From the course: CISSP Cert Prep (2021): 3 Security Architecture and Engineering

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The perfect encryption algorithm

The perfect encryption algorithm

From the course: CISSP Cert Prep (2021): 3 Security Architecture and Engineering

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The perfect encryption algorithm

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- [Narrator] Wouldn't it be nice if someone would invent a perfect encryption algorithm that's unbreakable. Well someone already did. And it was more than a hundred years ago. The one-time pad invented by a Telegraph expert in 1882 is an unbreakable encryption algorithm. And using the one-time pad is pretty straightforward. The sender and receiver each have a copy of identical pads containing strings of random letters. The pad length must be as long as the total of the characters of all of the messages that the sender and receiver will exchange. Let's try an example ourselves. Here's what one page of key material in the one-time pad might look like. The sender writes the characters or the plain text message on the pad like this. Will say that my message is the word secret. The sender then adds together the characters of the message and the characters of the key, treating them as numbers. A is the first letter of the…

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