encryption/decryption method of application data

The present invention provides a secure communication (secure communication) to In, randomly generated initial vector relates to the encryption and decryption method of the application data using the (Initial Vector), to encrypt and decrypt the application data transmitting side and the receiving side which can solve the soluble degradation and stability degradation due to network taps due by using a random initial vector value, data is lost application data that is newly created in the encryption key value (K) with the initial vector value (IV) to share the present invention relates to encryption and decryption methods. Symmetric-key encryption, a block cipher, CBC mode, the initial vector (IV), the encryption key