Crypto Challenge 4 - Decoding 4

Prompt

Cyber Command: We discovered a hacker group passing flags around using a mysterious format. Can you find the flag?

Answers

Q1 (5 pts) - What is the name of the medium the data is encoded on?
Punch Card

Q2 (40 pts) - What is the flag?
SKY-####-#### (obtained during challenge)

Steps I Took

Had no idea what I was looking at. Reverse image searched the provided image and found it was an IBM punch card.

Tried a basic punch card decoder — too confusing. Found a better one at gen5.info which helped.

Didn’t fully understand it until my teacher worked through the challenge in class. After that the logic made sense:

• There are 3 rows, each representing a set of letters
• The columns represent which letter in that row is selected