Call of Duty: Black Ops Cold War

If you have completed the campaign without doing any side mission, you can play them quickly by selecting the mission "Safehouse: Cuba briefing".

Just skip the intro cutscene and the evidence board will have the missions along with all the evidence you previously collected.

For those who are still interested in cracking the Floppy disk for Operation Chaos, you need to get the three pieces of evidence.

1st piece of evidence is found on the mission Nowhere Left To Run. Whilst your interrogating Qasim make sure your don't pick any of the [Throw] options in the dialog. He will then give you the first piece of evidence.

2nd piece of evidence is found on the mission Brick In The Wall. A little bit into the mission you will meet an informant at the bar and she'll give you a side objective to rescue or silence Lukas Richter. Up to you if you want to free him or not. The evidence will be on a table in the room where you find him.

3rd piece of evidence is found on the mission Redlight, Greenlight. You need to photograph all six maps that can be all around the mission. I used this to find them all. Credit Eurogamer

Once you've got all three pieces of evidence you are ready to start cracking the floppy disk.

Look at the Newspaper evidence and write down all the letters that are in red. Then look at the Numbers Station Broadcast evidence and look at all the cities. You then need to work out what your city is by trying to match the red letters to a city that's on the Number's Station Broadcast.

For example my newspaper had nahele which in turn spells Helena.

Once you've found your city write down the four numbers that are next to it. My four numbers were 7044. I would also advise writing down all the cities in the list for the next section.

You are now ready to start decrypting the floppy disk. Click on Decrypt Floppy Disk. The code will be the four numbers that are next to the city that you had in the newspaper. The passphrase will be a random city that's in the Number's Station Broadcast. If you get Access Denied you didn't pick the right city. Type in the same code and different city to try again. When you type in the right city you will get the message Access Granted.

Hope this helped, recently helped a friend do it on PS4 via share play.

I was struggling to understand the Coded Message evidence.

You must beat the side mission to get the achievement you can just do it right away when you unlock the mission, if you want you can decrypt the floppy disk. The Code is random for everyone and is not needed for this achievement.

If you want to get the code use the highlighted text on the newspaper to find the letters of a city and then the tape will tell you the numbers that you use as your code. The encoded message will have two question mark spots that you have to find and the combination of those two numbers will give you the numbers of another city on the tape and that city is the word portion of the code. To solve the encoded message find a pattern in the black numbers and a pattern in the red numbers to fill in the blanks. For me the patterns were increase 1, increase 2, increase 3, etc. on black and +8 for each number on red.

very easy mission

no requirements to unlock it