Application: Encryption

Shift and affine ciphers built from linear congruence functions, then RSA, whose public and private key pair rests on hard factoring.

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3 exercises

Decrypt the following message, which was encrypted by the standard Caesar cipher: “L FDQ DOZDBV WUXVW BRX, EUXWXV.”

Apply the affine shift $e(x) = 7x + 11 \pmod{ 26 }$ to the string, “Encrypt me.”

Decrypt the text which was encrypted via the affine shift $e(x) = 7x + 11 \pmod{ 26 }$ : “LJNHFRN”