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Related Concept Videos

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons00:58

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Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...
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In the same year as the discovery of the Sanger sequencing method, another group of scientists, Allan Maxam and Walter Gilbert, demonstrated their chemical-cleavage method for DNA sequencing. The Maxam-Gilbert method relies on using different chemicals that can cleave the DNA sequence at specific sites, the separation of resulting DNA fragments of variable size using electrophoresis, and deciphering the DNA sequence from the resulting gel bands.
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Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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A Hash-Based Quantum-Resistant Chameleon Signature Scheme.

P Thanalakshmi1, R Anitha1, N Anbazhagan2

  • 1Department of Applied Mathematics and Computational Sciences, PSG College of Technology, Coimbatore 641004, India.

Sensors (Basel, Switzerland)
|December 28, 2021
PubMed
Summary

This study introduces a new quantum-secure chameleon signature scheme using hash functions. This post-quantum cryptography approach offers enhanced privacy and security for sensitive digital transactions against future threats.

Keywords:
Preimage Resistancechameleon signaturedigital signaturehash-based cryptographyhomomorphic hash functionkey exposure freerandom oracle model

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Area of Science:

  • Cryptography
  • Computer Science
  • Information Security

Background:

  • Standard digital signatures lack privacy for sensitive applications as they can be verified by anyone.
  • Chameleon signature schemes, based on hash-then-sign, were developed to address privacy concerns by allowing recipients to compute hash collisions.
  • Existing chameleon signature schemes rely on number theory problems vulnerable to quantum computing.

Purpose of the Study:

  • To propose a novel quantum-secure chameleon signature scheme.
  • To provide a secure alternative to number theory-based methods in the advent of quantum computing.
  • To ensure privacy and security for sensitive digital applications in a post-quantum era.

Main Methods:

  • Development of a new chameleon signature scheme based on hash functions.
  • Leveraging hash-based cryptography principles for post-quantum security.
  • Ensuring the scheme is key exposure-free.

Main Results:

  • The proposed scheme offers quantum security, a critical requirement for future cryptographic systems.
  • It provides a viable, hash-based alternative to traditional number theory-based chameleon signatures.
  • The scheme meets essential security requirements including semantic security, non-transferability, and unforgeability.

Conclusions:

  • The novel hash-based chameleon signature scheme is a promising post-quantum solution.
  • It enhances privacy and security for digital signatures against quantum threats.
  • The scheme offers a robust and secure alternative for sensitive applications.