OAEP

Why
OAEP is important because it allows us to achieve data integrity without source identification

What
OAEP is an asymmetric RSA data integrity scheme that works opposite to the RSA digital signature scheme. This means we should reverse the roles of the encryption key and the verificatio n keys

How

 * 1) Pad the original message with zeroes and encrypt it using the RSA scheme
 * 2) If the ciphertext has not been changed, then the receiver will receive a string with zeroes padded at the end
 * 3) If the ciphertext has been changed, then there is no way to ensure that there are a string of zeroes padded at the end.
 * 4) Therefore, the receiver knows that if the resulting plaintext string has zeroes at the end, then it was from a valid sender with overwhelming probability according to $$1-2^{-k}$$ where k is the number of zeroes padded at the end