Ring signatures and stealth addresses

Signing for a group without saying who, spending only once, and paying a fresh key every time.

Ring signatures: leaking a secret for a group (2001)

Ring signatures: leaking a secret for a group (2001)

Linkable ring signatures and key images (2004)

Linkable ring signatures and key images (2004)

CryptoNote stealth addresses: a fresh key for every payment (2013)

CryptoNote stealth addresses: a fresh key for every payment (2013)