Since the Crimean crisis, the US has continuously tightened financial sanctions on Russia. In the short term, this doesn't appear to be working very effectively, but in the long run, it has indeed had an irreversi...Since the Crimean crisis, the US has continuously tightened financial sanctions on Russia. In the short term, this doesn't appear to be working very effectively, but in the long run, it has indeed had an irreversible impact on the Russian economy. Though the US has repeatedly upgraded its sanction plans, four puzzles have long remained unsolved: appropriate sanctions have avoided a humanitarian crisis, but raised moral dilemmas; actual enforcement of sanctions is getting more and more difficult; EU cooperation with the US is vital, but the two regions more often than not play different tunes; and the frequent use of sanctions weakens US legitimacy and integrity, leading to a degradation of the sanction mechanism. Sanctions have continued to be implemented since President Trump took office, but with some new adjustments.展开更多
Several quantum signature schemes are recently proposed to realize secure signatures of quantum or classical messages. Arbitrated quantum signature as one nontriviai scheme has attracted great interests because o~ its...Several quantum signature schemes are recently proposed to realize secure signatures of quantum or classical messages. Arbitrated quantum signature as one nontriviai scheme has attracted great interests because o~ its usefulness and efficiency. Unfortunately, previous schemes cannot against Trojan horse attack and DoS attack and lack of the unforgeability and the non-repudiation. In this paper, we propose an improved arbitrated quantum signature to address these secure issues with the honesty arbitrator. Our scheme takes use of qubit states not entanglements. More importantly, the qubit scheme can achieve the unforgeability and the non-repudiation. Our scheme is also secure for other known quantum attacks.展开更多
文摘Since the Crimean crisis, the US has continuously tightened financial sanctions on Russia. In the short term, this doesn't appear to be working very effectively, but in the long run, it has indeed had an irreversible impact on the Russian economy. Though the US has repeatedly upgraded its sanction plans, four puzzles have long remained unsolved: appropriate sanctions have avoided a humanitarian crisis, but raised moral dilemmas; actual enforcement of sanctions is getting more and more difficult; EU cooperation with the US is vital, but the two regions more often than not play different tunes; and the frequent use of sanctions weakens US legitimacy and integrity, leading to a degradation of the sanction mechanism. Sanctions have continued to be implemented since President Trump took office, but with some new adjustments.
基金Supported by the National Natural Science Foundation of China under Grant No.61303039Sichuan Youth Science and Technique Foundation No.2017JQ0048+2 种基金Fundamental Research Funds for the Central Universities(Nos.2682014CX095)CSC ScholarshipEU ICT COST Crypto Action No.IC1306
文摘Several quantum signature schemes are recently proposed to realize secure signatures of quantum or classical messages. Arbitrated quantum signature as one nontriviai scheme has attracted great interests because o~ its usefulness and efficiency. Unfortunately, previous schemes cannot against Trojan horse attack and DoS attack and lack of the unforgeability and the non-repudiation. In this paper, we propose an improved arbitrated quantum signature to address these secure issues with the honesty arbitrator. Our scheme takes use of qubit states not entanglements. More importantly, the qubit scheme can achieve the unforgeability and the non-repudiation. Our scheme is also secure for other known quantum attacks.
