Context? Limitations? Number of secret holders? Are both parties verifiable (ie. can you exchange some information beforehand to verify identify?) Is data reten

Context? Limitations? Number of secret holders? Are both parties verifiable (ie. can you exchange some information beforehand to verify identify?) Is data retention a concern? Email signed by PGP or a one-time pad. Can the person be trusted with a thumb drive (and to not lose it or have it stolen)? There's a number of ways with various security levels and I'd say most are "secure enough". For example, I'd trust my friend with a thumb drive that had an encrypted archive on it with a shared passphrase if the archive contained semi-sensitive information. Why? I doubt anyone who finds the lost thumb drive would have the technical knowledge to break into an encrypted archive and a lengthy passphrase would make bruteforce attacks take years on the off-chance they know how and would even try.