Re: [quicwg/base-drafts] Expand AEAD limits to consider multi-user security. (#3789)

[Jana Iyengar <[e-mail]>]

@janaiyengar commented on this pull request.



> +
+~~~
+(q + v) <= 2^28
+~~~
+
+Assuming `v = q`, endpoints cannot protect more than 2^27 packets in a single
+connection without causing an attacker to gain an larger advantage than the
+target of 2^-60.
+
+### Integrity Limit
+
+For integrity, Theorem (4.3) in {{?GCM-MU}} establishes that an attacker gains
+an advantage in successfully forging a packet of no more than:
+
+~~~
+(1 / 2^(8 * n)) + ((2 * v) / 2^2*n) + ((2 * o * v) / 2^(k + n))

```
this:~ jiyengar$ echo "(1 / 2^(8 * n)) + ((2 * v) / 2^(2 * n)) + ((2 * o * v) / 2^(k + n))" | wc -c
      68
```

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