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Using multiple asymmetric keys as backups for one another

I’ve been thinking about ways to take advantage of multiple asymmetric encryption schemes so that each key could be a backup to the others in case of cryptanalysis of one given scheme.
Those public key schemes could each secure one share of a symmetric key splitting scheme (as answered in Is there a multiple asymmetric encryption algorithm, which requires all private keys to reveal the secret?).

Something similar could also apply to digital signatures (just requiring all signatures to be valid) or key sharing schemes (just inputting multiple shared secrets into one KDF).

Is there precedent for that?

How to store sensitive session data in chrome web extension?

I am working on crypto-wallet and ran into a data storage security issue. Such data as passphrase, password etc are storing in encrypted form using chrome.storage But I need a password every time when I want to access my app and to resolve this i want to store some session object. Chrome team will migrate::Listen

I am working on crypto-wallet and ran into a data storage security issue. Such data as passphrase, password etc are storing in encrypted form using chrome.storage
But I need a password every time when I want to access my app and to resolve this i want to store some session object.

Chrome team will migrate to manifest v3 soon without v2 support thats why i cant using persistent background script and store data in it. Maintaining a persistent service worker session is also not a good idea.

I found some info about chrome.storage.session that allows to store some data without persisting to the disk.

The main concern is whether someone can access this storage and get data from there or change them? is it safe?

I will be glad to any suggestions and ideas

Using multiple asymmetric keys as backups for one another

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