[PDF] Top 20 Uma Abordagem Estatística da Fecundidade em Portugal (1995-2009)

... A secure cryptosystem for gray images based on chaos is proposed in this ...The cryptosystem utilizes an improved sine map as a key generator and a diffusion ... See full document

... techniques based on chaos theory reveal some new and effective directions to develop secure image encryption ...an image encryption using 1 D logistic map. The proposed scheme is ... See full document

... on chaos-based cryptosystems has been ...small key space. The key stream generator is the key design issue of an encryption ...to image encryption based on hyper ... See full document

... public key of the receiver, which contained a large number integer (s) and a computed (Ts(x)) based on the previous equation to get (x, Ts(x)) then encrypted the message after converted it to the interval ... See full document

... for image encryption [1] [6] due to the requirement of much more processing pow- er, bandwidth and longer time which causes low-level efficiency during encryp- tion and decryption processes ... See full document

... the key problem of designing an efficient image cryptosystem is how to reduce the computational complexity with efficiently to avoid the large number of rounds in the generation of diffusion and ... See full document

... 92 characters case sensitive cipher including digits and some other symbols commonly used in the English language and can be written from a computer keyboard. The alpha-qwerty cipher also changes the mapping sequence ... See full document

... 4. Khan, I.R., Ohba, R., and Hozumi, N.: Mathematical proof of closed form expressions for finite difference approximations based on Taylor series, Journal of Computational and Applied Mathematics, 150(3), 303-309 ... See full document

... map based two phase image encryption/decryption scheme in hardware implementation using Verilog code with an external secret key of ...original image, encrypted image, decrypted ... See full document

... human-set key: Consider a two- factor security system with none of the above two methods which contribute to shortcomings ...is based on two factors, one a private key and the other a security device ... See full document

... Organization. The rest of this paper is organized as follows. In Section 2, we introduce some notations and concepts on the multivariate public key cryptosys- tems. In Section 3, we design a novel one-way trapdoor ... See full document

... for secure image transmission is proposed in [4], where turbo codes were used for error free communication in contrast to chaos based encryption ...robust image transmission using a ... See full document

... to secure the data exchanges between installed/wearable sensors and the data sink/data buyers (masters or medicinal guardian) by using Ciphertext-Policy Attribute Based Encryption (CP ABE) and stamp to ... See full document

... an improved NTRU cryptosystem to overcome the decryption failures of the original NTRU and then present a secure and verifiable access control scheme based on the improved NTRU to ... See full document

... secret key to the delegatee, a useful primitive is proxy re-encryption ...public- key into ones for ...secret key can be recovered which can decrypt senders(convertible) ciphertexts without receivers ... See full document

... Security plays a vital role for various systems which are used by everyone on a daily basis. Biometrics recognizes the problems associated with security. It provides enhanced security by incorporation of various human ... See full document

... compressed key support delegation of secret keys are ...hierarchical key assignment whichis used in existing system. The compressed key can only save spaces if all key-holders share a similar ... See full document

... method based on Arnold transform and Integer Discrete Wavelet Transform ...the image into its wavelet domain. The chaos sequence is used in the paper for the proving the ... See full document

... Benaloh proposed an encryption scheme, where a huge number of keys can be sent rapidly in a broadcast scenario. The key origin is as follows. Initially choose two prime numbers p and q for a composite module. At ... See full document

... information secure we use chaos based visual cryptography, which is the combination of chaos based image encryption and secret image sharing using visual ...secret ... See full document