The point is that it happened.

"One of the algorithms used in the 2019 test, SIKE, was broken in 2022, but
the non-PQ X25519 layer (already used widely in TLS) still protected the
data.[111] Apple's PQ3 and Signal's PQXDH are also hybrid.[101]"

thanks,
Rob

On Tue, May 26, 2026 at 2:59 PM Deirdre Connolly <[email protected]>
wrote:

> Does not say anything about 'very significantly harder to break' or
> similar.
>
> The point being that all hybrid constructions are argued to be secure as
> long as /one/ of the components is /still secure/, assuming that the hybrid
> constructor is itself secure.
>
> On Tue, May 26, 2026, 5:52 PM Rob Sayre <[email protected]> wrote:
>
>> On Tue, May 26, 2026 at 2:39 PM Deirdre Connolly <
>> [email protected]> wrote:
>>
>>> >  I have been led to understand that hybrid algorithms are very
>>> significantly harder to break than either conventional or PQ algorithms
>>>
>>> From where?
>>>
>>
>> This is a decent summary:
>> https://en.wikipedia.org/wiki/Post-quantum_cryptography#Hybrid_encryption
>>
>> thanks,
>> Rob
>>
>>
>
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