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Cryptography is the science of encrypting the information so that it isrendered unreadable for an intruder. Cryptographic techniques are of utmostimportance in today's world as the information to be sent might be ofinvaluable importance to both the sender and the receiver. Variouscryptographic techniques ensure that even if an intruder intercepts the sentinformation, he is not able to decipher it thus render ending it useless forthe intruder. Cryptography can be grouped into two types, that is Symmetric keycryptography and Asymmetric key cryptography. Symmetric key cryptography usesthe same key for encryption as well as decryption thus making it fastercompared to Asymmetric Key cryptography which uses different keys forencryption and decryption. Generation of dynamic keys for Symmetric keycryptography is an interesting field and in this we have tapped this field soas to generate dynamic keys for symmetric key cryptography. In this work, wehave devised an algorithm for generating dynamic keys for sending messages overa communication channel and also solving key refreshment problem.

Error Control Codes: A Novel Solution for Secret Key Generation and Key Refreshment Problem