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What would be the purpose of someone using their private key to encrypt a document, and sending that document to another person. Select all that apply.
Nonrepudiation
Availability
Confidentiality
Integrity
Someone who uses their private key to encrypt is not interested in confidentiality, as anyone with their public key can decrypt the document. Encryption does not ensure availability. Nonrepudiation is correct, as successful decryption with their public key proves that the owner of the private key is the author. Integrity is also ensured, as the encrypted document cannot be tampered with, while also ensuring a successful decryption with the public key.
Edit: no MD is there, hence no integrity may be guaranteed. According to your logic, any encrypted message will provide integrity which is simply flawed. Revise the Question or only non-repudiation is the possible answer. Think about replay attack. Revise the way to create a digital signature. This is a level 10 question and the answer commits such a mistake is disappointing. Skillset please have a look. *** Alas, the quality of these questions/answers seem inversely proportional to the (so-called) skill level. :(
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