Document image secret sharing using bit-level processing

A new bit-level based secret sharing scheme for encryption of private financial and pharmaceutical digital documents, and digital signature images is provided. The proposed {k,n} secret-sharing method allows for secret sharing of both scanned binary documents and the computer-generated artworks encrypting the document image into n shares. The secret information is recovered only if k (or more) allowed shares are available for decryption. Cryptographic operations for both encryption and decryption procedures are directly performed in the decomposed bit-level domain. The methods reveals the original document unchanged and thus, the scheme satisfies the perfect reconstruction property.