The improvement for the scheme is proposed. The new scheme can fully resist birthday attack.
并对原方案作了改进，改进后的方案能完全抵抗生日攻击。
He was stricken by a heart attack on his fiftieth birthday.
他在五十岁生日那天心脏病发作。
Four days after his sixty-seventh birthday, he had a heart attack.
爸爸过了六十七岁生日后的第四天，他心脏病发作。
Four days after his sixty-seventh birthday, he had a heart attack.
爸爸过了六十七岁生日后的第四天，他心脏病发作。
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