CAP Cryptographic Analysis Program Anagram Help Presentation Press Enter or click on your mouse button to continue

Use the mouse button to activate each presentation step 2 Breaking a Column Transposition Once you have a good estimate for the size of a column transposition you need to discover the correct arrangement of columns One tool that may help in this process in the Anagram tool provided by CAP  It allows you to try to arrange the columns to produce words  The place to begin is to look for rows that have letters that commonly belong together

Use the mouse button to activate each presentation step 3 Letter Affinity First, in all languages there are certain letters usually of medium or low frequency which combine with other letters to form diagrams of high frequency  H (medium frequency) combines with T to form TH (highest frequency)  H combines with C (medium frequency) to form CH  V (low frequency) combines with E to form VE (medium frequency in military text) Some possible RULES:  When there is an H, attempts should be made to combine it with a T or a C  A V should be combined first with an E  A K should be combined first with a C

Use the mouse button to activate each presentation step 4 Pilot Letters Second, there is usually in every language at least one letter which can be followed by only certain other letters forming an obligatory sequence or invariable digraph  Q is always followed by U  J can only be followed by a vowel  X can be preceded only by a vowel and except at the end of a word can only be succeeded by a vowel or C, H, P, T Letters such as these with limited affinity are called pilot letters

Use the mouse button to activate each presentation step 5 Centiban Scores For other possible letter pairs the Centiban table could be helpful  The US government studied a set of 5,000 digrams and produced a table of what are called centiban weights  This table contains the logarithm of twice the frequency of each digram A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Second Letter First LetterFirst Letter The higher the score the more likely the two letter should be paired