单项选择题
Regarding constructing a good encryption algorithm， what does creating an avalanche effect indicate？（）
A.Altering the key length causes the ciphertext to be completely different
B.Changing only a few bits of a ciphertext message causes the plain text to be completely different
C.Altering the key length causes the plain text to be completely different
D.Changing only a few bits of a plain-text message causes the ciphertext to be completely different
相关考题
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单项选择题
WhichitemiscorrectregardingCiscoIOSIPSonCiscoIOSRelease12.4（11）Tandlater？（）
A.requires the Basic or Advanced Signature Definition File
B.uses the built-in signatures that come with the Cisco IOS image as backup
C.supports SDEE，SYSLOG，and SNMP for sending Cisco IPS alerts
D.uses Cisco IPS 5.x signature format -
单项选择题
AfterenablingportsecurityonaCiscoCatalystswitch，whatisthedefaultactionwhentheconfiguredmaximumofallowedMACaddressesvalueisexceeded？（）
A.The port’s violation mode is set to restrict
B.The port is shut down
C.The MAC address table is cleared and the new MAC address is entered into the table
D.The port remains enabled， but bandwidth is throttled until old MAC addresses are aged out -
单项选择题
Streamciphersrunonwhichofthefollowing？（）
A.Fixed-length groups of digits called blocks
B.Individual blocks，one at a time，with the transformations varying during the encryption
C.Individual digits，one at a time，with the transformations varying during the encryption
D.Fixed-length groups of bits called blocks
