TLS Record protocol – 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

Indistinguishability under a chosen-ciphertext attack 2 – Authenticated Encryption

01/19/202408/31/2024

Posted by Whitney Koehler

To get an intuitive understanding of why the above definition is useful for cryptographic purposes, let’s look at a simple example taken from . Assume that Alice, Bob, and a trusted third party

MAC-then-encrypt – generic composition – Authenticated Encryption

07/11/202308/31/2024

Posted by Whitney Koehler

15.2.2 MAC-then-encrypt The MAC-then-encrypt composition computes the MAC of the plaintext m, appends the MAC to the plaintext, and encrypts the resulting value: The MAC-then-encrypt composition is

Authenticated encryption with CCM – Authenticated Encryption

12/15/202208/31/2024

Posted by Whitney Koehler

15.5.1 Authenticated encryption with CCM To apply CCM, sender Alice must provide the following four inputs: How to perform authenticated encryption with CCM based on these four inputs is illustrated

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 2 – The Galois Counter Mode

06/07/202208/31/2024

Posted by Whitney Koehler

The primary purpose of the initialization vector IV is to act as a nonce. As a result, it must be distinct for every authenticated encryption operation under the same key. As long as distinctiveness

GCM performance – The Galois Counter Mode

01/20/202208/31/2024

Posted by Whitney Koehler

16.3 GCM performance There is an old saying among cryptographers that the real challenge is not to design a secure algorithm, but one that is secure and fast. While this is typically said somewhat

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

TLS record payload protection – TLS Record Protocol Revisited

08/15/202108/31/2024

Posted by Whitney Koehler

17.3 TLS record payload protection As illustrated in Figure 17.1, before data is transmitted over the wire, the TLS record protection functions – denoted by E in Figure 17.1 – encrypt

Limits on key usage 2 – TLS Record Protocol Revisited

05/20/202108/31/2024

Posted by Whitney Koehler

So, we start by calling the s˙client tool with the -crlf option to deal with carriage return, and -msg and -debug to see detailed information on TLS messages and print the debugging information,