1. Caesar cipher is substitution technique cipher
  2. In Caesar cipher we replace each alphabet with the alphabet that is actually 3 alphabet down the order. So, each A will replace with D, B will replace with E, C will replace with F and so on.
  3. Thus using Caesar cipher MY BSC IT will replace with PB EVF LW.
  4. Clearly we can see that Caesar cipher is weak cipher for hiding plain-text messages. All that required to break this cipher is to do reverse the Caesar cipher that is replacing each alphabet with 3 places up in the line.
  5. Process mention above will reveal original text so one can easily figure out PB EVF LW is actually MY BSC IT.

Caesar Cipher

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