1. Receive certficate from DBL
2. Extract certficate-data and message digest from certficate
3. Message digest for certficate-data.txt
4. Base64 decode digestsignature.b64 into digestsignature.bin
5. Extract message digest from digestsignature.bin into extracted_datadigest.txt
6. Compare datadigest.txt with extracted_datadigest.txt