secret key cryptography; symmetric key cryptography
secret, conceal
ヒ / ひ.める
secrecy, density (pop), minuteness, carefulness
ミツ / ひそ.か
key
ケン / かぎ
darkness, disappear, shade, informal, grow dark, be blinded
アン / くら.い
nickname, number, item, title, pseudonym, name, call
ゴウ / さけ.ぶ