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Trail: Security Features in Java SE
Lesson: Generating and Verifying Signatures
Section: Generating a Digital Signature
Generating and Verifying Signatures
Generating a Digital Signature
Prepare Initial Program Structure
Generate Public and Private Keys
Sign the Data
Save the Signature and the Public Key in Files
Compile and Run the Program
Verifying a Digital Signature
Prepare Initial Program Structure
Input and Convert the Encoded Public Key Bytes
Input the Signature Bytes
Verify the Signature
Compile and Run the Program
Weaknesses and Alternatives
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Compile and Run the Program

> `Here` is the complete source code for the `GenSig.java` program, with some comments added. Compile and run it. Remember, you need to specify the name of a file to be signed, as in

> >     java GenSig data

> You can download and use this sample file named `data` or any other file you like. The file will not be modified. It will be read so that a signature can be generated for it.

> After executing the program, you should see the saved `suepk` (public key) and `sig` (signature) files.

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