Another thing to remember is that Groundspeak will automatically scale large images when they are uploaded. To get the filename of an image, right click on the image and choose the option 'properties'.Ī cache owner can try to upload a different type of image but Groundspeak will always convert the uploaded image to a jpeg format. Jpeg images have a file name that ends with. So what makes an image suspicious?Īs you might know, only supports jpeg images. In the first part of this cache page we will look at some ways to hide information in images. There is a lot of information that can be hidden in an image. With geocaching puzzles we might add "and a couple of numbers". The saying goes that "a picture is worth 1000 words". The stegotext in this case was the doll orders the 'plaintext' being concealed was itself a codetext giving information about ship movements, etc. She was a dealer in dolls, and her letters discussed how many of this or that doll to ship. The message allegedly carried a warning to Greece about Persian invasion plans.ĭuring World War II, a spy for the Japanese in New York City, Velvalee Dickinson, sent information to accommodation addresses in neutral South America. The recipient would then simply melt the wax to read the message.Īlso in ancient Greece, Herodotus tells the story of a message tattooed on a slave's shaved head, hidden by the growth of his hair, and exposed by shaving his head again. A secret message could be hidden by writing the message directly on the wood before covering it with wax. In ancient Greece, wooden tablets covered with layers of wax were often used as the medium for writing messages.
(Remember the opening scenes of The DaVinci Code?) A secret message may be written in invisible ink over top of the cover text to read it, the recipient would hold the cover text up to a particular shade or intensity of light.
One of the most well-known steganographic tools is invisible ink. Probably the best way to understand this process is with some examples: The stegotext is often surrounded with nulls, which are extra pieces of information not part of the hidden message but which are included to increase confusion and distraction for those seeking the message. This ciphertext is then embedded into the covertext to create the stegotext. To create a steganographic message, the plaintext is typically encrypted in some manner using a cipher to create the ciphertext. This apparent message is called the covertext. A message can be a letter, an article, a shopping list, a photograph, an audio recording, or some other form. The word steganography is of Greek origin and means "concealed writing" from the Greek words steganos meaning "covered or protected", and graphein meaning "to write".Ī steganographic message appears to be something else, typically something common and innocuous. Steganography is the art and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message, a form of security through obscurity. When you check your coordinates, each cache will reveal a piece of information you'll need to take the final exam (the thirteenth cache in the series).
Study the lesson, complete the exercise, and you'll find the location of a geocache.
#Best hex editors for steganography how to#
Each one contains a lesson focusing on a specific skill, examples of how to use that skill, an exercise to test that skill, and a cache to find as a reward.
#Best hex editors for steganography series#
The first twelve caches in this series will help you build your puzzle-solving skills. This series is based on the original puzzle solving 101 by ePeterso2. The cache is not at the posted coordinates
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