Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Protection at a particular protocol layer
Reexamination Certificate
2005-04-05
2005-04-05
Smithers, Matthew (Department: 2137)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Protection at a particular protocol layer
C380S286000
Reexamination Certificate
active
06877092
ABSTRACT:
An apparatus, method, and computer program product for achieving interoperability between cryptographic key recovery enabled and unaware systems. The method includes the steps of encrypting data using a cryptography key to generate ciphertext; generating a key recovery block containing key recovery information for the ciphertext; determining whether a receiver for the ciphertext is key recovery unaware; and sending the key recovery block to a key recovery client when it is determined that the receiver is key recovery unaware. In a preferred embodiment, the ciphertext is sent to the receiver only after receiving confirmation from the key recovery client of the receipt of the key recovery block. Also in a preferred embodiment, the key recovery block is sent as part of an Internet Message Control Protocol (ICMP) message.
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patent: 6061454 (2000-05-01), Malik et al.
Al-Salqan,“Cryptographic Key Recovery”, 1997, IEEE, pp. 34-37.*
Lee et al,“On the Key Recovery of the Key Escrow System”, 1997 IEEE, pp216-220.
Chandersekaran Sekar
Malik Sohail
Muresan Michael
Vasudevan Narayanan
International Business Machines - Corporation
Otterstedt Paul J.
Smithers Matthew
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