However, one computer security expert said that even an attack of this size did not necessarily have to be the work of a large or powerful group.

不过，一名计算机安全专家称，即使是这样大规模的攻击也不一定来自大型或有势力的组织。

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If the large message is primarily a collection of smaller business objects then the solution is to group the smaller objects into conglomerate objects less than 1mb in size.

如果大消息主要是一些小业务对象的集合，那么解决方案是将这些小对象组合为一些小于1 MB的组合对象。

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The proposed scheme can effectively resist coalition attacks, and the efficiency is also independent with the group size, which results that the scheme is fit for large groups.

提出的方案能有效抵制联合攻击，打开群签名的效率与群规模无关，因此非常适合于大群体。

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Group size for their two-hour tour varies and can be as large as 60 people because reservations are not required.

BBC: Walking London��s Olympic sights