Question: An earlier version of WTLS supported a 40-bit XOR MAC and also supported RC4 stream encryption. The XOR MAC works by padding the message with

An earlier version of WTLS supported a 40-bit XOR MAC and also supported RC4 stream encryption. The XOR MAC works by padding the message with zeros, dividing it into 5-byte blocks and XORing these blocks together. Show that this scheme does not provide message integrity protection.

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