A common mistake is to assume that encryption protects the cookies from tampering so that if any data in the cookie is modified, the cookie will not decrypt correctly. However, there are a lot of ways to make mistakes in crypto implementations, and when crypto breaks, it usually breaks badly.

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OSX Leopard ships with Subversion 1.4.x by default. Since then, SVN is now up to 1.6.12. To make things easy, there is a binary available at Collab.net. But unfortunately you need to do some work yourself.

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