These are some links to various NTT encryption algorithms and to an NTT digital signature algorithm.

Encryption:

EPOC family
 EPOC-1
 EPOC-2 Updated! 12/4/2003
 EPOC-3

PSEC family
 PSEC-1
 PSEC-2
 PSEC-KEM Updated! 1/21/2004
 PSEC-3

Digital Signature:

ESIGN Updated! 5/23/2002