The code of the CTF study

This year, the domestic various CTF competitions are overwhelmed, the first time to participate in CTF because Baidu held the BCTF. At that time with a few friends to participate in, the process is quite interesting, so embarked on this road of no return.

CTF really is a very test of brain power of a thing, the scope of the topic is quite wide, every time to participate in the CTF I have a very strong feeling: knowledge is not enough, or turn off the browser roll back to learn!

Today, is SCTF, the list of various great gods I can only worship, determined to study hard, the system of learning, today start with code.

I think it is more common in the CTF to belong to Morse code. is a special string of symbols made up of dots and dashes. Such as:

The figure has been given very clearly, the comparison with the solution can be.

Ranked second in the Base64, the number of occurrences seems to be more than the above: no matter.

What is the most striking feature of Base64? Smart you must know, that is: if there is a string after the = or two = = then it is certainly base64 this goods.

However, attention does not mean that the two are not Base64, to be careful analysis. Base64 Another major feature is that the number of strings must be a multiple of 4, then

Here's the question: what if it's not enough? Haha, the previous said = number will come in handy, when the number of less than 4 multiples of the use of the = number to fill.

General solution Base64 can use Python or use the hackbar extension of Firefox directly or you can use this link to decode.

In fact, this site provides a number of encoding decoding method, you can collect:)

There is also a use of less code, called Braille.

There is a certain direction, very good to remember.

There is another, very simple, is the phone keypad, give you a bunch of numbers, on the phone to knock out.

There is this one, rarely used, but it is better to understand. Semaphore, according to the different positions of the flag to determine which letter.

The last one: Bacon cipher

Well, it's almost like this, it's just the basics, and the senior stick can be ignored!

The code of the CTF study