Using the wrong public key for encryption results in garbled output when attempting to decrypt the file.
When the client uses the wrong public key to encrypt a file before sending it to you, you would not be able to decrypt the file, so when you open it you will see garbled, nonsensical output. This is because a public key is only able to decrypt messages that have been encrypted using the corresponding private key. If the incorrect public key is used for encryption, the file becomes inaccessible, and decryption is not possible.
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