The RSA algorithm is an example of what type of cryptography

All three types of cryptography schemes have unique function mapping to specific．For example, the symmetric key approach （71） is typically used for the encryption of data providing（72）, whereas asymmetric key cryptography is maidy used in key（73）and nonrepudiation, thereby providing confidentiality and authentication． The hash（74）（noncryptic）, on the other hand, does not provide confidentiality but provides message integrity, and cryptographic hash algorithms provide message（75）and identity of peers during transport over insecure channels．

A. Cryptography
B.decode
C.privacy
D.security

（71）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。

（71）处的单词应是

A.Cryptography
B.Geography
C.Stenography
D.Steganography

All three types of cryptography schemes have unique function mapping to specific．For example,the symmetric key approach（ ）is typically used for the encryption of data providing（ ）,whereas asymmetric key cryptography is maidy used in key（ ）and nonrepudiation,thereby providing confidentiality and authentication．The hash（本题）（noncryptic）,on the other hand,does not provide confidentiality but provides message integrity,and cryptographic hash algorithms provide message（ ）and identity of peers during transport over insecure channels．

A.Algorithm
B.Secure
C.structure
D.encryption

All three types of cryptography schemes have unique function mapping to specific.For example,the synunetric key（71）approach is typically used for theencryption of data providmg（72）,whereas asymmetric key cryptography is maidy used in key（73）and noruepudiation,thereby providing confidentiality and authentication.The hash（74）（noncryptic）,on the other hand,does not provide confidentiality but provides messageintegrity,and cryptographic hash algorithms provide message（75）and identity of peers during transport over insecure channels.
请作答72题。

A.Conduction
B.confidence
C.confidentiality
D.connection

All three types of cryptography schemes have unique function mapping to specific．For example, the symmetric key approach （71） is typically used for the encryption of data providing（72）, whereas asymmetric key cryptography is maidy used in key（73）and nonrepudiation, thereby providing confidentiality and authentication． The hash（74）（noncryptic）, on the other hand, does not provide confidentiality but provides message integrity, and cryptographic hash algorithms provide message（75）and identity of peers during transport over insecure channels．

A.Algorithm
B.Secure
C.structure
D.encryption