How many parties define a digital signature?

Keep practicing — related questions

• who is the founder of facebook?
• What is the full form of COBOL?
• In Germany how many stores are available :
• The total number of possible boolean function involving 'n' boolean variable is?
• H&M has production office is India –
• H&M has designer collaboration with :
• In 2011 how many new stores are planned to be opened :
• H&M involves in business like