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Slow image encryption / decryption on Android

I have already implemented encryption / decryption between php and android using AES / CBC.

However, when I decrypt the images using an Android phone, for a 300k file it will always take more than 1 second. How to speed up decryption? Thank you very much!

PS: I use mCrypt extensionto encrypt php and javax.crypto.Cipherto decrypt android. I mean, can I use another cryto mode or another mode?

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Source: https://habr.com/ru/post/1547729/

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