All in one big bag. For fun, profits, or CTFs.

grep word f1
 
sort | uniq -c
 
diff f1 f2
 
find -size f1

zcat f1 > f2
 
gzip -d file
 
bzip2 -d f1
 
tar -xvf file

echo 4wcYUJFw0k0XLShlDzztnTBHiqxU3b3e | nc localhost 30000
 
openssl s_client -connect localhost:30001 -quiet
 
nmap -p 31000-32000 localhost
 
telnet localhost 3000

Base64

ASCII Conversion Table

Convert All

• In Python:

• Decimal to binary

>>> bin(124234)
'0b11110010101001010'

• Decimal to hex:

>>> s =hex(secret)

• Hexadecimal to binary:

SECRET.decode('hex')
'==QcCtmMml1ViV3b'

$ python -c 'print "2f722f6e6574736563".decode("hex")'

• Hex to ascii:

$ xxd -r -p <<< 2f722f6e6574736563

• Base64 decode:

>>> SECRET.decode('base64')
'oubWYf2kBq'

• md5 hashes http:https://hash-killer.com/ http:https://www.md5this.com/

The recon problems usually give you someone/something's name and a task or a hint to find some specific information about it. So the first thing is of course google it.

Google anything using keywords such as filetype:cgi inurl:cgi-bin

• Facebook, Twitter, Linkedin, Google+, reddit, /r/netsec.
• IRC: with **/whois **.
• namechk
• Github: check in the commit history.

• karmadecay
• tineye
• images.google.com