Private Key cryptography is a cryptographic system that uses the same secret key to encrypt and decrypt messages.The problem with this method is transmitting the secret private key to the person that needs it without it being intercepted. So, we have focused on the secret procedure to retrieve secret value from the private key rather than securing the actual private key value.Encryption is done in bit level and simple XOR operation is used block wise in several level for encryption.Multiple operators and Nth even or odd term from ASCII representation based scheme increases the security as operators combination and ASCII representation are different in respect of the user choice and the plaintext respectively.A new idea is Implemented where the Nth even or odd term are being calculated from the even and odd bit position of the plaintext. Armstrong or Perfect number with base value scheme with ordering sequence provide a great security as the infinitive numbers of Armstrong or Perfect numbers are in the world.Lastly, multiple operators and number of 0s and 1s present in the plaintext based scheme increase security.A new technique called bit-sieve is proposed for encryption in futur