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I'm thinking about building an app that lets users upload images to sites like Flickr. They would need to enter their password to do this. I would send the data through PHP, do I need to get a SSL certificate for that?

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It could be done without, just like I could juggle knives. The answer is yes, you need SSL. – Adjam Mar 4 '12 at 16:30
up vote 3 down vote accepted

You need a certificate if you will use HTTPS encrypting the traffic. Since you are requiring a login I would say that it will be necessary (not technically but sending the information in clear is not a good option).

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