I have a symmetric key which can be used to encrypt plaintext and decrypt the resulting ciphertext.
I use it to encrypt a plaintext which is a copy of the aforementioned key.
My adversary gets a copy of the resulting ciphertext.
Assuming my adversary knows that the plaintext is a copy of the key, is there a way they can guess my key more easily than if the plaintext wasn't the key?
Note: I am new to cryptography so if there is a flaw in my question I will be happy to clarify.