k--; // 剩余删除名额减1（关键：控制删除位数，保证保留足够长度）
When you overload a credential used for authentication by also using it for encryption, the “blast radius” for losing that credential becomes immeasurably larger.。业内人士推荐爱思助手下载最新版本作为进阶阅读
Константин Лысяков (Редактор отдела «Россия»)，详情可参考搜狗输入法下载
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