PacketMania

RSA is a public-key cryptosystem built on top of an asymmetric encryption algorithm, which was jointly invented by three cryptographers and computer scientists at the Massachusetts Institute of Technology in 1977. The RSA public-key encryption algorithm and cryptosystem provide data confidentiality and signature verification functions widely used on the Internet. Since its birth, RSA has become a major research object of modern cryptography. Many cryptanalysts and information security experts have been studying its possible theoretical flaws and technical loopholes to ensure security and reliability in practical applications.

uClibc is a small and exquisite C standard library for embedded Linux systems. It is widely used in the development of low-end embedded systems and Internet of Things devices. Here are some recent experiences to provide convenience for engineers who need to solve similar problems or meet corresponding requirements.

Recently, at a WPA3 technology introduction meeting within the R&D team, the speaker mentioned that the OWE technology for encrypted wireless open networks is based on Diffie-Hellman key exchange, and casually said that Diffie-Hellman key exchange is using technology similar to RSA. This statement is wrong!

In March 2021, the Internet Engineering Task Force (IETF) released RFC 8996, classified as a current best practice, officially announcing the deprecation of the TLS 1.0 and TLS 1.1 protocols. If your applications and web services are still using these protocols, please stop immediately and update to TLS 1.2 or TLS 1.3 protocol versions as soon as possible to eliminate any possible security risks.

By chance, I came across a picoCTF RSA challenge called Sum-O-Primes. This problem is not difficult, you can do it by knowing the basics of the RSA algorithm. In addition, if you are familiar with the history of the evolution of the RSA algorithm, you can find a second ingenious fast solution.

Memory access errors are the most common software errors that often cause program crashes. The AddressSanitizer tool, developed by Google engineers in 2012, has become the first choice of C/C++ programmers for its wide coverage, high efficiency, and low overhead. Here is a brief introduction to its principle and usage.

IPv6 supports multiple addresses, making address assignments more flexible and convenient. Unlike IPv4, which relied solely on the DHCP protocol for address assignment, IPv6 incorporates a native Stateless Address AutoConfiguration SLAAC) protocol. SLAAC can either work alone to provide IPv6 addresses to hosts, or it can work with DHCPv6 to generate new assignment schemes. Here is a comprehensive analysis of the dynamic address allocation mechanism for IPv6.