android - Save RSA PublicKey / PrivateKey safely -

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i create , use rsa public/private key encrypt/decrypt message.i store them sharedpreferences string , when need them create string. works perfectly, secure store private key in sharedpreferences string. question :

sharedpreferences mode_private security

i learned that, can reach sharedpreferences , can generate private key string. can make private key secure while save on phone?

it depends on the level of sensitivity of private/public key pair. think, storing them in sharedpreferences not bad idea. key pair stored relative app directory , has system protection external access. but, word "shared"preferences implied, key pair shared among app components. so, if need better protection, consider storing key pair in keystore class instead . of now, best solution key pair protection. provides password based key protection.

update: there great article on android keystore , keychain usage here.


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