2021年11月24日来源:信管网 作者:cnitpm
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信息安全工程师每日一练试题内容(2021/11/23)
试题1: 下列技术中,不能预防重放攻击的是()。 利用公开密钥算法进行数据加密时,采用的方法是()
A、发送方用公开密钥加密,接收方用公开密钥解密
B、发送方用私有密钥加密,接收方用私有密钥解密
C、发送方用公开密钥加密,接收方用私有密钥解密
D、发送方用私有密钥加密,接收方用公开密钥解密
在DES加密算法中,密钥长度和被加密的分组长度分别是()
A、56位和64位
B、56位和56位
C、64位和64位
D、64位和56位
依据国家信息安全等级保护相关标准,军用不对外公开的信息系统至少应该属于()
A、二级及二级以上
B、三级及三级以上
C、四级及四级以上
D、五级
WI-FI网络安全接入是一种保护无线网络安全的系统,WPA加密模式不包括()
A、WPA和WPA2
B、WPA-PSK
C、WEP
D、WPA2-PSK
(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
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