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For this reason it may be interesting to use an unrelated cipher on the inner encryption. …

An option that was not previously mentioned is symmetric searchable encryption. These schemes are also not perfect but likely better than hashed trigrams. …

Although that's not really a fault of end-to-end encryption exactly. It can however be a circumvention of end-to-end encryption. … These APIs generally have no mechanism to export the key material that they hold and instead only allow encryption/decryption/sign/verify operations by the App against the key without ever exposing it. …

There is nothing materially wrong with this idea, I guess the term for it would be sign-then-encrypt. A mitigation should be included for replay attacks. Just because someone signed a message at one …

Bluetooth MAY be encrypted. There are unencrypted modes of both classic bluetooth and BLE which would expose one's audio streams. Let us also not forget that custom BLE profiles may be used however …

And even worse, the quality of encryption is maybe impossible short of a degree in the subject. … But determining if there is some encryption may be as easy as pressing the same key over and over and see if the message sent is random or predictable. How can I find out the Bluetooth version? …

In asymmetric cryptography there is a notion of a root of trust. In OpenPGP for instance it's not terribly uncommon to exchange keys face to face. And then trust all online communication because it c …

Key rotation (of encryption/decryption key if it is ever exposed) would require every user to log in and update their encrypted store of the key. …

Properly implemented AES-256 encryption is, at this time, unbreakable. File password protection seems to be built on this and should be fine. … If one is unsure of the security of encryption features in a program, putting a file in an encrypted zip is always an option. …

Another answer has the rule so how about some intuition: ChaCha permutes a block of data into an unpredictable block of data and XORs it with your plaintext. Because XOR is reversible, the same unpre …

Would salsa20 + umac be a good choice for encryption/authentication? This question dates itself and in 6 years my specific recommendations will date themselves. … Chacha-Poly is the authenticated encryption recommended pair from that family at the time of this writing. …

One such mechanism would be to encrypt the key locally and send it to be stored on the server. For example: Use PBKDF2 with a user chosen recovery password to generate a key. Use the key that pops ou …

It could increase security posture if there was an attacker that had access to the running RDS but not the ability to read/use the service where the key is stored (KMS, HSM, etc). This would depend h …

Two issues: Encryption must be reversible While erasing random bits is obfuscating, it is not encryption. Think of a magazine page where someone cut a few letters out of it. … Second, output of encryption should be statistically random. …

Each message should have a distinct IV and start from zero in the encryption process, no matter the mode. ECB's issue arises from a lack of IV, not the lack of chaining. …