1.Explain the pros and cons of Fourier Transform?

2.How does Short Time Fourier Transform overcome the above cons?

3.Explain how the wavelet transform achieve a good time-frequency observation from filters' viewpoint?

4.Draw a 2D Discrete Wavelet Transform (DFT) decomposition figure. 1 level decomposition is enough.

5.Let's choose two primes: p= 3 and q = 11. Give the public key (n, e) and private key (n, d). If message m=2, give the encryption and decryption processes.