This paper argues the transition as knowledge and skills regarded as ”Culture” in school education, referring the case of Waseda University Senior High School, which had originated from private universities' preparatory department in prewar Japan. As a result of the semi-structured interview for teachers, (1) From the case of Waseda University Senior High School, completion and improvement of personality by reading based on the liberal arts education-based ”culture” established in high schools and universities in the old system was required as knowledge and skills. (2) Students practiced such knowledge and skills through autonomous learning, but gradually no student autonomy was seen. (3) Such knowledge and skills are required not by students but by teachers based on the backbone of their academism. (4) Some teachers believe the value of ”Culture”; however, others rather emphasize the practice of ordinary education that should be conducted in high school as a secondary education.

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A (k,n) threshold based secret sharing scheme has been used to improve both safety and reliability of highly confiden-tial information. When this scheme is applied to preservation of secret key in public key cryptography, there is a risk of the reconstructed secret key being stolen. To overcome such a drawback, a (k,n) threshold based encoding scheme for ElGamal encryption system has been proposed. In this work, we developed a threshold decoding system for El-Gamal encryption using NFC (Near Field Communication). The developed system distributes secret keys of ElGamal cryptographic system to NFC devices such as IC cards and Android smartphones using (k,n) threshold scheme. We confirmed that the developed system can decode cryptograms without reconstructing the secret key.

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