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XOR Encryption is a simple symmetric cipher in use in many applications where security is not a defined requirement. Exclusive-OR ( XOR ) encryption is almost unbreakable through brute force methods, although it is susceptible to patterns, it requires that both encryptor and decryptor have access to the encryption key, but the encryption algorithm although very simple is nearly unbreakable.

Events enable a class or object to notify other classes or objects when something of interest occurs. The class that sends (or raises) the event is called the dispatcher and the classes that receive (or handle) the event are called event listeners.

A cryptographic hash function is a procedure that takes in a variable amount of data and returns a fixed-size bit string known as the data' signature or hash value.Among the hash functions the most widely used is by far MD5, but currently it's days are numbered because of breakthroughs in cracking it.