, the olny iprmoetnt tihng is taht the frist and lsat ltteres are at the rghit pclae. The rset can be a tatol mses and you can sitll raed it wouthit a porbelm. Tihs is bcuseae we do not raed ervey lteter by itslef but the wrod as a wlohe.)). As a short example, consider the following sentence:
Narlmloy, radneig tihs shdulon’t be too hrad.
As many commentators pointed out at the time, the trick works well because the words used are relatively short; the following passage should be much harder to understand:
The eofrft rureieqd to sfssllcceuuy dhiepecr sbecmrald pgsaases daiaarclltmy ianserecs as wdors get lehegtinr.
This article presents an efficient algorithm to unshuffle scrambled text.