问题 问答题 简答题

什么是基于时间同步、基于事件同步、挑战/应答式的非同步的认证技术?

答案

参考答案:

1、基于时间同步认证技术是把流逝的时间作为变动因子(60秒作为变化单位,用“滑动窗口”技术)。用户密钥卡和认证服务器所产生的密码在时间上必须同步。

2、基于事件同步认证技术是把变动的数字序列(事件序列)作为密码产生器的一个运算因子与用户的私钥共同产生动态密码。用户密钥卡和认证服务器保持相同的事件序列。

3、挑战/应答方式的变动因子是由认证服务器产生的随机数字序列(Challenge),它也是密码卡的密码生成的变动因子,由于每一个Challenge都是唯一的、不会重复使用,并且Challenge是在同一个地方产生,不需要同步。

单项选择题 A1/A2型题
单项选择题

Surprisingly enough, modern historians have rarely interested themselves in the history of the American South in the period before the South began to become self-consciously and distinctively " Southern"—the decades after 1815. Consequently, the cultural history of Britain’s North American empire in the seventeenth and eighteenth centuries has been written almost as if the Southern colonies had never existed. The American culture that emerged during the Colonial and Revolutionary eras has been depicted as having been simply an extension of New England Puritan culture.

However, Professor Davis has recently argued that the South stood apart from the rest of American society during this early period, following its own unique pattern of cultural development. The case for Southern distinctiveness rests_ upon two related premises: first, that the cultural similarities among the five Southern colonies were far more impressive than the differences, and second, that what made those colonies alike also made them different from the other colonies. The first, for which Davis offers an enormous amount of evidence, can be accepted without major recitations, the second is far more problematic.

What makes the second premise problematic is the use of the Puritan colonies as a basis for comparison. Quite properly,Davis decries the excessive influence ascribed by historians to the Puritans in the formation of American culture. Yet Davis inadvertently adds weight to such ascriptions by using the Puritans as the standard against which to assess the achievements and contributions of Southern colonials. Throughout, Davis focuses on the important and undeniable differences between the Southern and Puritan colonies in motives for and patterns of early settlement, in attitudes toward nature and Native Americans, and in the degree of receptivity to metropolitan cultural influences.

However, recent scholarship has ply suggested that those aspects of early New England culture that seem to have been most distinctly Puritan, such as the p religious orientation and the communal impulse, were not even typical of New England as a whole, but were largely confined to the two colonies of Massachusetts and Connecticut. Thus, what in contrast to the Puritan colonies appears to Davis to be peculiarly Southern-acquisitiveness. A p interest in polities and the law, and a tendency to cultivate metropolitan cultural models were not only more typically English than the cultural patterns exhibited by Puritan Massachusetts and Connecticut, but also almost certainly characteristic of most other early modern British colonies from Barbados north to Rhode Island and New Hampshire. Within the larger framework of American colonial life, then, not the Southern but the Puritan colonies appear to have been distinctive, and even they seem to have been rapidly assimilating to the dominant cultural patterns by the last Colonial period.

The most distinctly Puritan aspects of the early New England were typical for()

A. New England itself

B. England

C. Mississippi

D. Connecticut