Collision in Fresnel domain asymmetric cryptosystem using phase truncation and authentication verification

Isha Mehra; Sudheesh K. Rajput; Naveen K. Nishchal

doi:10.1117/1.OE.52.2.028202

18 February 2013 Collision in Fresnel domain asymmetric cryptosystem using phase truncation and authentication verification

Isha Mehra, Sudheesh K. Rajput, Naveen K. Nishchal

Author Affiliations +

Optical Engineering, Vol. 52, Issue 2, 028202 (February 2013). https://doi.org/10.1117/1.OE.52.2.028202

Abstract

Collision is a phenomenon in which two distinct inputs produce an identical output, so if an attacker finds the encryption keys in such a way that when it is applied to an encrypted image, it produces an arbitrary image instead of original one. We propose collision in an asymmetric cryptosystem based on a phase-truncated Fresnel transform. For encryption, instead of using conventional random-phase masks, structured phase masks with desired construction parameters are used. The decryption keys are generated using the amplitude and phase truncation. An attacker generates an arbitrary (collision) image from the encrypted image using a modified Gerchberg-Saxton phase retrieval algorithm. Two different users, authorized and unauthorized user (attacker), can claim the retrieved image as the original data. The authorized user uses the correct decryption keys and retrieves the original image, while an unauthorized user uses the generated keys and retrieves the collision image. In order to verify the authenticity of the retrieved data, a joint transform correlator is used. A sharp auto-correlation peak is obtained when an image retrieved by authorized user is matched with the encrypted image. However, cross-correlation is obtained when an encrypted image is matched with the collision image. Results of computer simulation support the idea of the proposed collision.

Citation Download Citation

Isha Mehra, Sudheesh K. Rajput, and Naveen K. Nishchal "Collision in Fresnel domain asymmetric cryptosystem using phase truncation and authentication verification," Optical Engineering 52(2), 028202 (18 February 2013). https://doi.org/10.1117/1.OE.52.2.028202

Published: 18 February 2013

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available