Strong authentication using dynamic hashing and steganography Now a day’s online services became part of our life which performs communication digitally. This digital communication needs confidentiality and data integrity to protect from unauthorized use. Security can be provided by using two popular methods cryptography and steganography. Cryptography scrambles the message so that it cannot be understood, where as the steganography hides the message in another medium which cannot be detected by normal human eye. This paper introduces a technique which provides high security to the digital communication by using dynamic hashing for integrity and also embedding the data in image file using steganography to misguide attacker. There by providing high security for the communication between two parties.