Editing Transposition cipher (section)

=== Cryptanalysis ===

The double transposition cipher can be treated as a single transposition with a key as long as the product of the lengths of the two keys.<ref>{{cite book |last1=Barker |first1=Wayne |title=Cryptanalysis of the Double Transposition Cipher: Includes Problems and Computer Programs |date=1995 |publisher=Aegean Park Press}}</ref>

In late 2013, a double transposition challenge, regarded by its author as undecipherable, was solved by George Lasry using  a divide-and-conquer approach where each transposition was attacked individually.<ref>{{cite journal |first=George |last=Lasry |title=Solving the Double Transposition Challenge with a Divide-and-Conquer Approach |date=2014-06-13 |journal= Cryptologia|volume = 38|issue=3 |pages=197–214 |doi=10.1080/01611194.2014.915269 |s2cid=7946904 }}</ref>