Show that plain RSA is malleable. Discuss if AES and RSA-OAEP are malleable.

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Show that plain RSA is malleable. Discuss if AES and RSA-OAEP are malleable.

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Answer 1

Answer #1

1. Plain RSA encryption is malleable because it can be changed.

Suppose A sends ciphertext c to B, but it is intercepted and changed to c’ by Eve.
Bob decrypts –> m’ = c’ * d mod n
This is not the message sent by Alice.

If there could be a special structure for m then only it can be detected

Thus it is proved that the RSA encryption is malleable

2. RSA-OAEP is not malleable, this is the reason Plain RSA is used along with this in order to make it more secure whereas AES is malleable.

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Answer 2

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Show that plain RSA is malleable. Discuss if AES and RSA-OAEP are malleable.

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