Block Ciphers – IT Exams

Analyzing the TLS record, Exams of IT, IT Certification, Plaintext integrity, Security of generic composition

GCM performance 2 – The Galois Counter Mode

11/30/202108/31/2024

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

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

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

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,

Limits on key usage – TLS Record Protocol Revisited

05/19/202108/31/2024

Posted by Whitney Koehler

17.6 Limits on key usage TLS 1.3 specification defines cryptographic limits for the total amount of plaintext that can be securely encrypted using a given set of keys. Assuming that the underlying

Analyzing the TLS record – TLS Record Protocol Revisited

03/31/202108/31/2024

Posted by Whitney Koehler

17.7.3 Analyzing the TLS record What about the 32 payload bytes in the preceding TLS record? How are these bytes computed and where is our original plaintext GET / HTTP/1.1? We can explore these

Symmetric cipher suites in TLS 1.3 – TLS Cipher Suites

02/22/202108/31/2024

Posted by Whitney Koehler

18.1 Symmetric cipher suites in TLS 1.3 TLS 1.3 specifies a set of so-called symmetric cipher suites that Alice and Bob can use to protect the data transmitted via the TLS Record protocol. Each