Postgres Sign Row

rsa openssl

https://www.enterprisedb.com/postgres-tutorials/how-properly-sign-rows-provide-integrity-postgresql

pgp

https://medium.com/@jianshi_94445/encrypt-decrypt-your-data-using-native-postgres-functions-with-sequelize-js-c04948d96833

Hash

https://stackoverflow.com/questions/13683533/hash-a-column-in-postgres-using-sha-256

Plpythonu

https://stackoverflow.com/questions/44418256/is-there-a-way-to-verify-a-signed-digest-within-postgres