Which of Purdue Information Security programs?

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Hello to you all. I am interested in applying for a PhD in Purdue University and I do not know about which of the two is better:

Applying for the Computer Science Dep. with information security as area of interest

or

Applying for the Interdisciplinary Information Security PhD program.

Does anyone know the differences between the two in terms of research level and fundings?

Thank you in advance for any advice