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Verification of RSA Encryption (From NHK’s “Math Without Laughter,” Cryptography Theory)

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I will verify the RSA cipher that appeared in the NHK program *Cryptography in "Math Without Laughter,"* featuring Mr. Ogata of Panther.
RSA stands for Rivest-Shamir-Adleman.
It can be used for both decryption and encryption. As an example, you can verify the problem that appeared at the end of *Math Without Laughter*.
References: Introduction to Cryptography, 3rd Edition; Alice in the Land of Secrets by Hiroshi Yuki
Encryption and Decryption
Prime number p
Not published. Only N = p × q is published.
Prime number q
Not published. Only N = p × q is published.
Public Key
It will be published. The "L" and "素" below
Encrypted numbers
N =p×q will be published.
L The public key must be a prime number.
Private Key Not published
Encrypted or decrypted numbers 

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