司(si)空(kong)在(zai)邮(you)(you)(you)件加密(mi)功能(neng)模块中，有(you)着特别之处，无论是(shi)企(qi)业(ye)(ye)邮(you)(you)(you)箱(xiang)还(hai)是(shi)个(ge)人邮(you)(you)(you)箱(xiang)都需(xu)要绑定对(dui)应邮(you)(you)(you)箱(xiang)账(zhang)(zhang)(zhang)号。在(zai)应用中点(dian)击(ji)“我的(de)”，找到邮(you)(you)(you)箱(xiang)设置(zhi)“添加账(zhang)(zhang)(zhang)户”字样(yang)按钮(niu)点(dian)击(ji)进(jin)入(ru)，可(ke)(ke)以(yi)看到页面显示出可(ke)(ke)绑定的(de)邮(you)(you)(you)箱(xiang)有(you)：网易(yi)企(qi)业(ye)(ye)邮(you)(you)(you)箱(xiang)、阿里(li)邮(you)(you)(you)箱(xiang)、腾(teng)讯(xun)企(qi)业(ye)(ye)邮(you)(you)(you)箱(xiang)、163网易(yi)邮(you)(you)(you)箱(xiang)、126网易(yi)邮(you)(you)(you)箱(xiang)、QQ邮(you)(you)(you)箱(xiang)及(ji)其他(ta)邮(you)(you)(you)箱(xiang)。选择对(dui)应的(de)邮(you)(you)(you)箱(xiang)服(fu)务商，其中前面三个(ge)是(shi)企(qi)业(ye)(ye)邮(you)(you)(you)箱(xiang)，后(hou)面三个(ge)是(shi)个(ge)人邮(you)(you)(you)箱(xiang)。企(qi)业(ye)(ye)邮(you)(you)(you)箱(xiang)设置(zhi)只需(xu)输(shu)入(ru)邮(you)(you)(you)箱(xiang)账(zhang)(zhang)(zhang)号和邮(you)(you)(you)箱(xiang)密(mi)码即可(ke)(ke)。个(ge)人邮(you)(you)(you)箱(xiang)设置(zhi)需(xu)要输(shu)入(ru)邮(you)(you)(you)箱(xiang)账(zhang)(zhang)(zhang)号和邮(you)(you)(you)箱(xiang)授权码，输(shu)入(ru)完成后(hou)点(dian)击(ji)登录即可(ke)(ke)完成邮(you)(you)(you)箱(xiang)绑定，聊天和邮(you)(you)(you)件的(de)加密(mi)功能(neng)就可(ke)(ke)以(yi)正(zheng)常使(shi)用了(le)。邮(you)(you)(you)件加密(mi)可(ke)(ke)以(yi)确保邮(you)(you)(you)件内(nei)容在(zai)传输(shu)过程(cheng)中不被(bei)篡改或窃取(qu)。用AES256给邮(you)(you)(you)件加密(mi)文件格式(shi)

对(dui)称(cheng)(cheng)加(jia)(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)的(de)(de)原(yuan)理：为了(le)保护(hu)用(yong)(yong)户(hu)的(de)(de)数(shu)(shu)据(ju)(ju)(ju)(ju)(ju)不被第三(san)(san)(san)双(shuang)(shuang)(shuang)眼睛偷窥，需(xu)要(yao)将用(yong)(yong)户(hu)的(de)(de)数(shu)(shu)据(ju)(ju)(ju)(ju)(ju)在(zai)离开网(wang)卡之前(qian)加(jia)(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)处理，将用(yong)(yong)户(hu)的(de)(de)明文(wen)(wen)(wen)(wen)数(shu)(shu)据(ju)(ju)(ju)(ju)(ju)加(jia)(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)成密(mi)(mi)(mi)(mi)(mi)(mi)(mi)文(wen)(wen)(wen)(wen)数(shu)(shu)据(ju)(ju)(ju)(ju)(ju)，密(mi)(mi)(mi)(mi)(mi)(mi)(mi)文(wen)(wen)(wen)(wen)数(shu)(shu)据(ju)(ju)(ju)(ju)(ju)尽管(guan)还是(shi)(shi)0、1二进制(zhi)(zhi)流，但是(shi)(shi)这些(xie)二进制(zhi)(zhi)流，即使还原(yuan)成ASCII码，也(ye)是(shi)(shi)一(yi)堆毫无(wu)意(yi)义的(de)(de)字(zi)符(fu)串(chuan)，毫无(wu)用(yong)(yong)处。上文(wen)(wen)(wen)(wen)提到(dao)了(le)第三(san)(san)(san)双(shuang)(shuang)(shuang)眼睛，那么前(qian)两(liang)双(shuang)(shuang)(shuang)眼睛分别是(shi)(shi)谁呢？是(shi)(shi)明文(wen)(wen)(wen)(wen)数(shu)(shu)据(ju)(ju)(ju)(ju)(ju)的(de)(de)发送(song)者(zhe)和密(mi)(mi)(mi)(mi)(mi)(mi)(mi)文(wen)(wen)(wen)(wen)数(shu)(shu)据(ju)(ju)(ju)(ju)(ju)的(de)(de)接(jie)收(shou)者(zhe)。由于接(jie)收(shou)者(zhe)有(you)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)文(wen)(wen)(wen)(wen)的(de)(de)解(jie)(jie)除加(jia)(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)钥(yao)(yao)，可以将密(mi)(mi)(mi)(mi)(mi)(mi)(mi)文(wen)(wen)(wen)(wen)还原(yuan)成明文(wen)(wen)(wen)(wen)，被称(cheng)(cheng)为阅读(du)明文(wen)(wen)(wen)(wen)数(shu)(shu)据(ju)(ju)(ju)(ju)(ju)的(de)(de)第二双(shuang)(shuang)(shuang)眼睛。第三(san)(san)(san)双(shuang)(shuang)(shuang)眼睛是(shi)(shi)谁？任何(he)有(you)机(ji)会看(kan)(kan)到(dao)、或捕(bu)获到(dao)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)文(wen)(wen)(wen)(wen)数(shu)(shu)据(ju)(ju)(ju)(ju)(ju)的(de)(de)人，都可以认为是(shi)(shi)第三(san)(san)(san)双(shuang)(shuang)(shuang)眼睛。由于第三(san)(san)(san)双(shuang)(shuang)(shuang)眼睛的(de)(de)人没有(you)解(jie)(jie)除加(jia)(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)钥(yao)(yao)，所以无(wu)法还原(yuan)出明文(wen)(wen)(wen)(wen)数(shu)(shu)据(ju)(ju)(ju)(ju)(ju)，自然就没法看(kan)(kan)明文(wen)(wen)(wen)(wen)数(shu)(shu)据(ju)(ju)(ju)(ju)(ju)。在(zai)网(wang)络安全(quan)领域，经常(chang)称(cheng)(cheng)第三(san)(san)(san)双(shuang)(shuang)(shuang)眼睛的(de)(de)人为第三(san)(san)(san)方(fang)。将明文(wen)(wen)(wen)(wen)数(shu)(shu)据(ju)(ju)(ju)(ju)(ju)与加(jia)(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)钥(yao)(yao)做一(yi)次(ci)(ci)加(jia)(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)操作，将密(mi)(mi)(mi)(mi)(mi)(mi)(mi)文(wen)(wen)(wen)(wen)数(shu)(shu)据(ju)(ju)(ju)(ju)(ju)与解(jie)(jie)除加(jia)(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)钥(yao)(yao)做一(yi)次(ci)(ci)解(jie)(jie)除加(jia)(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)操作，由于加(jia)(jia)(jia)(jia)/操作方(fang)法完全(quan)一(yi)样，并(bing)且(qie)加(jia)(jia)(jia)(jia)/密(mi)(mi)(mi)(mi)(mi)(mi)(mi)钥(yao)(yao)也(ye)完全(quan)一(yi)样，故(gu)称(cheng)(cheng)这种(zhong)数(shu)(shu)据(ju)(ju)(ju)(ju)(ju)发送(song)方(fang)、数(shu)(shu)据(ju)(ju)(ju)(ju)(ju)接(jie)收(shou)方(fang)共享会话密(mi)(mi)(mi)(mi)(mi)(mi)(mi)钥(yao)(yao)，并(bing)且(qie)共同使用(yong)(yong)会话密(mi)(mi)(mi)(mi)(mi)(mi)(mi)钥(yao)(yao)来完成加(jia)(jia)(jia)(jia)/操作的(de)(de)方(fang)法为对(dui)称(cheng)(cheng)加(jia)(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)。一(yi)次(ci)(ci)一(yi)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)的(de)(de)邮件加(jia)(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)复(fu)杂(za)吗一(yi)款好的(de)(de)邮件加(jia)(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)(mi)工(gong)具，不会改(gai)变用(yong)(yong)户(hu)对(dui)原(yuan)有(you)邮箱的(de)(de)使用(yong)(yong)习惯。

电(dian)子邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)系统(tong)包括(kuo)3个重要的(de)(de)代(dai)理，分别是：邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)用户(hu)代(dai)理、邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)传(chuan)输(shu)代(dai)理和邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)投递(di)(di)代(dai)理。邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)用户(hu)代(dai)理（MailUserAgent，简称MUA），用于(yu)(yu)编辑和发(fa)(fa)送(song)(song)邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)，以及从(cong)服务器中下载(zai)邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)、管理邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)、阅读邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)等。邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)传(chuan)输(shu)代(dai)理（MailTransferAgent，简称MTA），用于(yu)(yu)传(chuan)输(shu)、转(zhuan)发(fa)(fa)信件(jian)(jian)(jian)(jian)(jian)。此外，MTA也(ye)提(ti)供邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)存储功能(neng)。邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)投递(di)(di)代(dai)理（MailDeliveryAgent，简称MDA），用于(yu)(yu)将MTA发(fa)(fa)送(song)(song)过来的(de)(de)邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)投递(di)(di)到收(shou)(shou)(shou)件(jian)(jian)(jian)(jian)(jian)人的(de)(de)邮(you)(you)(you)(you)箱(xiang)中。在(zai)电(dian)子邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)传(chuan)输(shu)过程中，MUA接收(shou)(shou)(shou)用户(hu)投递(di)(di)的(de)(de)邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)，再将邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)发(fa)(fa)送(song)(song)给(ji)MTA。MTA接收(shou)(shou)(shou)到邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)之后，将邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)发(fa)(fa)送(song)(song)给(ji)其他中转(zhuan)MTA，再发(fa)(fa)送(song)(song)到收(shou)(shou)(shou)件(jian)(jian)(jian)(jian)(jian)方的(de)(de)MDA。MDA接收(shou)(shou)(shou)邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)之后，将邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)发(fa)(fa)送(song)(song)给(ji)收(shou)(shou)(shou)件(jian)(jian)(jian)(jian)(jian)方的(de)(de)MUA，收(shou)(shou)(shou)件(jian)(jian)(jian)(jian)(jian)方的(de)(de)MUA接收(shou)(shou)(shou)到邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)之后，投递(di)(di)给(ji)收(shou)(shou)(shou)件(jian)(jian)(jian)(jian)(jian)方。在(zai)这(zhei)个传(chuan)输(shu)过程中呢，会用到多个电(dian)子邮(you)(you)(you)(you)件(jian)(jian)(jian)(jian)(jian)协(xie)议(yi)，常用的(de)(de)就(jiu)是SMTP协(xie)议(yi)、POP3/IMAP协(xie)议(yi)。

《中华人民(min)共和国数据(ju)安(an)(an)全法(fa)(fa)》于2021年(nian)6月(yue)10日(ri)通过，自2021年(nian)9月(yue)1日(ri)开始施行。其(qi)中“数据(ju)”二(er)字，指的(de)(de)是任(ren)何电子或(huo)其(qi)他方式对信息的(de)(de)记(ji)录。国家(jia)保护(hu)个人、组织与数据(ju)有(you)关的(de)(de)权益，鼓励数据(ju)依法(fa)(fa)合理有(you)效地利用，保障数据(ju)依法(fa)(fa)有(you)序(xu)自由流动，促(cu)进以数据(ju)为关键要素的(de)(de)数字经(jing)济发展。司空应用软件作为一(yi)款加密工具(ju)，设计初衷就是为了(le)保护(hu)个人的(de)(de)隐(yin)私(si)及数据(ju)在第三(san)方服(fu)务(wu)器的(de)(de)安(an)(an)全，充分响应了(le)号召，为个人或(huo)企业数据(ju)安(an)(an)全保驾护(hu)航，贡献一(yi)份力(li)量(liang)。司空邮件加密功能使用的(de)(de)加密密钥是“量(liang)子真随机密钥”。

在密(mi)(mi)(mi)(mi)(mi)(mi)码学中，分(fen)组加(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)（英语：Block cipher），又被称分(fen)块(kuai)加(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)或块(kuai)密(mi)(mi)(mi)(mi)(mi)(mi)码，是一(yi)种对(dui)(dui)称密(mi)(mi)(mi)(mi)(mi)(mi)钥(yao)(yao)算法。它(ta)是将(jiang)明(ming)文(wen)分(fen)成多个等长的(de)模(mo)块(kuai)（block），再使用(yong)(yong)确(que)定的(de)算法和(he)对(dui)(dui)称密(mi)(mi)(mi)(mi)(mi)(mi)钥(yao)(yao)对(dui)(dui)每组分(fen)别加(jia)(jia)(jia)/处理。分(fen)组加(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)是极(ji)其(qi)重要的(de)加(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)协(xie)议组成，其(qi)中一(yi)条安全性原则就是打乱密(mi)(mi)(mi)(mi)(mi)(mi)文(wen)、明(ming)文(wen)、密(mi)(mi)(mi)(mi)(mi)(mi)钥(yao)(yao)之间(jian)的(de)依赖关(guan)系,即使敌手获得密(mi)(mi)(mi)(mi)(mi)(mi)文(wen)和(he)明(ming)文(wen)的(de)统(tong)计规律，也无(wu)法求出密(mi)(mi)(mi)(mi)(mi)(mi)钥(yao)(yao)，应用(yong)(yong)领域从电子(zi)邮件(jian)(jian)加(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)到银行交易(yi)转(zhuan)帐，可以(yi)说是非(fei)常之广(guang)。司空邮件(jian)(jian)加(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)就是采(cai)用(yong)(yong)了这种对(dui)(dui)称加(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)的(de)方式。邮件(jian)(jian)加(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)可以(yi)保护商业机密(mi)(mi)(mi)(mi)(mi)(mi)、个人隐私(si)和(he)其(qi)他敏感信息(xi)。安卓邮件(jian)(jian)加(jia)(jia)(jia)密(mi)(mi)(mi)(mi)(mi)(mi)工(gong)具(ju)

司空基(ji)于电子邮(you)箱的加密聊天功能(neng)使用(yong)更便(bian)捷。用(yong)AES256给(ji)邮(you)件加密文件格(ge)式

轻松三步，开(kai)启(qi)司空(kong)之旅。注册后领取体(ti)验(yan)会员(yuan)，开(kai)启(qi)专属畅快体(ti)验(yan)；成(cheng)(cheng)为会员(yuan)后请先设置盒子(zi)6位密(mi)(mi)码(ma)，进入后可以(yi)对本地文件(jian)(jian)(jian)进行加(jia)/操(cao)作，任意文件(jian)(jian)(jian)随(sui)心锁，存(cun)储(chu)分享安心放；解(jie)锁邮(you)(you)件(jian)(jian)(jian)加(jia)密(mi)(mi)功能，请先绑定电子(zi)邮(you)(you)箱(xiang)(xiang)(xiang)，可以(yi)是企业邮(you)(you)箱(xiang)(xiang)(xiang)，也可以(yi)是个(ge)人邮(you)(you)箱(xiang)(xiang)(xiang)，让信(xin)(xin)息安全流动。应邮(you)(you)箱(xiang)(xiang)(xiang)服(fu)务(wu)商要求，个(ge)人邮(you)(you)箱(xiang)(xiang)(xiang)需使用授权(quan)码(ma)登(deng)(deng)录(lu)，授权(quan)码(ma)获(huo)取方法如(ru)下（以(yi)163邮(you)(you)箱(xiang)(xiang)(xiang)示例）：登(deng)(deng)录(lu)163邮(you)(you)箱(xiang)(xiang)(xiang)，进入设置界面；点击IMAP/SMTP服(fu)务(wu)“开(kai)启(qi)”按钮；“开(kai)启(qi)”后弹(dan)出窗(chuang)口，点击“继续(xu)开(kai)启(qi)”；发送(song)短(duan)(duan)信(xin)(xin)验(yan)证，短(duan)(duan)信(xin)(xin)发送(song)成(cheng)(cheng)功后，点击“我已发送(song)”；生成(cheng)(cheng)授权(quan)码(ma)。用AES256给邮(you)(you)件(jian)(jian)(jian)加(jia)密(mi)(mi)文件(jian)(jian)(jian)格式

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