Please answer number 3. Thank you.

(25 points) The following ciphertext was encrypted using a Playfair Cipher. Please derive the letter frequency table and see whether you can decrypt the ciphertext. What conclusion can you draw by comparing Problem 1 and Problem 3? 3. RCKTAS NNZQKL DH VXRRNFU, OQATCEV SDBMFZNZR MR PSEIPMDONBA RTZG KFRNKSPAZV. VNK QSGKBTQ LN PXIMTHGSIMFC VDBMFZNZR MFQU AFQFATZNZR MR KBEEAU NTAFQFATNBTZ DQ NTAPVSRNUH; QNA TCZATTB QSGKBTQ LN PXIMTHGSIMFC FFRNKSPAZR NTZG QDBMFZNZR MR KBEEAU UAAFQFATNBTZ DQ UAAPVSRNUH. KLON ABZRY (25 points) The following ciphertext was encrypted using a simple substitution. Try to find the original plaintext. Briefly show your work. 1. GBMHCFQBJHKM DI CKA IGDAEGA JEL ICVLM FP IAGBAC TBDCDEQ. J GDHKAB DI J GDHKABCARC DECF HNJDECARC DI GJNNAL LAGDHKABOAEC FB LAGBMHCDFE. SFCK AEGDHKABOAEC JEL LAGDHKABOAEC JBA GFECBFNNAL SM J GBMHCFQBJHKDG UAM FB UAMI (25 points) The following ciphertext was encrypted using a Playfair Cipher. Please derive the letter frequency table and see whether you can decrypt the ciphertext. What conclusion can you draw by comparing Problem 1 and Problem 3? 3. RCKTAS NNZQKL DH VXRRNFU, OQATCEV SDBMFZNZR MR PSEIPMDONBA RTZG KFRNKSPAZV. VNK QSGKBTQ LN PXIMTHGSIMFC VDBMFZNZR MFQU AFQFATZNZR MR KBEEAU NTAFQFATNBTZ DQ NTAPVSRNUH; QNA TCZATTB QSGKBTQ LN PXIMTHGSIMFC FFRNKSPAZR NTZG QDBMFZNZR MR KBEEAU UAAFQFATNBTZ DQ UAAPVSRNUH. KLON ABZRY (25 points) The following ciphertext was encrypted using a simple substitution. Try to find the original plaintext. Briefly show your work. 1. GBMHCFQBJHKM DI CKA IGDAEGA JEL ICVLM FP IAGBAC TBDCDEQ. J GDHKAB DI J GDHKABCARC DECF HNJDECARC DI GJNNAL LAGDHKABOAEC FB LAGBMHCDFE. SFCK AEGDHKABOAEC JEL LAGDHKABOAEC JBA GFECBFNNAL SM J GBMHCFQBJHKDG UAM FB UAMI