I know beginners often screw up encryption, and I'm certainly a beginner so I'd like some feedback on my approach.I wrote a small PHP app to store passwords in a database for a group of sys admins ...

The java version is using TripleDES encryption in CBC mode with PKCS5 padding. From what I've read and seen on the web, mcrypt with PHP does not support PKCS5 padding.

This article covers the attack surface of application-layer encryption in the browser, how it is very different from native clients, and how WebCrypto helps.

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