Encoding plaintext by Fourier transform hologram in double random phase encoding using fingerprint keys

Abstract

It has been shown that biometric information can be used as a cipher key for binary data encryption by applying double random phase encoding. In such methods, binary data are encoded in a bit pattern image, and the decrypted image becomes a plain image when the key is genuine; otherwise, decrypted images become random images. In some cases, images decrypted by imposters may not be fully random, such that the blurred bit pattern can be partially observed. In this paper, we propose a novel bit coding method based on a Fourier transform hologram, which makes images decrypted by imposters more random. Computer experiments confirm that the method increases the randomness of images decrypted by imposters while keeping the false rejection rate as low as in the conventional method.

Securing information using optically generated biometric keys

“…Figure 1 shows the flow diagram for generation of the fingerprint biometric keys. In this study, an optoelectronic experimental approach is implemented to investigate the potential use of digital holography for key generation with usability advantages, instead of taking a transform and computing the security key [9][10][11]. For this purpose, the fingerprint hologram of a person is recorded, stored and is numerically reconstructed.…”

“…Several optical techniques based on the DRPE scheme have been reported in which fingerprint biometric is utilized as the secret phase mask key at the Fourier plane [9][10][11]. The reported methods are proposed only for binary data encryption, and still have limitations and drawbacks due to insufficient correlation between the genuine and imposter fingerprint biometric, and reduces the performance of the cryptosystem due to the bit pattern not being hidden completely [9][10][11]. Moreover, a new optical encryption technique is also investigated by adding more security layers to enhance the encryption level of the DRPE scheme.…”

“…These methods are also accurate for information authentication and data security [17- 19]. It is saliently observed in the reported methods that either the phase or the amplitude information of the fingerprint as a secret key is utilized for the encryption and the decryption [9][10][11][17][18][19]. However, it is clear that in our approach we include an optoelectronics transformation process for biometric keys generation which make the key unique to the user because of the associated fingerprint biometric.…”

“…Therefore, RPM based techniques suffer from the problem of key management and authentication. In order to solve these issues, new optical security schemes based on DRPE have been developed for smart card holder authentication system, in which the fingerprint biometric is transformed into the Fourier domain and its phase part is used as the second RPM key [9][10][11]. This key has advantages in terms of authentication but also has some problems like, wrong authentication because of the large position difference between the enrollment and verification fingerprints.…”

Optical cryptography with biometrics for multi-depth objects

“… 15 and Takeda et al . 16 have proposed the encryption methods using fingerprint keys with DRPE to avoid some attacks and improve security. In traditional cryptography, key is not strongly linked with its owner.…”