name: ROC
full_form: Roll-Over-Counter
context: SSRCs, and hence the SSRC shall be randomly generated. Care should be taken to avoid SSRC repetition when a user uses the SRTP Master Key for more than one session. In particular, SSRCs shall not be generated in a way which could cause collisions (e.g. from the same seed). The SRTP authentication tag may be appended to every 'rth' packet as defined in IETF RFC 4771 [24] to provide the SRTP ROC counter to MC UEs performing a late-entry to the communication. A 'mode 3' integrity transform (RCCm3) shall be supported for transmitting the ROC within a 4 octet SRTP authentication tag. NOTE: The ROC and MKI fields of the SRTP packet are not authenticated as part of the AEAD_AES_128_GCM algorithm. However, modification of these fields would cause a failure to validate the AEAD authentication tag which would cause the packet to be correctly rejected by the receiver. If an unauthenticated SRTP encryption mode be used, there will be a security impact of a malicious modification of the ROC or MKI
description: The Roll-Over-Counter (ROC) is a parameter in Secure Real-time Transport Protocol (SRTP) that helps prevent packet replay attacks and ensures the integrity of encrypted communications. It is used to keep track of the number of packets sent or received, and its value is included in the SRTP authentication tag.
explanation: The context explicitly mentions ROC as a counter used within SRTP to provide security features such as preventing collisions and ensuring packet authenticity. This indicates that ROC serves as a critical network attribute for secure communication operations, fitting the definition of a Parameter.
section_title: 7.5.1	General
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