Symmetric Key Cryptography: The Caesar Cipher

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This is the first in a series about cryptography; an extremely important aspect of computer science and cyber security. It introduces symmetric key cryptography with a well known substitution cipher, namely the Caesar Cipher. It includes a few examples you can try for yourself using different encryption keys.
  1. Computer Science Lessons
  2. Cryptography
  3. Plain text
  4. Cipher text
  5. Encryption
  6. Decryption
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Комментарии
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It is the best course about cryption on Youtube. Thank you, awesome teacher.

billchen
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Thanks for the great video! You explain really well.
At 5:32 - the answer to the first exercise seems to have one incorrect letter. "MOVE TO HIGH GROUND". Should the first and last letters of HIGH be the same in ciphertext also?

meeras
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Me after decrypting the first secret message: 😳

laceycodetime
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Nice videos, I've watched a couple.


It would be nice if you put the strings (sample input) in the description for people coding along here.

johnsahhar
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What is the name of the teacher of this course? Has he got any course in MOOC? Can I be certified from the official courses of this teacher?

rezatayfe
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Could you please do it where there are one set numbers on the inner section as part of a cipher wheel, encrypting and deciphering numerical cipher text?

- I’ve been quite fascinated by it since seeing it in the Enola Holmes film.. I want to figure out some of the codes myself. 🕷:’)

kydune
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I'm watching this so I can figure out some of the messages in my gravity falls journal

zoesmith