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This is bad practice for so many reasons. RC4 has been broken every which way since Sunday. Your key generation algorithm is home grown and may not be safe. Perhaps someone on crypto.stackexchange.com is willing to analyze it for you. I'd leave it behind and use a published KDF. There are known attacks against RC4 that involve subsequent derivations of a ...


RC4 is not considered as secure anymore, sice there are serveral security vulnerabities found in it. More about RC4 on Wikipedia ... Using the same password for all messages is also insecure, sice if the password is discovered, all messages are compromised. Using pattern like 100, 101, 102 will not add much security to it, since attacker can guess what will ...

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