extant number 中文意思是什麼
extant number
解釋
殘存數-
Iraq has one of the most glorious ancient civilisations created by man, with extant artefacts dating back more than 5000 years, a substantial number of which were showcased at the national museum
伊拉克的所在地是最早的古代文明之一，曾有過輝煌燦爛的歷史，並擁有許多超過5000年的古文物，其中大部分珍藏在國家博物館里。 -
Iraq has one of the most glorious ancient civilizations created by man, with extant artifacts dating back more than 5000 years, a substantial number of which were showcased at the national museum
伊拉克的所在地是最早的古代文明之一，曾有過輝煌燦爛的歷史，並擁有許多超過5000年的古文物，其中大部分珍藏在國家博物館里。 -
The main work of this thesis include the following aspects : ( 1 ) after deeply analyzing and probing the one - time password authentication technology, aiming for the deficiency of the extant systems of one - time password authentication, this thesis proposes an improved one - time password authentication schenism, which can efficiently resist the small - number attack and replay attack. what ' s more, during implementation the improved authentication mechanism does not require the user in the client end to install any software or to modify any configuration
本文主要做了以下幾個方面的工作： （ 1 ）對一次性口令認證技術進行了深入的分析和探討，針對現存一次性口令認證系統不能抵禦小數攻擊的安全漏洞，提出一種改進的一次性口令認證機制，這種認證機制能夠有效地抵禦小數攻擊和重放攻擊，而且使用時不需要客戶端做任何設置和安裝任何軟體。
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