Mob of the Dead Unsolved Secret Mystery Codes Surface

Black Ops 2's Mob of the Dead map is hiding a series of codes encrypted in some form of cryptographic cipher that may be impossible to figure out without a key.

These codes were discovered by keen-eyed players, including ninjacart on reddit, and detailed captures (seen below) were put online by the TypicalGamer channel on YouTube.

Each code was discovered in a prison cell, the locations of which can be found in the video below:

Ninjacart suggests that the cipher used to encrypt the codes may be polyalphabetic, suggesting what exactly? Who knows.

Here are the codes as they are, line by line, should anyone care to figure out what they say:

CODE #1

04M0L.CZGL9EI1?-RAL81,5-88JRD?J5-6.?T7OKZO?M9KRXOBALUJHJTQML4E P.BGMSS3NN52TL9.190A7PHZ871RN9,FBKK7HZYNVG?ZMTU_CW8,IZMAF5Y1N 7346HR9_AC-GY5JQ-4,5FBHJD16KJ11AM85ZUZ_JEM873AAPQBLMJ56FG?P5, _C1ESTUU,G-G9WMB9V_ZNYHH9B8H8LC6NC175,2DUE.MG2XXPWWWW,S5VPP SUMVN3SDWG_QAYWSWG5TQDYWFP799O-RN3ZUGY-H-3THIBUC1RWAWBMYEI V_67T7F6P7U9-G1FAD2R4Q87EN0ZRU,_BPRF_XM9A03?CM2YQS0BIRL30KYA 36E2WJM

CODE #2

J.W-ON8G,CEY2UX1D,K52GU05S5,K?DP.P?-418Q9.CHOUR08?TVO1-SQOPAS 3ALRX576ZA-1MQP.E6ZOMOC8IF4S,2Z68-I_CPL39PF-5MJ?GWQJ1NCGPG7L- ?QOIVRB1NP0V3,2ME__AEHWWUE4UH83UIN_V75IIZBGI2XX72ZRAOMURGR-0 FJSDPT-KV.7L3NWD66RO6KBK,6GKP6B7_F?M,6HWS2MUO2IP9SHP,Q0YXBM KCP1U1,W?S101S1VD.NAFW9Z0FXGX6NG28.UAJLK6FU218RTFMF_OO.UK3JRC S._77Y7W?OH5U9JY1LY4AEC0EQ9Z0L85TDX84DKFM8BFUD4VGDICZ9

CODE #3

G.R9PXXV.M??65FI8FYOUCHLYWLF5Q3EL42HA81DJX95RJ_Q7I?,ASHJU2165 SPK.K121N3PAKPL0672,KY-UXQXOX_-ZBV95P_C.,TB64M23N.3J_.-81LMJHH 0FKTDO.,R7UD?9KLPU30?JS3-HP,.3MVHNYJ_WAHWB6O6C.JB_BSV,3IM7P6 EUHKQO9E-ACKD3WSFTUUEUMEO89Y.KI3CNL4EPC_73EJR,UIJ6OJO,FW2712 P_MAO?YTQDZY2ZRN8RO7.1OCBS1PEIHK8.V5QH5-I-7M__WIAIIYDMU.G

The numbers, Mason. What do they mean?

Interestingly, he notes that the first code consists of 374 characters and 7 lines of characters. He has attempted to run it through some deciphering programs (presumably HEX and the like) but without any good results.

Mob of the Dead has been filled with a plethora of easter eggs, several of which are easily as complicated as this one—but nothing, to date, has required actual cryptological skills until now. If you can figure it out, feel free to share your results in the comments below.