Optical Encryption and Authentication Based on Phase Retrieval and Sparsity Constraints

Sparsity-based super-resolution and phase-retrieval in waveguide arrays.

We present a scheme for recovering the complex input field launched into a waveguide array, from partial measurements of its output intensity, given advance knowledge that the input is sparse. In spite of the fact that in general the inversion problem is ill-conditioned, we demonstrate experimentally and in simulations that the prior knowledge of sparsity helps overcome the loss of information....

Permutation-based encryption, authentication and authenticated encryption

While mainstream symmetric cryptography has been dominated by block ciphers, we have proposed an alternative based on fixed-width permutations with modes built on top of the sponge and duplex construction, and our concrete proposal K . Our permutationbased approach is scalable and suitable for high-end CPUs as well as resource-constrained platforms. The la er is illustrated by the small K insta...

Fast Encryption and Authentication: XCBC Encryption and XECB Authentication Modes

We present the eXtended Ciphertext Block Chaining (XCBC) schemes or modes of encryption that can detect encrypted-message forgeries with high probability even when used with typical noncryptographic Manipulation Detection Code (MDC) functions (e.g., bitwise exclusive-or and cyclic redundancy code (CRC) functions). These modes detect encrypted-message forgeries at low cost in performance, power,...

PbAE - picture based authentication and encryption

task-based language teaching in iran: a mixed study through constructing and validating a new questionnaire based on theoretical, sociocultural, and educational frameworks

جنبه های گوناگونی از زندگی در ایران را از جمله سبک زندگی، علم و امکانات فنی و تکنولوژیکی می توان کم یا بیش وارداتی در نظر گرفت. زبان انگلیسی و روش تدریس آن نیز از این قاعده مثتسنی نیست. با این حال گاهی سوال پیش می آید که آیا یک روش خاص با زیر ساخت های نظری، فرهنگی اجتماعی و آموزشی جامعه ایرانی سازگاری دارد یا خیر. این تحقیق بر اساس روش های ترکیبی انجام شده است.پرسش نامه ای نیز برای زبان آموزان ...