Code Download and Firewall for Embedded Secure Application

A CMOS device being fabricated using standard CMOS processes without on-chip EEPROM and/or Flash memory units, the CMOS device comprising:

• an interface module for fetching secure data from a memory that is external to the CMOS device;
• a random access memory unit being integrated on the CMOS device and configured to store the fetched secure data;
• and
• a read-only-memory unit having a boot code that is configured to cause the CMOS device to authenticate the stored secure data based on a series of validations.

A method for authenticating data from an external memory that is to be stored into a device having random access memory unit and a read only memory unit, wherein the read only memory unit includes a boot code that causes the device to fetch the data from the external memory, the method comprising:

• fetching data from the external memory;
• storing the fetched data in the random access memory unit;
• and
• authenticating the fetched data based on a series of validation;
• wherein the fetched data comprises one or more executable applications and a certificate including at least a root public key.