Import 2022-12-01 19:15
1. Update etc config /etc/default/plexmediaserver # default script for Plex Media Server # the number of plugins that can run at the same time export PLEX_MEDIA_SERVER_MAX_PLUGIN_PROCS=6 # ulimit -s $PLEX_MEDIA_SERVER_MAX_STACK_SIZE export PLEX_MEDIA_SERVER_MAX_STACK_SIZE=3000 # where the
Unsorted
This web site has been down for more than a year and I have not been putting any time to maintain it and put it back online. These days I finally spent some time to make it happen. There is a new theme, new backbone using Ghost and I am
DevOps
1. Generate a set of SSH key pair in your server You would need a public and private of SSH key, theoretically it can be generated in any computer as you like. The following is a sample to generate the key. ssh-keygen -t rsa -b 4096 -C "nicholas@example.
Algorithm
Given a set of items, each with a weight and a value, determine the number of each item to include in a collection so that the total weight is less than or equal to a given limit and the total value is as large as possible. Drawing graph int[] plot(
Algorithm
1. Come up with a recursive function 2. Memorize the intermediate results 3. Make it bottom up
Algorithm
Definition of Palindrome left-to-right, and right-to-left, and it’s the same. For examples: Abba A man, a plan, a canal - Panama! Solution You need 2 pointers, one at the beginning, another one in the end. Move them one by one towards the center and check if it's
Network Security
A cipher suite specifies one algorithm for each of the following tasks: * Key exchange * Bulk encryption * Message authentication So you may see something like: PSK-AES-SHA256 Key exchange algorithms Key exchange algorithms protect information required to create shared keys. These algorithms are asymmetric (public key algorithms) and perform well for relatively
Network Security
SSL is the predecessor to TLS * SSL 1.0 was never released to public * SSLv2 in 1995, deprecated in 2011 (link) * SSL v3 in 1996, deprecated in 2015 (link) * TLS 1.1 in 1999 * TLS 1.2 in 2008 * TLS 1.3 currently in draft (link) References * https://www.globalsign.
Network Security
https://security.stackexchange.com/questions/9957/can-i-use-a-private-key-as-a-public-key-and-vice-versa
Network Security
What is certificate A electronic document with the following info 1. Who issued the certificate 2. Who the certificate is issued to 3. Valid to date (expiry date) 4. Public key 5. Digital signature Hash value of the certificate, used private key to sign the key -> digital signature
Network Security
The seven Open Systems Interconnection layers * Layer 7: The application layer * Layer 6: The presentation layer * Layer 5: The session layer * Layer 4: The transport layer * Layer 3: The network layer * Layer 2: The data-link layer * Layer 1: The physical layer References https://searchnetworking.techtarget.com/definition/OSI
Network Security
It happens in all HTTPS connections. Certificate phase, chose cipher suite 1. Client send hello, with supported cipher/version all other information 2. Server send hello, with certificate, and done hello 3. Premaster key done Symetric key exchange using asymetric public key in certificate 1. Computer installed many CA 2.