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Which of the following cipher requires only one key for decoding the ciphered text?

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Which of the following cipher requires only one key for decoding the ciphered text?

(a) Affine cipher

(b) RSA

(c) DSA

(d) PKCS

I have been asked this question during an interview for a job.

Question is from Cryptography in division Cryptography of Data Structures & Algorithms II

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Correct answer is (a) Affine cipher

For explanation: Asymmetric cipher makes use of 2 keys for the purpose of encryption. As affine cipher is the only symmetric cipher out of the given options so it requires only one key.

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