Symmetric Cipher: Substitution | S7 | KTU | CSE | Cryptography and Network Security 

My fifteenth short lecture video in Malayalam on Symmetric Cipher: Substitution from CS409 Cryptography and Network Security (CNS) of S7 B.Tech CSE of APJ Abdul Kalam Technological University aka KTU. This is the first video of Module 1.
NOTE: A is 0 and Z is 25... Sorry for the mistake!
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