Abstract: Biswas crypto-intensive techniques in combination of Encryption algorithm, Signature generation algorithm, Signature verification algorithm and Decription algorithm.Michael O. Rabin Signature scheme uses random padding to validate signature.Analogously the proposed techniques uses same padding system including additional quotient and residuum.The only difference is that Rabin signature is pair or triple in some special cases but proposed model uses forefold signature system.Michael O. Rabin Cryptosystem can generate same ciphertext form different plaintext as well as multiple plaintext from single cyphertext.To solve those issues, i designed a new cryptosystem "A mathematical model for ascertaining same ciphertext generated from distinct plaintext in Michael O. Rabin Cryptosystem".But it did not have authentication system to verify sender and valid message because there was no signature generation facility.In this article, i have designed a new signature algorithm in combination with previous techniques and Michael O. Rabin public key Signature scheme.Receiver can decipher secret message from sender's signature.The proposed crypto intensive technique uses two times security key by slightly altering Diffie-Hellman key exchange protocol.The advantage of proposed crypto intensive technique is that the sender generate signature using encrypted text and intended receiver can retrieve plaintext from signature through signature verification system.The proposed crypto teachniques secure against man-inthe-middle attack.It is unforgeable while Rabin's signature is forgeable in forgery attack.