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信息安全工程师每日一练试题内容(2020/11/27)
试题1: 2017年11月,在德国柏林召开的第55次ISO/IEC信息安全分技术委员会(SC27)会议上,我国专家组提出的( )算法一致通过成为国际标准。 (1)is the science of hiding information. Whereas the goal of cryptography is to make data unreadable by a third party. the goal of steganography is to hide the data from a third party. In this article, I will discuss what steganography is, what purposes it serves, and will provide an example using available software.
There are a large number of steganographic (2)that most of us are familiar with (especially if you watch a lot of spy movies), ranging from invisible ink and microdots to secreting a hidden message in the second letter of each word of a large body of text and spread spectrum radio communication. With computers and networks, there are many other ways of hiding informations, such as:
Covert channels (c,g, Loki and some distributed denial-of-service tools use the Internet Control (3)Protocol, or ICMP, as the communication channel between the “bad guy”and a compromicyed system)
Hidden text within Web pages
Hiding files in “plain sight”(c,g. what better place to “hide”a file than with an important sounding name in the c:\winnt system32 directory)
Null ciphers(c,g, using the first letter of each word to form a hidden message in an otherwise innocuous text)
steganography today, however, is significantly more (4)than the example about suggest, allowing a user to hide large amounts of information within image and audio. These forms of steganography often are used in conjunction with cryptography so the information is double protected; first it is encrypted and then hidden so that an advertisement first. find the information ( an often difficult task in and of itself) and the decrypted it.
The simplest approach to hiding data within an image file is called (5)signature insertion. In this method, we can take the binary representation of the hidden data and the bit of each byte within the covert image. If we are using 24-bit color the amount and will be minimum and indiscriminate to the human eye.
(1)A、Cryptography
B、Geography
C、Stenography
D、Steganography
(2)A、methods
B、software
C、tools
D、services
(3)A、Member
B、Management
C、Message
D、Mail
(4)A、powerful
B、sophistication
C、advanced
D、easy
(5)A、least
B、most
C、much
D、less
以下关于数字证书的叙述中,错误的是()
A、证书通常由CA安全认证中心发放
B、证书携带持有者的公开密钥
C、证书的有效性可以通过验证持有者的签名
D、证书通常携带CA的公开密钥
设在RSA的公钥密码体制中,公钥为(c,n)=(13,35),则私钥为()
A、11
B、13
C、15
D、17
来自终端的电磁泄露风险,因为它们:()
A.导致噪音污染
B. 破坏处理程序
C. 产生危险水平的电流
D. 可以被捕获并还原
下列说法中,错误的是()
A、服务攻击是针对某种特定攻击的网络应用的攻击
B、主要的渗入威胁有特洛伊木马和陷阱
C、非服务攻击是针对网络层协议而进行的
D、对于在线业务系统的安全风险评估,应采用最小影响原则
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