公钥加密算法可用于数据完整性、数据保密性、发送者不可否认和 【27】 。
参考答案:发送者认证
Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (6) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (7) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (8) . As administrators seek to block dangerous email attachments through the recognition of well-known (9) , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users. Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (10) access to your network.
A.cracker
B.user
C.customer
D.client
诊断代谢性脑病的金指标为()
A.是否为弥漫性脑病
B.是否其他脑干功能受损而瞳孔反应正常
C.瞳孔反应是否失常
D.是否为结构性脑病
E.脑干功能是否受损