The ninth official hint for Challenge 10B
The Empty Vault › Forums › Bureau of Security and Signals Intelligence Forum › The official Challenge 10 tips and hints thread › The ninth official hint for Challenge 10B
3rd January 2023 at 9:00 am
#87592
Harry
Keymaster
The ninth official hint for Challenge 10B
As with part A, your best cribs is probably BENJAMIN TALLMADGE.
Lay this out in rows of length 5 to match the keyword length
| B | E | N | J | A |
| M | I | N | T | A |
| L | L | M | A | D |
| G | E |
The structure of the Cadenus cipher means that, up to a rollover between the top and bottom of a column and a permutation of the columns, you should be able to find these columns in the cipher text.That should be enough to suggest the shifts used in each column AND the permutation of the columns themselves.