Based On The Android Platform Of Mobile Phone SMS Encryption Software Design And Implementation

At present our country as a result of continuous down-regulation of telecomtariff， which greatly increases the customer mobile phone， mobile phone hasbecome a fashionable topic， using mobile phone short message function also beganto gradually popular. The rapid growth of the number of users， mobile users infrequency of use， more conducive to the criminals steal for the message content，and mobile phone users by SMS fraud activities such as the content， the mobilephone users bring economic losses， even in the personal safety to get hurt， so tosay，with the development of multimedia mobile phone short message，also broughtsafety problems for mobile phone users.In order to solve the mobile phone user phrase message confidentiality issues，this paper designs an encryption software Android platform based on mobile phoneshort message. This software is analyzed through the message encapsulation protocolto tradition， then the structure of the traditional short message re combination andpackage. The software encryption method is based on block encryption， to separatethe content of the message， the head and SMIL message expression domain as ablock， and the attachment content remaining messages as another piece. Theadvantage of this method is mainly composed of the following：(1) Separate encryption method can separate PDU packet data; such illegalintruder is not easy to crack encryption;(2) The key content of the message uses two layers of encryption， theencryption， and then uses the AES encryption， to further increase the difficulty ofdeciphering; (3) To change the message package existing protocols， key encryption lengthinformation to come in，so that it is convenient in decryption when the use of lengthwill be the amount of contents of each part and then merged together.In addition tothe study of short message encryption algorithm， this paper also considers themessage encryption module needs to have other functions. For example： filtering，SMS message content of the real-time monitoring. These functions and messageencryption algorithm are combined together to achieve the protection of multimediamessages.Some of the main functions of the end of the encrypted message encryptionsoftware was tested， through testing can verify each function realization in theencryption software is correct and effective， tests prove that the encryption softwarecan realize the message of the PDU implementation effectively encrypted message，can guarantee the security of data transmission and confidentiality however， thismethod is also flawed， is the need of management requires the use of the key， howto manage in this paper does not discuss.