Nonbinary audio cryptography.
In: Pfitzmann, A, (ed.)
INFORMATION HIDING, PROCEEDINGS.
(pp. 478 - 489).
Visual cryptography, introduced by Naor-Shamir at Eurocrypt '94, only requires primitive technology to decrypt the ciphertext. However, a disadvantage of it is that the "ciphertext", as a random looking transparency, is suspicious to a censor. The solutions recently proposed by Desmedt-Hou-Quisquater to avoid these problems are neither user friendly, having a low bandwidth, nor are tested. In this paper we present three schemes that overcome these problems. As in one of the Desmedt-Hou-Quisquater's schemes, a share (or a ciphertext) corresponds to an audio signal, such as music. While in the Desmedt-Hou-Quisquater scheme the plaintext was binary, in our schemes the plaintext can also be speech, or any other audio signal. By introducing variations of the one-time pad we guarantee perfect secrecy. The ciphertext is nonsuspicious, when tested with human ears, is indistinguishable from normal music.
|Title:||Nonbinary audio cryptography|
|Event:||3rd International Workshop on Information Hiding (IH 99)|
|Dates:||1999-09-29 - 1999-10-01|
|Keywords:||audio cryptography, information hiding, perfect secrecy, visual cryptography, speech encryption|
|UCL classification:||UCL > School of BEAMS > Faculty of Engineering Science > Computer Science|
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