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I want to check whether a string is encrypted by RSA algorithm or not. This encryption checker must implemented in Kernel mode and worse than that it has to write in Win XP. I investigate OpenSSL and especially its RSA_public_decrypt but this function solely work in user mode and unfortunately I haven't saw the code. I supposed to verify a text with the given public key and signature. I don't want to implement it by scratch since I have to manipulate with multiply big numbers.

Any bit advice will be noticeable Sincerely yours

Karimai
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  • This question appears to be off-topic because it is about cryptographic analysis, and probably belongs on crypto.stackexchange.com. – jww Mar 30 '14 at 01:04

1 Answers1

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I want to check whether a string is encrypted by RSA algorithm or not...

Well, once its encrypted it should be indistinguishable from random data. That's known as the PRP-notion of security. So you should not be able to tell if its random, encrypted under AES, encrypted under RSA, etc.

I think the only thing you can say about the data is "its not encrypted" if the message is not random data.

jww
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