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Construct the Playfair matrix using the keyword SECRETKEY and then encrypt the message thisisourfirsttest. cl:fr:fr:mw:si:pb:es:cs:es cl:rf:rf:mw:si:pb:es:sc:es cl:fr:fr:mw:si:pb:es:sc:se O cl:fr:fr:mw:si:pb:es:sc:es

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Construct the Playfair matrix using the keyword SECRETKEY and then encrypt the message "thisisourfirsttest. cl:fr:fr:mw:si:pb:es:cs:es cl:rf:rf:mw:si:pb:es:sc:es cl:fr:fr:mw:si:pb:es:sc:se O cl:fr:fr:mw:si:pb:es:sc:es

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