I have an application for the decryption of pdf passwords for 128 bit Rc4 and 128 AES. In this, i am doing 50 times MD5 using an encryption key. Its working well with this approach. But in case of 256 bit AES password security, It creates problem. What is the difference between 128 bit AES and 256 bit AES algorithms ? Please tell me what are the algorithmic steps for 256 bit AES password security ??
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