Security mechanisms to protect sms exchange in telecommunication networks

The device of the previous claim, wherein the modification of the subsequent transmission is a blocking of said transmission.

The device of one of the previous claim, wherein the first predefined criterion is matched for all communication parties.

The device of one of the previous claims, wherein the indication is comprised in a payload of the first short message, the finding of the indication in said payload being carried out only when the inspection of said payload is activated.

A method for filtering in a wireless communication network short messages sent by a communication party (510) to a mobile device (530), said method being carried out by a service node of said communication network and comprising the steps of:

• intercepting a first short message sent by the communication entity to the mobile equipment,
• finding, upon determining that the intercepted first short message is a data update short message comprising a data update for the mobile equipment, if the first short message comprises an indication that the communication party is requesting a proof of receipt message issued by said mobile equipment in reply to the reception of said first short message, in the same byte format as the first short message,
• provided the indication is found, modifying the subsequent transmission of the first short message to the mobile device when said communication party matches a first predefined criterion.

The method of the previous claim, wherein the step of modifying comprising a step of blocking the transmission of the intercepted first short message.