Reply To: Extracurricular Challenges

Re: #98114

md5(“upsidedown” || encrypt(“IDECLARETHATIAMANELITECODECRAKER”)) = cdb9dcfbc86baec0c794345b4149a4ca

Here’s a similar cipher which uses a prefix code and extends the pattern of the key to produce a homophonic substitution:

60KE VX91 9689 5382 92Z8 580H 0KES 6948 0Q84 8968 3J84 V898 491L 3DSS LOV8
8949 480Q J849 1963 8091 DJ82 FSY7 XD3S 9594 VQ96 89X3 3809 1WW5 OGH5 SU80
G81S C828 9T03 J52H 9682 E808 8184 3ZM8 9808 1JD8 3E80 3FK8 2978 92ZE NTS8
9G80 G818 491L 88JX 3915 1SK8 8J82 LZ09 7XKS E823 D80H 92H8 40LX 82F2 9059
1D94 X81E SPG9 6QJV 66XE VGWM 8980 W948 8HN8 0GD9 4X1V 91DE 03PG L5O9 1889
4X83 X918 8EX5 K978 4U82 8938 8E82 82DV 88J8 4969 782X 9190 H52W JX96 8091
D584 M895 OGYE 26M9 2097 8491 L97N 88JX D89Z 95KV 83M2 88Z8 8X80 88JX 893V
9682 84G9 65GD JX94 8284 FX96 2F82 96W8 2Q59 5889 482K S588 90Z8 8JQV D3D8
092H H840 ZQ1J V888 2ZQO J82G VD95 82H9 2889 4828 1898 2NFZ 8782 TXGD JZLM
X829 183H 8284 91X9 684G 963Y E849 082L 9728 81ZQ QD80 H92L 8491 WX89 S23H
NQH8 0F90 8289 N3SD 9484 88DJ XEX1 8289 XKXO X89F 8433 8291 WX89 3D94 8491
PQPZ HVGL 82XL KE5T D94X L80E 8283 8880 591S KDJX TX88 ESF5 9280 88ZG 388Z
D805 G915 S918 2OZQ 835T VGW3 8487 82DJ XQ80 9181 92XW 8291 D928 2684 G1J5
382X Y838 2918 889V 83YS GLPY D94Z L96E ZOG6 0848 888X 9188 V5G

md5(lowercase plaintext) = 07ccad93115a2015c6537bf75099f98f