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Questions tagged [aead]

Authenticated Encryption with Associated Data

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4 votes
1 answer
594 views

Should one really disable AEAD for recent GnuPG created PGP keys?

Apparently, there are some problems with the new defaults that are set when one creates a PGP key using a recent version of GnuPG (2.4). I ran into this after generating a new ECC/ED25519 key to ...
Tobias Leupold's user avatar
1 vote
1 answer
93 views

Replay of previously used cipher, IV and authentication tag in authenticated encryption

It is known that an authenticated encryption scheme is better than just encryption because, in the latter, an attacker can alter the ciphertext, which cannot be verified. In the former, altering the ...
Mohit Kumar Jangid's user avatar
3 votes
1 answer
280 views

How to form the IV and Additional Data for TLS when encrypting the plaintext

When using AES GCM for encryption within TLS and referring to the below diagram: Is iv[0:3] the fixed IV established from the handshake and iv[4:11] are the current (write) sequence number + 1? For ...
rare77's user avatar
  • 145
1 vote
1 answer
137 views

AEAD: Authenticating a digest of my data instead the data itself

Relevant question for Python: Stack Exchange: https://stackoverflow.com/questions/75739308/aead-authentication-with-huge-input-that-doesnt-fit-into-ram Top Answers: https://topanswers.xyz/python?q=...
user2373145's user avatar
1 vote
0 answers
171 views

Where is the 8 byte explicit nonce for decrypting AES GCM within TLS?

I'm confused how to retrieve the remaining 8 bytes of the nonce (to combine with the 4 bytes established during the handshake) to generate the 12 byte IV to decrypt AES 128 GCM. RFC 5288 "AES ...
user997112's user avatar
2 votes
2 answers
19k views

Generate AES-256-GCM key

I'm using aes-256-gcm encryption. I used a sample key provided in the docs and it works fine. I also tried a key generated from here and it works fine. There's no option to specify gcm here yet the ...
Wilfred Almeida's user avatar
3 votes
2 answers
432 views

Does any real world protocol makes use of the associated data in AEAD?

I'm trying to find evidence of use of the associated data (authenticated cleartext associated with the encrypted and authenticated data) feature offered by AEAD (Authenticated Encryption with ...
Bruno Rohée's user avatar
  • 5,507