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CryptoEZ
CryptoEZ
Category: Cryptography
Author: Abhay Krishna
This challenge explores the basics of image cryptography with basic concepts like EXIF metadata and steganography
Initial Analysis
As the description suggests there is something hidden inside the message it is very common and basic to view the metadata of the Image.
Tools Used
- Online EXIF data viewer
- Zsteg
Step-by-Step Solution
Step 1: Check EXIF Metadata
On viewing the metadata of the image we can see a hint saying “Listen to the least significant whispers”. This indicates the use of LSB steganography - a technique for hiding secret data by replacing the least significant bits (LSBs) of a carrier file, like an image, with the bits of the hidden message.
Step 2: Use Steganography Tools
To solve this we can use tools like zsteg which is used for detecting and extracting steganographic data from images.
Step 3: Extract Hidden Data
On running the command: ```shell zsteg flag.png
b1,r,lsb,xy .. text: “<~^#vS\p” b1,g,msb,xy .. file: OpenPGP Secret Key b1,rgb,lsb,xy .. text: “CYS{y0u_kn0w_cryp70}” b4,r,lsb,xy .. text: “vU"#4"$DDDD3#C2 “ b4,g,lsb,xy .. text: “##DEEVfeef” b4,b,lsb,xy .. text: “"3EUUUEEEEfw” b4,rgb,lsb,xy .. text: “`U’rw’rw’qf” b4,bgr,lsb,xy .. text: “Pw’rw’rw&af”
Flag:
- CYS{y0u_kn0w_cryp70}
Flag
CYS{y0u_kn0w_cryp70}