For this week, I’ve decided to use a 95-year-old cipher employed by the German army during the First World War. You have the advantage, however, of the far greater computing power available today.
FFXGDXXDG VVAFVXDDA DAVAXDFXG DVDAAAXFV AFAVGVVDV XGDXVXGAX AFDAVXADA GDFVFDAFF AXDDAFFVG DGDDDXDAD GAXVGFXAA DAFFFGXFV XAAXAFFAG VXDVFDVVA AGDVGXVAX DDFFVADFD FDAAADAAV AXVAAXDFV VXADVDAAV GDXDXAGFF VVAXVFXVV AGDAFXDVX DVAVDDXAV VAFVVXAAA FXVDVFFVA VAVDFDDVD VDVDAAAAV DGGXFDAFX DFXVVXADD ADDAAVXGF GVAAGDFAD AAVXFDGDG XFVGADFGD AVXXVVVVV XDVDAFDAD VAXVAXVVD GVAAVXXVV XVXXDVAAX AFVAAXFXG GXAVFDVFA VDVVGDFAV XAXXAXAVG VVVXAAGVV ADDXDVVVF VFVAVXXVG DAXAFGAFD DDVGDFXGV FFFFDVVAG VVVAGGXVA DAXFDAGFA VDAVDXAAA AVFXAVAVV XDVVVADVA ADDFVADVA FADAADFDV AGXVDVAVD FXADAFFVG GVDFDAGXF GFAADDXDV GDADGXXDD XFVVAVXGA VGXDXGVVD XDGDDFFVX AXADXVAGV VDAVVVAAV VVFXXVADV XDAXGFAVV DAFFXVDFV FFGDXFADV AGFDVAAAF DAADAFXAV VAVVFDAVD FVXVVXXAA DVXXAVAFA ADAXAAXVG VVFFFGXAV XAAAADFAG DVVFFDGFX AVVVADFAD DDVVFDAAF ADDAVAAAA ADDXAVAVA DXDVGXDVV DVFDFAAFV FVDXAVFGD VADFDGDVG DVVVGXFAD DVFDVVAFF VFVADVDXV AVAADAAXV AXVAAGDVA ADVXDAAXD
I’ve also used the same key for both the transposition and substitution stages.