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Convertible Authenticated Encryption Scheme Without Using Conventional One‐Way Function
Volume 14, Issue 4 (2003), pp. 445–454
Hung‐Yu Chien  

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https://doi.org/10.15388/Informatica.2003.033
Pub. online: 1 January 2003      Type: Research Article     

Received
1 January 2003
Published
1 January 2003

Abstract

An authenticated encryption allows the designated recipient to verify the authenticity while recovering the message. To protect the recipient's benefit in case of a later dispute, a convertible authenticated encryption scheme allows the recipient to convert the authenticated encryption into an ordinary signature so that it becomes a publicly verifiable. This paper shows a universal forgery attack on Araki et al.'s convertible authenticated encryption scheme, and proposes a new convertible authenticated encryption scheme. Without using any conventional one‐way function, the proposed scheme simplifies its security assumption on only a public hard problem – the discrete logarithm problem.

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Keywords
authenticated encryption discrete logarithm one‐way function

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INFORMATICA

  • Online ISSN: 1822-8844
  • Print ISSN: 0868-4952
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