Format preserving encryption of object code

A method performed by a system comprising a hardware processor, comprising:

• receiving object code to be secured;
• parsing the object code to identify a list of instructions, each instruction comprising an opcode and zero or more parameters;
• identifying an instruction format for the list of instructions, wherein the instruction format is one of an R-type, an I-type, and a J-type instruction;
• applying a format preserving encryption (FPE) to the received object code, wherein the FPE is applied separately to a sub-plurality of instructions in the list of instructions, to generate an encrypted object code comprising a sub-plurality of encrypted instructions;
• and
• providing the encrypted object code to a service provider, wherein the encrypted object code comprises the sub-plurality of encrypted instructions, and any unencrypted portions of the object code.

A non-transitory computer readable medium comprising executable instructions to:

• identify a list of instructions in an object code to be secured, each instruction in the list of instructions comprising an opcode and zero or more parameters;
• apply a format preserving encryption (FPE) to the object code, wherein the FPE is applied separately to each instruction in the list of instructions, to generate an encrypted object code comprising a list of encrypted instructions;
• provide the encrypted object code to a service provider;
• and enable execution of the object code based on a valid decryption key to be applied to the encrypted object code.

A non-transitory computer readable medium comprising executable instructions to:

• identify a list of instructions in an object code to be secured, each instruction in the list of instructions comprising an opcode and zero or more parameters, wherein the object code is a smart contract in a blockchain;
• apply a format preserving encryption (FPE) to the object code, wherein the FPE is applied separately to each instruction in the list of instructions, to generate an encrypted smart contract comprising a list of encrypted instructions;
• provide the encrypted smart contract to a service provider;
• and
• store the encrypted smart contract in the blockchain.