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Punjabi University, Patiala

(Established under Punjab Act No. 35 of 1961)

ਪੰਜਾਬੀ ਯੂਨੀਵਰਸਿਟੀ, ਪਟਿਆਲਾ

Fairplay 24 120

The Playfair cipher was the first useful digraph substitution cipher. –