CEH Practice Question: Advanced Topics: Wireless, Cloud, IoT, Cryptography

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

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  RSA

  Why this is correct

  RSA (Rivest-Shamir-Adleman) is a foundational asymmetric encryption algorithm that relies on the mathematical difficulty of factoring the product of two large prime numbers. It employs a distinct public key for encryption and a corresponding private key for decryption, enabling secure communication and digital signatures without prior key exchange. This public/private key pair structure is the defining characteristic of asymmetric cryptography, making it a correct example.

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  ECC

  Why this is correct

  Elliptic Curve Cryptography (ECC) is an advanced asymmetric encryption method that leverages the mathematics of elliptic curves over finite fields. ECC provides equivalent security strength to RSA with significantly smaller key sizes, which translates to faster computations and reduced resource consumption. This efficiency makes ECC particularly well-suited for mobile devices, constrained environments, and high-performance applications where bandwidth and processing power are critical, confirming its asymmetric nature.

• ✗

  3DES

  Why it's wrong here

  Triple Data Encryption Standard (3DES) is a symmetric block cipher, an enhancement of the original DES algorithm. It applies the DES encryption process three times to each data block, typically using two or three distinct keys, but crucially, the *same* key(s) are used for both encryption and decryption. This shared secret key mechanism fundamentally classifies 3DES as a symmetric cryptographic algorithm, not an asymmetric one.

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  MD5

  Why it's wrong here

  MD5 (Message-Digest Algorithm 5) is a widely known cryptographic hash function, not an encryption algorithm. Its primary purpose is to generate a fixed-size, unique hash value (or message digest) from an input of arbitrary length, primarily for data integrity verification. MD5 does not involve keys for encryption or decryption, nor can it be reversed to reconstruct the original data, distinguishing it entirely from both symmetric and asymmetric encryption.

• ✗

  AES

  Why it's wrong here

  The Advanced Encryption Standard (AES) is a highly secure and globally adopted symmetric block cipher. It operates by using a single, shared secret key for both the encryption of plaintext into ciphertext and the subsequent decryption of that ciphertext back into its original form. This reliance on a common secret key for both operations is the hallmark of symmetric cryptography, making AES distinct from public-key (asymmetric) systems.

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