ISEC(May.) was held in Kikai-Shinkou Kaikan at the foot of Tokyo Tower. There were 11 presentations and about 40 or 50 participants there. The contents of the presentations were elliptic curve cryptosystem(2), secret sharing scheme(2), construction of public key cryptosystem(1), cryptanalysis of public key cryptosystem(1), construction of secret key cryptosystem(1), cryptanalysis of secret key cryptosystems(1), tamper registance software(1), quantum cryptography(1), and privacy amplification(1).