A solution to improving encryption efficiency of DTRU cryptosystem

DTRU, a new variant of NTRU public - key cryptosystem, has some advantages in comparison with original NTRU at the same security levels. However, in DTRU, the cipher-text is at least three time longer than the plain-text i.e., message-expansion factor of DTRU is higher than that of other well-known public-key cryptosystems.
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A solution to improving encryption efficiency of DTRU cryptosystem