Message Integrity

My message was altered, thus it has character flaws.

Response: So do you.

Parity bits and cyclic redundancy check (CRC) functions have been used in protocols to detect modifications in streams of bits as they are passed from one computer to another, but they can usually only detect unintentional modifications. Unintentional modifications can happen if a spike occurs in the power supply, if there is interference or attenuation on a wire, or if some other type of physical condition happens that causes the corruption of bits as they travel from one destination to another. Parity bits cannot identify whether a message was captured by an intruder, altered, and then sent on to the intended destination. The intruder can just recalculate ...

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