diff --git a/无进位乘法和GHASH.md b/无进位乘法和GHASH.md
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 # 参考
-* [Cryptographic Hardware and Software and useful architectures](1)
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+* [Cryptographic Hardware and Software and useful architectures](https://www.esat.kuleuven.be/cosic/events/ecrypt-net-school-2018/wp-content/uploads/sites/23/2018/10/kos-school-gueron-2.pdf)
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