Karl Norrman

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This document defines an integrity transform for Secure Real-time Transport Protocol (SRTP; see RFC 3711), which allows the roll-over counter (ROC) to be transmitted in SRTP packets as part of the authentication tag. The need for sending the ROC in SRTP packets arises in situations where the receiver joins an ongoing SRTP session and needs to quickly and(More)
Privacy is a main concern for mobile network users, and there are many proposed enhancements for the protection of the long-term subscription identifier. Some enhancements require asymmetric key operations, which increase both processing requirements and protocol message sizes. To the best of our knowledge, there has been no practical implementation(More)
In this paper, we present constructions for 3GPP Authentication and Key Agreement (AKA) that provides Perfect Forward Secrecy for the session key. Further, the constructs prevents an attacker, with access to the long-term pre-shared key, from simply eavesdropping the challenge RAND in the AKA run, and use the RAND and long-term pre-shared key to derive the(More)
Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.(More)