Reply To: Stuff to do while you wait (with a message from Harry added)

[madness]

Here, I reencoded your plaintext with an actual homophonic substitution. The key is quite simple. But see if you can tell the difference.

4LH ENSNSJ YUUR MZ UI A IBNYQ9 QBYJF 15C5YCBS KV51G CHQVSJMTJ 3V A WYV0WGYU51 RAT5IBD45YFY M3 LBZ A JVUE ZVQNE I5YTN25YH VI 3LH WHYNVE 3LF JFSGYBQ GIIHD4 M1 B Z5CZ2BS4NAQ ASE KFA6MQ9 DVRIUY4BCQG C53 TV3 DV09 ATE LURHQMPH MI A YHAQM03ND 1G3 MZ 51GE 3LFT M2 0KU5QE CF Z75TJ CADP B1 N2 7AZ MS 4KH WYVE5D4NVS B4 2LG SF7 4KHB3YG C9 EVNTJ 4KNZ 9V5 DBS LB6H 4KF EMSNS J3ACQF DGT4YG EU7S13BJG E5YMTJ AD2 UTH 7LHT M3 N1 TFGEFE 3KHYG ATE 2KHS 17MSJMSJ CADP DAT YG6HBQ 4LG IMYFWQADF IUY AD4 37V BSE 2LHS IVY AD2 2KYHG DAT 0KU7 B 1RBQQ 2BCQF 7M2L B 2GQHWLVSH US M3 EU7T03AJF UI 2LF IMYFWQADF BTE C9 2KMZ 4MRF 3LH EMTNTJ2BCQH BSE N3 DKANY1 KA6G RU6FE 7HQQ 5W02AJG WYUE5DFYZ 7KU 7MZK 2U B6UME 2LM1 3YNDP9 C50MSHZ1 7LMDL NT6UQ6H1 27V YFZH32NSJZ VI 3KF ZDFTF ASE 0URH 6HY9 BDD5YA3H BEO514RHT4Z UI 3KH F84YB IQA31 TGDG1ZBY9 7V5QE CG 7FQQ BE6M1HE 3V ENZWFS1G 7N2L BS UYEMTBY9 YFBQN04ND 1F4 MI UTQ9 CGDA50H 4LG ENSMTJ2BCQH CGDVRF1 A S5M0BTDF 2LH QMJK3MTJ ZKV5QE CF WMSP BTE NT2MRA2F 5S3NQ 2KG NS0WGD4VY BYYN6F1 BSE 2LHS M3 0KU5QE CG CYNJK4HY BSE LBYEFY

The 3rd challenge at the end of Simon Singh’s The Code Book is also homophonic, but not in English.