.......Security experts say that even though the value in transactions through basic mobiles is not high there will be volume-based vulnerability. The caution comes at a time when the government is planning to extend banking service on basic telephones using the *99# command or USSD (Unstructured Supplementary Service Data)a communication protocol for GSM providers. “When compared to SMS, USSD is considered to be relatively more secure because no copies of messages are stored on customers' phones or at the SMSC. The big risk lies on the fact that data carried within the communication channel (between handset and USSD gateway) is not encrypted,“ .....
Read - TOI
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