function selectCipherStrategy(key) {
	                if (typeof key == 'string') {
	                    return PasswordBasedCipher;
	                } else {
	                    return SerializableCipher;
	                }
	            }
Creates shortcut functions to a cipher's object interface.

@param {Cipher} cipher The cipher to create a helper for.

@return {Object} An object with encrypt and decrypt shortcut functions.

@static

@example

    var AES = CryptoJS.lib.Cipher._createHelper(CryptoJS.algo.AES);