From the course: ISC2 Systems Security Certified Practitioner (SSCP) (2024) Cert Prep

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The perfect encryption algorithm

The perfect encryption algorithm

From the course: ISC2 Systems Security Certified Practitioner (SSCP) (2024) Cert Prep

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The perfect encryption algorithm

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- [Instructor] 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 100 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 straight forward. 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 of the plain text message on the pad like this. We'll 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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