Gone in Six Characters: Short URLs Considered Harmful for Cloud Services
<a href="http://arxiv.org/pdf/1604.02734v1.pdf" rel="nofollow">http://arxiv.org/pdf/1604.02734v1.pdf</a><p><a href="http://www.icir.org/vern/papers/monarch-oak11.pdf" rel="nofollow">http://www.icir.org/vern/papers/monarch-oak11.pdf</a>