Transposition Cipher. Suppose we want to encrypt the following message: “Now run along and don't get into.

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Presentation transcript:

Transposition Cipher

Suppose we want to encrypt the following message: “Now run along and don't get into mischief, I'm going out.” from “Peter Rabbit” by Beatrix Potter

Start by removing the punctuation and the spaces between the words: nowrunalonganddontget intomischiefimgoingout

Add 4 extra padding characters at the end, to take the message up to 48 characters: nowrunalonganddontgetin tomischiefimgoingoutxxxx

Write this message in 4 rows, each 12 letters long: nowrunalonga nddontgetint omischiefiam goingoutxxxx

Read the letters in order down the columns, instead of along the rows: nowrunalonga nddontgetint omischiefiam goingoutxxxx nnogodmowdiiroshuncgntho agiuleetotfxniixgnaxatmx

Suppose the enemy intercepts and wants to decipher our message. What might they do?

48 characters can be encoded using grids of one of these dimensions: 1×4848×1 2×2424×2 3×1616×3 4×1212×4 6×88×6

n nogodmowdiirosnuncgntho a giuleetotfxniIxgnaxatmx 1×48 doesn't rearrange the message at all. 2×24 gives: Reading down the columns gives "nangoigu...."

Next we try a 3×16 grid. And then a 4×12 grid. And then …

n nog o dmo w dii r osn u ncg n tho a giu l eet o tfx n iIx g nax a tmx Eventually we get to the 12×4 grid. This time, reading down the columns gives us the original message!