Plaintext integrity – Block Ciphers

Analyzing the TLS record, Exams of IT, GHASH function, IT Certification, Plaintext integrity, Security of generic composition, TLS Record protocol

CTR mode – Block Ciphers and Their Modes of Operation

08/31/202408/31/2024

Posted by Whitney Koehler

14.4.5 CTR mode The Counter (CTR) mode, illustrated in Figure 14.12, is a mode of operation that applies the underlying block cipher f to generate a key stream that is subsequently used for

Preliminaries – Authenticated Encryption

03/20/202408/31/2024

Posted by Whitney Koehler

15.1 Preliminaries Before diving into the details of authenticated encryption, we must first introduce some security concepts that we will need later on for an in-depth understanding and comparison

Plaintext integrity – Authenticated Encryption

11/11/202308/31/2024

Posted by Whitney Koehler

15.1.4 Plaintext integrity In terms of the integrity of symmetric encryption schemes, the notion of plaintext integrity requires an encryption scheme to be designed in such a way that no algorithm

Authenticated encryption with associated data – Authenticated Encryption

03/20/202308/31/2024

Posted by Whitney Koehler

15.4.1 Authenticated encryption with associated data In this section, by associated data we mean any data that should be authenticated but not encrypted. There are some scenarios where it is useful

Authenticated decryption with CCM – Authenticated Encryption

10/20/202208/31/2024

Posted by Whitney Koehler

15.5.2 Authenticated decryption with CCM To decrypt and authenticate Alice’s message using CCM, Bob must provide the following four inputs: In the first step, Bob computes the key stream Si =

Preliminaries – The Galois Counter Mode

08/31/202208/31/2024

Posted by Whitney Koehler

16.1 Preliminaries According to the American security researchers David McGrew and John Viega, ”the Galois/Counter Mode is a block cipher mode of operation that uses universal hashing over a binary

GHASH function – The Galois Counter Mode

06/05/202208/31/2024

Posted by Whitney Koehler

16.1.2 GHASH function GCM’s authentication mechanism is based on a hash function called GHASH. The function contains a multiplication by a fixed parameter H within GCM’s 𝔽2128 field.

GCM performance 2 – The Galois Counter Mode

11/30/202108/31/2024

Posted by Whitney Koehler

To make it simple for you to reproduce the results we’re about to show, we will again use the OpenSSL Docker image. It goes without saying that if you want to obtain performance results for a

TLS Record protocol – TLS Record Protocol Revisited

10/20/202108/31/2024

Posted by Whitney Koehler

17.1 TLS Record protocol The purpose of the TLS Record protocol is to cryptographically protect data in transit using the shared secret keys that Alice and Bob established using the TLS Handshake

Per-record nonce – TLS Record Protocol Revisited

07/20/202108/31/2024

Posted by Whitney Koehler

17.4 Per-record nonce Alice and Bob keep a 64-bit sequence number for reading and writing TLS records. They increment this number every time they read or write a TLS record. At the start of a TLS