Cipher Challenge
The Jacksonville Digraph Telegram
Introduction
A telegram sent from Jacksonville to George P. Raney on 16 November 1876 enciphered its main body as 120 two-letter groups. The clear closing sentence and signature are not included in the payload. Federal cryptanalysis
1
PP YY EM NS NY YY PI MA SH NS YY SS IT EP AA EN SH NS PE NS SH NS MM PI YY
26
SN PP YE AA PI EI SS YE SH AI NS SS PE EI YY SH NY NS SS YE PI AA NY IT NS
51
SH YY SP YY PI NS YY SS IT EM EI PI MM EI SS EI YY EI SS IT EI EP YY PE EI
76
AA SS IM AA YE SP NS YY IA NS SS EI SS MM PP NS PI NS SN PI NS IM IM YY IT
101
EM YY SS PE YY MM NS YY SS IT SP YY PE EP PP MA AA YY PI IT