1. Chaum D. The dining cryptographers problem: Unconditional sender and recipient untraceability. Available from the author. Chaum D. The dining cryptographers problem: Unconditional sender and recipient untraceability. Available from the author.
2. Chaum D. Privacy protected payments: Unconditional payer and/or payee untraceability. Available from the author. Chaum D. Privacy protected payments: Unconditional payer and/or payee untraceability. Available from the author.
3. Chaum D. Showing credentials without identification: Transferring signatures between unconditionally unlinkable pseudonyms. Available from the author. Chaum D. Showing credentials without identification: Transferring signatures between unconditionally unlinkable pseudonyms. Available from the author.
4. New directions in cryptography