Hello.
I am a student from the City University of Hong Kong. I want to realize a 
project about oblivious transfer. I have a problem that I used public_key_1 to 
encrypt a message and I want to use three private key to decrypt the 
ciphertext. Of course, private_key_1 could decrypt the ciphertext correctly. 
The private_key_2 and private_key_3 could not decrypt the ciphertext and return 
the ValueError "Encryption/decryption failed". But what I need is if the 
private key could not decrypt the ciphertext, it ought to return a random array 
not an error. How could I achieve my aim using the package Cryptography of 
Python? I would be deeply grateful if you could solve my problem. Thank you for 
your help!

Best Wishes!
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