In this mechanism, random encryption key, asymmetric encryption algorithm and one-time key for database encryption are used to ensure the key's safety in generation, storage, backup and recovery.

该机制通过非对称加密算法、随机密钥加密用户备份信息，以及“一次一密”加密数据库等手段有效解决传统密钥恢复机制在密钥产生、存储、备份、恢复过程中的安全问题。

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One-time key expansion was adopted.

密钥扩展采用一次性生成方式。

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And they got in this habit of, every time they had a bright, happy text, they'd set this in one kind of mode or key-- a major mode--and every time they had a sad one, they'd set it in minor.

于是人们养成了这样的习惯,每当人们书写欢乐,愉悦的歌词时,他们就设定一个调式或调性,即大调,每当人们书写忧伤的歌词时,他们就定为小调

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Were it not for some slight beveling between the keys, you'd have a hard time telling one key from the other without looking down at your fingers.

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One key: This time around oil prices have risen at a slower and more stable pace, says Hillard Huntington, director of the Energy Modeling Forum at Stanford University.

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At the same time, at least one key shareholder in BA is urging the airline to hold firm and refuse to give ground in the dispute.

BBC: BA branded 'brutish' as tempers fray