CASE 014 · Contraction-Choice Steganography

Compressed Alibis

A four-letter signal is carried by full-form and contracted wording. Use the recovered rule to reconstruct the message.

Advanced 350 pts Hint penalty: 45 pts

Artifact

Inspect this carefully

The analysts do not enter the archive before the morning check. The first corridor isn't listed on the public plan. A damaged latch cannot explain the second footprint. The night team will not move the cabinet until photographs are complete. The caretaker didn't notice the blue thread near the hinge. The old camera does not cover the service stair. The missing key wasn't found in the desk drawer. The side doors weren't opened during the logged interval.

The evidence tag has not changed since intake. The technicians haven't reset the hallway sensor. The morning crew had not inspected the roof hatch. A careful reviewer would not ignore the duplicated time stamp. The witness couldn't identify the sound from the basement. The team shouldn't assume the shortest route was used. The final notes aren't arranged by discovery time. By midnight, it is clear that the route crossed two floors.

Investigators do not remove the map from its sleeve. The narrow passage isn't visible from the main landing. One smudged print cannot establish who touched the rail. The evidence clerk will not reseal the box before review. The guard didn't hear the elevator stop between floors. The wall clock doesn't match the terminal record. The lower window wasn't locked when the survey began. Two storage bins weren't included in the first inventory.

The paper seal has not separated along the upper edge. The analysts haven't compared the two handwritten notes. The previous shift had not logged the maintenance cart. A cautious examiner wouldn't treat the stain as decisive. The first camera could not see the doorway behind the partition. The search team shouldn't disturb the dust along the baseboard. The recovered pages are not numbered in chronological order. At the end of the review, it is possible to reconstruct the sequence.

Recovered contraction rule

Read the 16 carrier pairs below in order. For each pair, the full form on the left represents 0 and the contracted form on the right represents 1. The 16-pair codebook repeats exactly once, producing 32 bits. Group the result into four 8-bit ASCII bytes.

  1. do not / don't
  2. is not / isn't
  3. cannot / can't
  4. will not / won't
  5. did not / didn't
  6. does not / doesn't
  7. was not / wasn't
  8. were not / weren't
  9. has not / hasn't
  10. have not / haven't
  11. had not / hadn't
  12. would not / wouldn't
  13. could not / couldn't
  14. should not / shouldn't
  15. are not / aren't
  16. it is / it's
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    About the technique

    Contraction-Choice Steganography

    Contraction-choice steganography maps curated full forms and contractions to symbolic states. It can preserve ordinary meaning, but it is style-sensitive and fragile because editing, tone normalization, apostrophe changes, or paraphrasing can flip or erase carrier positions.

    Read the related field guide →

    Questions

    Frequently asked

    What is contraction-choice steganography?

    It is a linguistic hidden-information technique that assigns symbols such as binary 0 and 1 to curated full-form and contracted alternatives at known carrier positions.

    Are full forms and contractions always interchangeable?

    No. Register, emphasis, dialect, grammar, and surrounding syntax can make one form more natural or even required, so carrier positions need context-specific review.

    Why can copy/paste or rewriting break the message?

    Editors and paraphrasers may expand contractions, introduce contractions, normalize apostrophes, or rewrite the clause entirely, which changes the encoded states or their synchronization.