Let's say I've retrieved an encrypted secret key from the server. I decrypt it to get the actual secret key, assign the decrypted key to a variable in my app. Something along this:
const encryptedKey = fetchKeyFromServer(); const secretKey = decrypt(encryptedKey); //Now, the variable secretKey has the actual secret key in memory
Now, is this a vulnerable thing to do in terms of security? Since I've stored the decrypted key in the memory, is there a chance that somebody might be able to reveal the secret key by reading off from the app's memory?
However, if I don't assign the decrypted key to a variable, how should I use the key? I've thought of assigning the encrypted key to the variable and decrypt it every time I need to use it. But I'm still not sure if this is the best way to do things.