首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
计算机
Symmetric-key cryptosystems use the ________ key for encryption and decryption of a message,though a message or group of message
Symmetric-key cryptosystems use the ________ key for encryption and decryption of a message,though a message or group of message
admin
2023-02-13
106
问题
Symmetric-key cryptosystems use the ________ key for encryption and decryption of a message,though a message or group of messages may have a different key than others.A significant disadvantage of symmetric ciphers is the key management necessary to use them securely.Each distinct pair of communicating parties must,ideally,share a different key,and perhaps each ciphertext exchanged as well.The number of keys required increases as the square of the number of network members,which very quickly requires complex key management schemes to keep them all straight and secret.The difficulty of securely establishing a secret ________between two communicating parties,when a secure channel doesn’t already exist between them,also presents a chicken—and—egg problem which is a considerable practical obstacle for cryptography users in the real world.
Whitfield Diffie and Martin Hellman,authors of the first paper on public—key cryptography.
In a groundbreaking 1 976 paper,Whitfield Diffie and Martin Hellman proposed the notion of public—key(also,more generally,called asymmetric key)cryptography in which two different but mathematically related keys are used——a public key and a private key.A public key system is so constructed that calculation of one key(the private key)is computationally infeasible ________ the other(the public key),even though they are necessarily related.Instead,both keys are generated secretly,as an interrelated pair.The historian David Kahn described public—key cryptography as “the most revolutionary new concept in the field since poly—alphabetic substitution emerged in the Renaissance”.
In public-key cryptosystems,the ________ key may be freely distributed,while its paired private key must remain secret.The public key is typically used for encryption,while the private or secret key is used for decryption.Diffie and Hellman showed that public-key cryptography was possible by presenting the Diffie—Hellman key exchange protocol.
In 1978,Ronald Rivest,Adi Shamir,and Len Adleman invented ________,another public—key system.
In 1997,it finally became publicly known that asymmetric key cryptography had been invented by James H.Ellis at GCHQ,a British intelligence organization,and that,in the early 1970s,both the Diffie—Hellman and RSA algorithms had been previously developed(by Malcolm J.Williamson and Clifford Cocks,respectively).
③
选项
A、from
B、in
C、to
D、of
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/nF0D777K
本试题收录于:
信息安全工程师上午基础知识考试题库软考中级分类
0
信息安全工程师上午基础知识考试
软考中级
相关试题推荐
在海滩旅游胜地的浅海游泳区的外延,设置渔网以保护在海水中游泳的度假者免遭鲨鱼的攻击的措施,一直受到环境保护人员的指责,因为设置的渔网每年不必要地杀死了成千上万的海生动物。然而,最近环境保护人员发现,埋在游泳区外延海底的通电电缆能够让鲨鱼远离该区域,同时对游
北京农业大学的教授在河北省推广柿树剪枝技术时,为了说服当地的群众,教授把一块柿树园一劈为二,除自然条件相同外,其他的条件包括施肥、灭虫、浇水、除草等都相同,不同的是:其中一块柿树园剪枝,而另一块不剪枝。到收获季节,剪枝的一块柿树园的产量比不剪枝的多三成以上
王先生要在自己家装修一个矩形水池(无盖),要求这个水池1米高,容积为4立方米,已知底面的装修价格为每平方米180元,侧面装修价格为每平方米90元,则该水池最低的装修成本为()元。
王先生租某超市中的一个摊位,租金采用阶梯法计算:月营业额:不超过5000元,不缴纳租金;月营业额大于5000元不超过8000元的部分按5%缴纳租金;月营业额大于8000元不超过10000元的部分按10%缴纳租金;月营业额大于10000元的部分按13%缴纳租
从5位男教师和4位女教师中选出3位教师,派到3个班担任班主任(每班1位班主任),要求这3位班主任中男、女教师都要有,则不同的选派方案共有()。
函数的定义域为()。
世界上没有放之四海而皆准的发展道路和发展模式,也没有一成不变的发展道路和发展模式。30年前,印有五角星和镰刀锤头的红旗在克里姆林宫上空悄然滑落,社会主义阵营“老大哥”消失,西亚北非地区陷入动荡。如今,中国共产党已然走过100年春秋,中国特色社会主义比任何时
2021年9月10日,第18届中国-东盟博览会和中国-东盟商务与投资峰会在广西南宁开幕。习近平主席致贺信表示,中国和东盟建立对话关系30年来,双方全方位合作不断深化,互为最大贸易伙伴,成为亚太区域最具活力的合作。本次会议的主题是()
马克思在《资本论》中指出:“资本来到世问,从头到脚,每个毛孔都滴着血和肮脏的东西。”因此,扩大再生产过程中的追加资本,一开始就没有一个价值原子不是由别人的无酬劳动产生的。这表明()
Here’sacommonscenariothatanynumberofentrepreneursfacetoday:you’retheCEOofasmallbusinessandthoughyou’remakin
随机试题
A.Bomtrager′s反应B.无色亚甲蓝显色试验C.Labat反应D.CuSO4反应E.Molish反应茜草素反应阳性的是
在AdobeIllustrator中,当使用其它放大镜工具时,若要临时切换为缩小镜工具,可按住下列哪个键?
国际企业的采购决策方式有()
简述债的担保的特征。
患者,男,65岁,全牙列缺失,一侧下颌舌骨嵴区有明显的倒凹,模型处理时错误的是
某学校食堂数十人在进食海虾后6小时陆续出现上腹部绞痛,大便为水样或血水样,体温37~39℃,你以为最可能是
背景某厂新建一条生产线,工期要求9月10日投产,因遇到“非典”时期,机械设备于7月28日才陆续到位,晚到45d,而且设备制造质量粗糙,造成施工安装单位一边进行设备安装,一边整修不规范设备。设备在试生产2个月后,密封装置性能较差。检查
下列选项中属于个人消费贷款的有()。
下列各项中,应作为职工薪酬计入相关资产成本的有()。
Howmenfirstlearnedtoinventwordsisunknown;【C1】______,theoriginoflanguageisamystery.Allwereallyknowisthatme
最新回复
(
0
)