Port scrambling for computer networks

A method comprising:

• receiving, in a computerized apparatus, an incoming communication via a port, wherein the incoming communication is received from an external device via a computer network;
• computing an unscrambled port based on the port, wherein said computing is performed using an inverse function of a transformation function and is based on a list of authorized programs;
• redirecting the incoming communication to be received in the unscrambled port.

A non-transitory computer readable medium retaining program instructions, which program instructions when read by a processor of a computerized apparatus, cause the processor to perform:

• in response to receiving a request of a program to transmit an outgoing communication designated to be received at a destination via a port and determining whether the program is listed in a list of authorized programs;
• in response to a determination that the program is listed in the list of authorized programs, modifying the outgoing communication to be designated to be received at the destination via a scrambled port, wherein the scrambled port is computed based on the port and using a transformation function;
• wherein the transformation function depends on the list of authorized programs.

A non-transitory computer program readable medium retaining program instructions, which program instructions when read by a processor, cause the processor to perform a method comprising:

• in response to receiving an incoming communication via a port, computing an unscrambled port based on the port, wherein said computing is performed using an inverse function of a transformation function and is based on a list of authorized programs, wherein the incoming communication is received from an external device via a computer network;
• redirecting the incoming communication to be received in the unscrambled port.