【判断题】在同时使用了对称密码体制和非对称密码体制的密码系统中,如果选用了安全强度比较弱的对称密码体制,比如有效密钥长度为56比特的DES体制,为了确保安全性,非对称密码体制的安全强度就应该更强,比如选择2048bit的RSA公钥加密体制。
【单选题】Why is it not necessary to provide powered flight in space all the time? ______
A.
Few spacecrafts complete their flight operations.
B.
The Earth's gravity cannot be overcome.
C.
No further power is needed after the escape speed is reached.
D.
Free fall takes the place of the Earth's gravity pull.
【简答题】密码技术的分类有很多种,根据加密和解密所使用的密钥是否相同,可以将加密算法分为:对称密码体制和非对称密码体制,其中对称密码体制又可分为两类,按字符逐位加密的( )和按固定数据块大小加密的( )。
【单选题】Why is it not necessary to provide powered flight in space all the time?
A.
Few spacecrafts complete their flight operations.
B.
The Earth's gravity cannot be overcome.
C.
No future power is needed after the escape speed is reached.
D.
Free fall takes the place of the Earth's gravity pull.
【判断题】in this video, pink is perfect to be combined with poor materials and natural wood elements,bucause it can provide contrast and warmth in the space.
【简答题】密码体制有对称密钥密码体制和非对称密钥密码体制。而 密钥密码技术允许加密解密双方拥有不相同的密钥。
【单选题】在非对称密钥密码体制中,每个用户拥有一个密钥对,即公开密钥和私有密钥,其中
A.
私钥只能由持有人拥有,公钥可由持有人提供给所需要的用户
B.
只有使用该密码体制的用户才能使用公钥,而私钥只能由持有人所使用
C.
公钥可向所有网络用户开放,而私钥只能由持有人所拥有
D.
使用该密码体制的用户均有权使用公钥和私钥,但私钥必须由持有人授权方可使用
【单选题】在 TCP / IP 协议的传输层将数据传送给用户应用进程所使用的地址形式是
【单选题】Indicate the best answer for each question in the space provided. 1 The financial statements of a business entity:
A.
a Include the balance sheet, income statement, and income tax return.
B.
b Provide information about the profitability and financial position of the company.
C.
c Are the first step in the accounting process.
D.
d Are prepared for a fee by the Financial Accounting Standards Board.