Post Office Protocol

Summary

In computing, the Post Office Protocol (POP) is an application-layer Internet standard protocol used by e-mail clients to retrieve e-mail from a mail server. Today, POP version 3 (POP3) is the most commonly used version. Together with IMAP, it is one of the most common protocols for email retrieval. Purpose The Post Office Protocol provides access via an Internet Protocol (IP) network for a user client application to a mailbox (maildrop) maintained on a mail server. The protocol supports list, retrieve and delete operations for messages. POP3 clients connect, retrieve all messages, store them on the client computer, and finally delete them from the server. This design of POP and its procedures was driven by the need of users having only temporary Internet connections, such as dial-up access, allowing these users to retrieve e-mail when connected, and subsequently to view and manipulate the retrieved messages when offline. POP3 clients also have an option to leave mail on t

Official source

https://en.wikipedia.org/wiki/Post_Office_Protocol

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Collective Remote Attestation (CRA) is a well-established approach where a single Verifier attests the integrity of multiple devices in a single execution of the challenge-response protocol. Current CRA solutions are well-suited for Internet of Things (IoT) networks, where the devices are distributed in a mesh topology and communicate only with their physical neighbours. Recent advancements on low-energy protocols, though, enabled the IoT devices to connected to the Internet, thus disrupting the concept of physical neighbour. In this paper, we propose HolA (Holistic and Autonomous Attestation), the first CRA scheme designed for Internet-like IoT networks. HolA provides defence against attacks targeting both the nodes and the network infrastructure. We deployed HolA on both a network of real devices (i.e., 5 Raspberry Pis) and a simulated environment (i.e., 1M devices in an Omnet++ network). Our results demonstrate that HolA can resist against a disruptive attacker that compromises up to half of the network devices and that tampers with network traffic. HolA can verify the integrity of 1M devices in around 12 s while the state-of-the-art requires 71 s. Finally, HolA requires 7 times less memory per device compared with the state-of-the-art.

SPRINGER INTERNATIONAL PUBLISHING AG2022

Cryptanalysis of e-mail protocols providing perfect forward secrecy

Recently, two e-mail protocols were proposed claiming to provide perfect secrecy. These protocols use authentication and (Diffie-Hellman) key-exchange techniques, and as such, other standard security criteria besides perfect forward secrecy include key-replay resilience, known-key security, key freshness and unknown key-share resilience are expected too. In this paper, we show that the two protocols cannot resist replay attacks, and further that the first falls to unknown key-share attacks while the second fails to provide perfect forward secrecy, contrary to the designers' claims. Although the two protocols were intended by the designers to be more secure variants compared to the common e-mail protocol, our results show that being newer does not necessarily mean being more secure. (C) 2007 Elsevier B.V. All rights reserved.

2008

What future for the Post Office Network

Matthias Finger

2017