I am reading an article about group signatures - a concept in application cryptography. There are 3 operators I'm not very clear on what they mean. Please explain to me or where can I search?
I'm reading the article A Practical and Provably Secure Coalition-Resistant Group Signature Scheme by Giuseppe Ateniese, Jan Camenisch.. My question is related to the Setup protocol section 4.1 'The Group Signature Scheme'. Thank you for your help