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Japan's Emperor Akihito (R) and Empress Michiko (L) arrive at the national theatre to attend the Japan Prize ceremony in Tokyo on April 19, 2017. / AFP PHOTO / Behrouz MEHRI (Photo credit should read BEHROUZ MEHRI/AFP/Getty Images)

Japan's Emperor Akihito (R) and Empress Michiko (L) arrive at the national theatre to attend the Japan Prize ceremony in Tokyo on April 19, 2017. / AFP PHOTO / Behrouz MEHRI        (Photo credit should read BEHROUZ MEHRI/AFP/Getty Images)

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Japan's Emperor Akihito (L) and Empress Michiko (R) attend the Japan Prize ceremony at the national theatre in Tokyo on April 19, 2017. / AFP PHOTO / Behrouz MEHRI (Photo credit should read BEHROUZ MEHRI/AFP/Getty Images)

Japan's Emperor Akihito (L) and Empress Michiko (R) attend the Japan Prize ceremony at the national theatre in Tokyo on April 19, 2017. / AFP PHOTO / Behrouz MEHRI        (Photo credit should read BEHROUZ MEHRI/AFP/Getty Images)

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Japan's Emperor Akihito (L) and Empress Michiko (R) arrive at the national theatre to attend the Japan Prize ceremony in Tokyo on April 19, 2017. / AFP PHOTO / Behrouz MEHRI (Photo credit should read BEHROUZ MEHRI/AFP/Getty Images)

Japan's Emperor Akihito (L) and Empress Michiko (R) arrive at the national theatre to attend the Japan Prize ceremony in Tokyo on April 19, 2017. / AFP PHOTO / Behrouz MEHRI        (Photo credit should read BEHROUZ MEHRI/AFP/Getty Images)

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Japan's Emperor Akihito (C) and Empress Michiko (R) congratulate Adi Shamir of Israel (2nd R) after receiving the Japan Prize in the 'electronics, information and communication' field, during a ceremony in Tokyo on April 19, 2017. Shamir was awarded the 33rd Japan Prize for his contributions to information security through pioneering research on cryptography. / AFP PHOTO / Behrouz MEHRI (Photo credit should read BEHROUZ MEHRI/AFP/Getty Images)

Japan's Emperor Akihito (C) and Empress Michiko (R) congratulate Adi Shamir of Israel (2nd R) after receiving the Japan Prize in the 'electronics, information and communication' field, during a ceremony in Tokyo on April 19, 2017.
Shamir was awarded the 33rd Japan Prize for his contributions to information security through pioneering research on cryptography. / AFP PHOTO / Behrouz MEHRI        (Photo credit should read BEHROUZ MEHRI/AFP/Getty Images)