Offload-friendly network encryption in the kernel
The PSP security protocol enhances encryption efficiency by offloading tasks to NICs, supporting AES encryption. Despite benefits, concerns about unidirectional connections and standardization persist, prompting discussions on integration challenges.
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The PSP security protocol aims to efficiently encrypt packets by offloading encryption and decryption to network interface cards (NICs, used by Google in data centers). PSP, encapsulated in UDP, reduces NIC state tracking for more connections. PSP requires NICs to generate keys, enhancing security. PSP uses AES-128-GCM or AES-256-GCM for encryption, supporting efficient hardware implementation. Despite benefits like reduced memory usage and scalability, concerns arise about PSP's unidirectional connections and lack of standardization. Kernel developers question adding PSP alongside existing protocols like IPsec and TLS. Technical challenges include retransmissions and key rekeying. While PSP offers advantages, its proprietary nature and implementation complexities raise doubts about standardization and widespread adoption. Discussions highlight the need for standard protocols and interoperability, emphasizing the importance of addressing technical concerns before integrating PSP into the Linux kernel.
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