# Cybersecurity Guide


  • HASH
  • [CRC-32] [MD5] [SHA-1] [SHA-256] [SHA-512]
  • ENCODING / DECODING
  • [Base16(enc)] [Base16(dec)] [Base64(enc)] [Base64(dec)] [URL(enc)] [URL(enc)(+ASCII)] [URL(dec)] [HTML_entity(enc)] [HTML_entity(dec)]
  • CONVERSION
  • [Hex] [Dec] [Oct] [Bin]

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  • ๐Ÿ”จ ONLINE TOOL
  • ๐Ÿšฉ WRITE-UP
  • ๐Ÿฐ CODE
  • ๐Ÿ“ฆ OTHER
    •  ๐Ÿน Tool
    •  ๐Ÿงช Simulation
    •  ๐Ÿ“„ Reference
    •  ๐Ÿ’พ Misc
  • How to enable root account in Ubuntu
    How to enable root account in Ubuntu
    The first time you install Ubuntu, you can not use the root account. Here we discuss how to activate it. ์ตœ์ดˆ Ubuntu๋ฅผ ์„ค์น˜ํ•˜๋ฉด root ๊ณ„์ •์„ ์‚ฌ์šฉํ•  ์ˆ˜ ์—†๋‹ค...
  • How to call solidity functions with Web3, metamask library
    Public view/pure functions can be simply called. However, in other cases, you need to log in because of gas fee. It can be done with metamas...
  • Root me write-up : Logs analysis - web attack
    Root me write-up : Logs analysis - web attack
    This is a quiz to find flags in web server logs. The web server log contains the base64 encoding value in the order variable, and...
  • How to initialize Web3 library in Javascript
    To use Web3, there are two ways to enter an RPC address or use a metamask. Web3๋ฅผ ์‚ฌ์šฉํ•˜๋ ค๋ฉด RPC ์ฃผ์†Œ๋ฅผ ์ž…๋ ฅํ•˜๊ฑฐ๋‚˜ ๋ฉ”ํƒ€๋งˆ์Šคํฌ๋ฅผ ์ด์šฉํ•˜๋Š” ๋ฐฉ๋ฒ•์ด ์žˆ๋‹ค.   1. Using RPC Addr...
  • Square CTF postfuscator write up
      < getFlag #4, Own this NFT! ( Link ) > ▶ How to play Download the provided file( Link ). ์ œ๊ณต๋˜๋Š” ํŒŒ์ผ ๋‹ค์šด๋กœ๋“œ. The humans who designe...
  • pwnable.kr ascii_easy write-up
    pwnable.kr ascii_easy write-up
    To comply with the rule 3, I masked some things that is needed to solve this challenge. I thought that I may needs ROP, not RTL. ...
  • OverTheWire Bandit write-up(Level 29 → Level 30)
    The current write-up that you are viewing is an ordinary write-up. ํ˜„์žฌ ๋ณด๊ณ ๊ณ„์‹  write-up์€ ์ผ๋ฐ˜ write-up ์ž…๋‹ˆ๋‹ค. To comply with the rule, in this wr...
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