DES (Data Encryption Standard Algorithm)

XOR cipher https://youtu.be/1ReFV0tU9yA Permutation Box https://youtu.be/7XXEnGzGdNw S Box https://youtu.be/NCJndnty0Gg Symmetric key cryptography https://youtu.be/f-fjkHwx1Io cryptography and it's components https://youtu.be/O0yqDfFMyRY