A digital signature is

Asked in GPSC Prelims CSP 2 2017 · Topic: Cyber Security and Cyber Crimes (Cyber Security Technologies and Countermeasures: Firewalls, Intrusion Detection/Prevention Systems (IDS/IPS), Encryption, VPNs, Antivirus, Multi-factor Authentication)

1. a file storing scanned signature
2. a QR code issued for transactions through mobile devices
3. a virtual payment address used in unified payments interface
4. a cryptographic method that supports non-re‐ pudiation

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