Question: An RSA cryptosystem has public key N = 35 and e = 7. Messages are encrypted one letter at a time, converting letters to numbers

An RSA cryptosystem has public key N = 35 and e = 7. Messages are encrypted one letter at a time, converting letters to numbers by A = 2, B = 3, ..., Z = 27, space = 28

(d) Even if a good choice of N and e is made, the method of encrypting one letter at a time has weaknesses. Describe how we might find the plaintext if a very long ciphertext is given.

(e) Eve intercepts the RSA message 365, 0, 4845, 14930, 2608, 2608, 0 sent from Alice to Bob. Alice and Bob are not using the scheme above. How does it seem they are converting letters to numbers? Decrypt the message.

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