Questions tagged [aes-gcm]

Deprecated tag, see tag info. Advanced Encryption Standard Galois/Counter Mode, better known as AES-GCM is a mode of operation for symmetric key cryptographic block ciphers that has been widely adopted because of its efficiency and performance. GCM supports authenticated encryption, meaning that the mode not only offers privacy, but also integrity.

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Real time video stream AES encryption with authentication

I am now studying AES encryption for real-time video streaming. It seems that Netflix uses the AES-GCM (or CBC + MAC) mode for real-time video encryption and authentication. With MAC authentication, ...
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1answer
330 views

how does BearSSL's GCM modular reduction work?

BearSSL (in src/hash/ghash_ctmul.c) seems to be doing a modular reduction that I don't completely understand. Here's the code: ...
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Patent Status & Usability of AE Modes [closed]

Post Structure: Sources Cited Question & Details Before You Answer Useful Info From Comments Sources Cited: https://blog.cryptographyengineering.com/2012/05/19/how-to-choose-authenticated-...
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662 views

How is NIST's Key Wrap (using AES GCM) different than normal AES GCM Authenticated encryption?

From what I could gather, it seems like that NIST's key wrap (publication) provides similar security like AES-GCM Authenticated encryption. If this is true, why did we need a separate specification ...
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0answers
468 views

WebCrypto AES-GCM vs AES-KW for key wrapping

The Web Crypto API available in most browsers supports both AES-GCM and AES-KW for key wrapping. There are examples for AES-KW and AES-GCM performing key wrapping, and a popular live table indicates ...
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641 views

Is it safe to use a counter as IV for AES256-GCM

What if I will use 96-bit integer counter starting from 0 as IV for AES256-GCM cipher. Is it safe? Is there any other ways to ensure uniqueness of IV for GCM cipher?
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AES-GCM for Securing Bluetooth Low Energy Application

I have a task at hand on designing security on Bluetooth Low Energy application layer. The system is created so that only smartphones with symmetric key (long term) could communicate and control my ...
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1answer
613 views

Key generation for AES-GCM-256 file encryption

I am currently working on a file encryption software that works via AES-GCM-256 and I am looking for feedback on the encryption key generation process I intend to implement. So far, I have come up ...
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1answer
182 views

What does GHASH really do?

I try to understand the GCM-MODE used in TLS. The problem I have had is described below. 1:textbook describes how GHASH works: 2: I get some debuginfo from openssl code that contain enc_key(32 bytes)...
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828 views

Which is slower, AES or GCM hash (GHASH), if CPU has no special instructions?

In an answer to this question: Security of GCM if Implemented with Stream Cipher instead of Block Cipher ...it was stated that: The GHASH part of GCM is usually the problematic one when it comes to ...
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What Are the Risks of AES-GCM [Key, Nonce, Message] where Nonce = Message

A group of bankers will store sensitive financial information on a server owned by a third party. I represent the 3rd party server. The financial information will be stored as plain text on the ...