The most widely accepted and implemented approach to public-key encryption, is a block cipher in which the plaintext and ciphertext are integers between 0 and n - 1 for some n.

RSA

Explanation:

The most widely accepted and implemented approach to public-key encryption, RSA is a block cipher in which the plaintext and ciphertext are integers between 0 and n - 1 for some n.

The acronym RSA stands for  Rivest, Shamir, and Adelman, the people who invented the system. RSA is used for secure transmission of data

d.

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