साइबर सुरक्षा, IT नीति र विद्युतीय कारोबार ऐन – Cyber Security, IT Policy & ETA MCQ
साइबर सुरक्षा, IT नीति र विद्युतीय कारोबार ऐन – कम्प्युटर र IT
Cyber Security, IT Policy & ETA · Computer & IT (Technical) · ४०४ प्रश्न
४०४ प्रश्न उपलब्ध। मोड छान्नुहोस्:
साइबर सुरक्षा, IT नीति र विद्युतीय कारोबार ऐन: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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To verify a digital signature, the receiver uses the:
सही उत्तर: क) Sender's public key
The signature is made with the sender's private key and can be checked by anyone holding the sender's public key.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Message Authentication Code (MAC), such as HMAC, provides:
सही उत्तर: क) Integrity and authentication of the message using a shared secret key
An HMAC is computed with a secret key, so only key holders can create or verify it; it does not encrypt the message.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a good cipher or hash function, a small change in the input (even one bit) producing a large, unpredictable change in the output is called the:
सही उत्तर: घ) Avalanche effect
The avalanche effect ensures that similar inputs give completely different outputs, hiding patterns from attackers.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The property of a good hash function that makes it computationally infeasible to find two different inputs with the same hash is called:
सही उत्तर: ग) Collision resistance
Collision resistance prevents finding any two messages with equal digests; pre-image resistance prevents recovering an input from its hash.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The output (hash value) of the MD5 algorithm is how long?
सही उत्तर: ख) 128 bits
MD5 produces a 128-bit digest and is now considered broken for collision resistance; SHA-1 gives 160 bits.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Triple DES (3DES) improves on DES by:
सही उत्तर: क) Applying the DES algorithm three times with two or three different keys
3DES runs encrypt-decrypt-encrypt with multiple keys to raise effective strength, though it is now being phased out in favour of AES.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which key lengths are defined for AES?
सही उत्तर: घ) 128, 192 and 256 bits
AES always uses a 128-bit block but supports keys of 128, 192 or 256 bits (10, 12 or 14 rounds).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Blowfish and Twofish, both designed by Bruce Schneier, are examples of:
सही उत्तर: ख) Symmetric-key block ciphers
Blowfish (64-bit block) and Twofish (128-bit block) use the same secret key for encryption and decryption.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 'Digital Nepal Framework', prepared by Nepal's Ministry of Communication and Information Technology, is mainly:
सही उत्तर: घ) A roadmap of digital initiatives to use ICT for economic growth and better public services
The Digital Nepal Framework sets out sector-wise digital initiatives (e.g., agriculture, health, education, finance) to drive digital transformation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Nepal's National Information and Communication Technology (ICT) Policy was issued in the year (BS):
सही उत्तर: ग) 2072
The National ICT Policy, 2072 replaced the earlier IT Policy of 2057; 2063 is the year of the Electronic Transactions Act.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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