In the figure, each character, both lowercase (plaintext) and uppercase (ciphertext) characters, is assigned an integer value mod26 (not ASCII). The encryption algorithm used is to add the text text value to the key used. Meanwhile, the decryption algorithm used is subtracting the ciphertext value from the key used. All values ​​are expressed in integer mod26 (0-25).   If key = 20 is used, encrypt the plaintext of your First Name

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