Talk:Playfair cipher
Inadequate spec
How should one encode a sentence containing "xxx"? Or should the implementation crash for that case? --Rdm (talk) 05:04, 28 May 2014 (UTC)
The REXX program handles these two examples (below) without problems.
Note the ( [left parenthesis] is used to parse the plaintext from any specified options.
output when using the input of: ( I like XXX better than XX beer.
old cipher key: Playfair example. ◄───using the default. new cipher key: PLAYFIREXM omit char: J double char: X original text: I like XXX better then XX beer. cleansed text: IL IK EX XX BE TT ER TH EN XX BE ER ILIKEXXXBETTERTHENXXBEER encrypted text: RP BT XM MM MM DI WI VI IU DM QR MM DI MX EM RPBTXMMMMMDIWIVIIUDMQRMMDIMXEM plain text: IL IK EX XX XX BE TX TE RT HE NX XX BE XE RX ILIKEXXXXXBETXTERTHENXXXBEXERX possible text: IL IK EX XX BE TT ER TH EN XX BE ER ILIKEXXXBETTERTHENXXBEER original text: ILIKEXXXBETTERTHENXXBEER ════════════════Playfair encryption──► decryption──► encryption worked.
output when the input is: (triple xxx is like, thirty, dude. No XXXX though. Bummer.
old cipher key: Playfair example. ◄───using the default. new cipher key: PLAYFIREXM omit char: J double char: X original text: triple xxx is like, thirty, dude. No XXXX though. Bummer. cleansed text: TR IP LE XX XI SL IK ET HI RT YD UD EN OX XX XT HO UG HB UM ME R TRIPLEXXXISLIKETHIRTYDUDENOXXXXTHOUGHBUMMER encrypted text: UI BI AR MM MM MR NF BT IV BM IU AG VC RO QE MM MM MM ZB NV HB CT IM IX EM UIBIARMMMMMRNFBTIVBMIUAGVCROQEMMMMMMZBNVHBCTIMIXEM plain text: TR IP LE XX XX XI SL IK ET HI RT YD UD EN OX XX XX XX TH OU GH BU MX ME RX TRIPLEXXXXXISLIKETHIRTYDUDENOXXXXXXXTHOUGHBUMXMERX possible text: TR IP LE XX XI SL IK ET HI RT YD UD EN OX XX XT HO UG HB UM ME R TRIPLEXXXISLIKETHIRTYDUDENOXXXXTHOUGHBUMMER original text: TRIPLEXXXISLIKETHIRTYDUDENOXXXXTHOUGHBUMMER ════════════════Playfair encryption──► decryption──► encryption worked.