[sr-dev] topoh internals

Hi, I have a question about the topoh masking function: If we can control of 2 UAs A and B, when A invites B, A will know his plain Contact data, and B will see the masked one, and we will be able to collect almost arbitrary (data, encoded_data) couples. Kamailio's topoh module internals, if i've understood correctly, conceptually make use of such functions: * encode(contact_A, secret_key) -> result is contact_A_masked * decode(contact_A_masked, secret_key) -> result is contact_A What kind of method is used to do the encoding/decoding? Is it complex to compute the secret key, knowing both contact_A and contact_A_masked? Regards, -- Camille