This similarity is a result of the fact that DCE authentication service was built upon the source code for Kerberos V5.

这种相似性源于这样一个事实：DCE身份验证服务建立在Kerberos V5的源代码之上。

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Google announced last week, for instance, that it will offer two-factor authentication on many of its online services, and may make the service open source and available to other companies.

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