Abstract :
Chen´s scheme (see ibid., vol.34, no.20, p.1934, 1998) is based on the discrete logarithms problem and is claimed to combine the same efficiency as Horster-Michels-Petersen and Lee-Chang with a simpler specification. In addition to a level of message authentication, Chen´s scheme also provides message encryption, although this is only apparent from the detailed specification of the scheme. However, the scheme is not a signature scheme in the normal sense of the term.
