2013년 12월 3일 화요일

freq - lastlog analyzer

freq is a Perl script used to analyze the last log. It works on Linux systems, but may also work on other UNIX-based systems that have the same format for their lastlog. I have added some preliminary support for SunOS and IRIX, though this has not been tested to the point where I would know if it is completely working or not.

It can spit out information regarding how many times a user has logged in as well as what days, terminals, hours, and months are most popular for logins. In addition, it can sort this information alphabetically or ascending or descending by number of logins. It can even generate simple graphs.

http://www.bangmoney.org/projects/freq/

Reentrancy Attack: 블록체인 스마트 컨트랙트의 치명적인 취약점

블록체인 기술이 전 세계적으로 주목받으면서 스마트 컨트랙트(Smart Contract)의 사용이 급격히 증가하고 있습니다. 하지만 그만큼 보안 취약점도 함께 늘어나고 있는데, 그 중에서도 Reentrancy Attack(재진입 공격)은 매우 치명적이고...