Ciphers and Codes Of Interest Video

Perfect Secrecy With the One Time Pad

The one-time pad encryption method provides perfect secrecy at the cost of key size and key handling.

The above video is a quick and simple explanation of a simple one time pad by Khan Academy. The video shows how one-time pads are used to create unbreakable messages. The one-time pad exhibits perfect secrecy, but at the cost of a key the same size as the message. The key must never be reused and must be destroyed by both the sender and receiver once the message has been decrypted.

Here is a more in depth explanation from the CompTIA Security+ course.

And another explanation from


About Anna Nyms

Anna Nyms loves to write about numbers and what can be done with them. She is an advocate for privacy and stronger online security. Her interests are encryption, privacy, hacking, and programming. Anna currently lives in Huntsville, Alabama with her husband and young daughter. She is a former US Air Force officer, spent nearly 20 years in the California desert working at Lockheed Martin ADP, and now works as a computer programmer.

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