I've decided to start a new feature, referring you all* to a new Web site that I think adds something valuable-ish to the Web in all its World Wideness. This week's feature: Rules of Thumb. It's kind of a fun assortment of reader-submitted tips to live by. A lot of them are not so great. Some of them are helpful. And still others are interesting even if they are irrelevant. I've never been all that in love with relevance, so I appreciate this one:
If the high-frequency letters ETOANIRSH occur very often, in this order, you can assume that you are dealing with a transposition cipher in which the letters remain the same but are rearranged in a new pattern. On the other hand, the repeated appearance of low-frequency letters indicates that a message has been written in a substitution code.
There are plenty of rules you can use, at least one for every thumb. So please, browse, enjoy, and tell me what you think.
*Or you both, as the case may be.