An organization needs to guarantee that employees cannot deny sending electronic documents they have authored. Which of the following technologies BEST fulfills this requirement?
Applying hashing algorithms to documents
Requiring strong authentication methods
Encrypting documents with a symmetric key
Implementing digital signatures
Digital signatures use asymmetric encryption to associate a sender's identity with a document uniquely. This provides non-repudiation by ensuring that the sender cannot deny authoring the document, and the recipient can verify its authenticity. Strong authentication verifies user identities but does not prevent users from denying their actions. Hashing ensures data integrity but does not link actions to specific users. Encryption protects data confidentiality but does not provide proof of the sender's identity.
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