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giffy

this dog has a secret this dog fell down

Can you tell the difference between these two animated gifs? They are different. Open each in a hex editor if you don't believe me or... use this program to decode the secret message in the second one!

Compile

make giffy

Usage

Encode a message:

$ ./giffy.exe e [input-image-file] [output-filename] [message-string]

Decode a message:

$ ./giffy.exe d [input-image-file]

Example

Encode:

$ ./giffy.exe e /input/path/to/file /desired/output/my_filename 'hey Lindsay, what is new with you?'

Decode:

$ ./giffy.exe d ~/my_filename

hey Lindsay, what is new with you?

It's just like passing notes in class.

lots of thanks to this and this.

About

An innocuous venture into steganography via gif files

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