Your function expects a HashMap whose keys are the names of the services and whose values are the count of how many times the service occurs in the FriendFeed.
您的函数要求HashMap的键是服务的名称，其值为服务在FriendFeed中出现的次数。
To overcome the weakness of too many keys, we present an improvement of their signature scheme by getting rid of the one-way Hash function.
为了克服其方案密钥量大的缺陷，通过去掉单向哈希函数，给出1个改进方案。
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