Description: Implement a simple encryption and decryption system requirements are as follows: (1) Enter the encrypted text, the length is not less than 30 letters (2) Enter the key length L and used to generate the key in English letters (number> = L ) Note: a valid key from the L (3 < = L < = 15) composed of a lower-case letters, at least one vowel letter ( ' a' , ' e' , ' i' , ' o' or ' u' ), at least two consonant letters (other than the removal of vowel letters). (3) Select encryption can encrypt the original text (4) Select decryption functions, can decrypt the ciphertext.
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