Results 191 to 200 of about 16,425,580 (227)

Helium Ion‐Induced Degradation Mechanisms in Optical Coatings for Space Applications

Advanced Optical Materials, EarlyView.
Although low‐energy helium ions represent a significant source of degradation for optical coatings operating in space environments, their effects remain poorly understood. Systematic irradiation of over 150 metal and dielectric thin‐film samples at 4, 16, and 100 keV investigates the damage mechanisms and their impact on optical performance ...
Alain J. Corso, Marta Padovani, René Hübner, Ulrich Kentsch, Andrea Meneguzzo, Maria G. Pelizzo   +5 more
wiley   +1 more source

Wavelength‐Multiplexed 2D Beam Steering via a Passive Diffractive Network

Advanced Optical Materials, EarlyView.
Illustration of a wavelength‐multiplexed diffractive beam steering system, which is composed of K cascaded diffractive layers, each containing phase‐modulating elements that are jointly optimized using deep learning–based optimization. When illuminated with a set of wavelengths {λ1,λ2,…,λNw}$\{ {{{\lambda }_1},{{\lambda }_2},\ldots ,{{\lambda }_{{{N}_w}
Che‐Yung Shen, Yuhang Li, Çağatay Işıl, Tianyi Gan, Mona Jarrahi, Aydogan Ozcan   +5 more
wiley   +1 more source

Identifying Physical Interactions in Contact‐Based Robot Manipulation for Learning from Demonstration

Advanced Robotics Research, EarlyView.
Robots can learn manipulation tasks from human demonstrations. This work proposes a versatile method to identify the physical interactions that occur in a demonstration, such as sequences of different contacts and interactions with mechanical constraints.
Alex Harm Gert‐Jan Overbeek, Herman van der Kooij, Douwe Dresscher, Mark Vlutters   +3 more
wiley   +1 more source

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A tutorial on public key cryptography

Computers and Security, 1982
Abstract Public key cryptography provides the means for establishing instantaneous, secure communication between any two persons or any two computers. The prior exchange of a secret quantity, called the cryptographic key, is not necessary. In this paper, the underlying mathematical principles of public key (PK) cryptography are informally introduced ...
exaly   +3 more sources

The Complexity of Public-Key Cryptography [PDF]

, 2017
We survey the computational foundations for public-key cryptography. We discuss the computational assumptions that have been used as bases for publickey encryption schemes, and the types of evidence we have for the veracity of these assumptions.
Boaz Barak
openaire   +4 more sources

Public-key cryptography and password protocols

Proceedings of the 5th ACM conference on Computer and communications security, 1998
We study protocols for strong authentication and key exchange in asymmetric scenarios where the authentication server possesses ~a pair of private and public keys while the client has only a weak human-memorizable password as its authentication key. We present and analyze several simple password authentication protocols in this scenario, and show that ...
Shai Halevi, Hugo Krawczyk
openaire   +3 more sources

Public-Key Cryptography and Availability

2005
When the safety community designs their systems to also maintain security properties, it is likely that public-key encryption will be among the tools that are applied. The security guarantees of this technology are based on a particular model of computation.
Tage Stabell-Kulø, Simone Lupetti
openaire   +2 more sources

Introduction to Public-Key Cryptography

2005
In this chapter we introduce the basic building blocks for cryptography based on the discrete logarithm problem that will constitute the main motivation for considering the groups studied in this book. We also briefly introduce the RSA cryptosystem as for use in practice it is still an important public-key cryptosystem.
Avanzi, R., Lange, T.
openaire   +2 more sources

Public Key Cryptography

2002
The basic idea of public-key cryptography are public keys. Each person’s key is separated into two parts: a public key for encryption available to everyone and a secret key for decryption which is kept secret by the owner. In this chapter we introduce the concept of public-key cryptography.
Hans Delfs, Helmut Knebl
  +4 more sources

Public Key Cryptography

AT&T Technical Journal, 1994
This article explains public key cryptography, its benefits and limitations.
openaire   +1 more source