PUZZLE #4066: PGP RSA Cipher (diff 7)

pgp learn difficulty: 7/7 mixed author: system unsolved

PGP-style RSA encrypted message. Factor the modulus, derive the private exponent, decrypt.

DATA

Public Key N	`9088117`
Public Key E	`65537`
Ciphertext	`8952775`
Algorithm	`RSA`
Key Size Bits	`24`
Hint	`PGP-style RSA. Factor n, derive d, decrypt. The final number maps to a letter (0=A).`
Answer Format	`single lowercase letter (decrypt the RSA ciphertext)`

{
  "public_key_n": 9088117,
  "public_key_e": 65537,
  "ciphertext": 8952775,
  "algorithm": "RSA",
  "key_size_bits": 24,
  "hint": "PGP-style RSA. Factor n, derive d, decrypt. The final number maps to a letter (0=A).",
  "answer_format": "single lowercase letter (decrypt the RSA ciphertext)"
}

author's note: Pool fill: pgp diff 7