=== Vigenère + Row/Column tranposition ===

*KE/003* (Keith Edkins 2004-Feb-23)

Reversed Complete Columnar Transpositions

(http://www.cryptogram.org/cdb/aca.info/aca.and.you/chap08.html#COMPLE) for all permutations up to length 8, allowing for the fact that the long columns should be on the left after reversing the permutation. (46230 permutations).

Progressed any with IC >= 0.06 for any key length 3-12 (1024 passed this test).

Ran wordlist Vigenère for words of length matching best IC (or factors of it), using KRYPTOS alphabets as in sections 1 & 2.

Grading results on occurence of singles, digrams and trigrams. Repeated with plain alphabets

No interesting results.

---- === Vigenère + periodic sampling ===

KE/002* (Keith Edkins 2004-Feb-23)

Rearranged string by taking every mth letter starting from n, all m & n. Progressed any with IC >= 0.06 for any key length 3-12 (130 passed this test). Ran wordlist Vigenère for all words of length matching best IC (or factors of it), using KRYPTOS alphabets as in sections 1 & 2. Grading results on occurence of singles, digrams and trigrams. Repeated with plain alphabets. No interesting results.

----

=== Vigenère + local permutation ===

Message 115 Computer program to do transposition followed by substitution. (Gary Warzin)

Message 117 Transposition sampling every 68 characters. (Ferdinando Stehle)

---- Back to Section Four Attempts

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