Some articles on kleptographic:

... A kleptographic attack is a forward-engineering attack that is built into a cryptosystem or cryptographic protocol ... Kleptographic attacks can be constructed as a cryptotrojan that infects a cryptosystem and opens a backdoor for the attacker, or can be implemented by the manufacturer of a cryptosystem ... Kleptographic attacks have been designed for RSA key generation, the Diffie-Hellman key exchange, the Digital Signature Algorithm, and other cryptographic algorithms and protocols ...