Multiple choice

Which of the following algorithms is a symmetric-key cryptography algorithm?

  1. ElGamal cryptographic algorithm

  2. RSA algorithm

  3. IDEA algorithm

  4. Elliptic curve discrete logarithm

  5. Diffie-Hellman algorithm
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C Correct answer
Explanation

IDEA (International Data Encryption Algorithm) is a symmetric-key cryptography algorithm. IDEA operates on 64-bit blocks using a 128-bit key and consists of a series of eight identical transformations and an output transformation (the half-round).

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