Mob of the Dead/Ciphers and Scrap Paper

There are 4 ciphers and 1 scrap paper in Mob of the Dead and a cipher in the loading screen of the map.

Cipher #1
This cipher is a Hill cipher with 41 characters alphabet. The key used to decode the message is "MOBOFTHEDEADABCD" and came from the 4x4 encoding matrix in the loading screen of the map.

The plaintext is as follows:

"While I realize that the current lack of cooperation from Chicago's finest leaves us at something of a disadvantage, I find your latest report extremely troubling. The alliance that exists between our outfit and the north side gangs must be sustained - Lest we face a repeat of February 19th 1929."

Cipher #2
This cipher is a Hill cipher with 41 characters alphabet. The key is the same as the first cipher.

The plaintext is as follows:

"The answer is simple. No divorce. No matter what ideas Angela may have about making a new life, she needs to understand it's not going to happen. I didn't pluck her pretty little tush from chorus line obscurity just so she can turn around and screw me as soon as times get tough. No divorce. She can leave this marriage, the day she leaves this Earth."

Cipher #3
This cipher is a Hill cipher with 41 characters alphabet. The key is the same as the first cipher.

The plaintext is as follows:

"I know it's been a long time, but I wanted to write you just so you know I'm doing well. It's been a long time coming, but I finally managed to make a success of myself in the city. Works been good to me these last few years, so much so that I decided to take a bit of time off. i'll write you again when I get back to work... Maybe I'll even send you some pictures."

Cipher #4
This cipher is a Hill cipher with 41 characters alphabet. The key is the same as the first cipher.

The plaintext is as follows:

"Enclosed are some more recent illustrations from my proposed comic strip Icarus from Mars. While I understand that you were less than enthusiastic about my previous submissions, I would urge you to look again with fresh eyes. Laid up in the hospital means I've had more time than even to devote to my craft, and my artwork is improving by leaps and bounds. Eagerly waiting your response, Albert Arlington."

Cipher #5
This cipher, present in the loading screen, is a ADFGX cipher. It is currently unsolved

Scrap Paper
There's one scrap paper around the map. When the pieces are put together the result is a page from Arlington's comic book "Icarus from Mars" with notes from his editor.