AES Symmetric Encryption Using Javascript and ColdFusion

This article is just a small demo on how to use the same AES symmetric encryption on the client-side (javascript) and the server-side (ColdFusion).

The goal is to generate a key on the server-side (for example each time a user logs in, when the session is created, a special key is generated and stored in the session), this key is then sent to the browser to encrypt form fields on the client-side which can then be sent encrypted to the server, where they can be decrypted again with the key from the session, to obtain the original values.

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For completeness, I will show both how to encrypt and decrypt on the serverside first, using ColdFusion, as well as how to encrypt and decrypt on the client-side, using javascript.

For the generation of the key, I decided to use the underlying jvm, because the native ColdFusion generateKey method doesn’t allow for the generation of an InitializationVector, which leads to weaker security.

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