I know monoalphabetic ciphers are weak, but my message recipient doesn't like taking the time for the decryption process. I've tried Vigenere, Gronsfeld, Beaufort and Digraphic Ciphers, but he doesn't decrypt them. What is a good choice for speed and enough security against novice cryptanalysts? One-Time-Pad is highly impractical, and Solitaire takes too much time, what is the best bet? Your suggested answer gives me systems that are impractical and slow. I don't need high security, merely simple yet strong ciphers not mentioned above.
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