A method of ensuring that an executable program has come from a valid software publisher and has not been altered by anyone in between.

What is meant by code signing?

Code signing is a method of putting a digital signature on a program, file, software update or executable, so that its authenticity and integrity can be verified upon installation and execution. Like a wax seal, it guarantees to the recipient who the author is, and that it hasn't been opened and tampered with.

What is code signing used for?

Code signing is a digital signature added to software and applications that verifies that the included code has not been tampered with after it was signed.