Break It

Can you break the code?

This is a free room based on encoding and decoding challenges in different bases, ciphers and bit shifts!

Now, take a look at the rfc4648 memo to see the differences between the bases... It comes with examples too!

Task 1 - Bases

This challenge requires the basic knowledge of base decoding/encoding.

1) [Super easy]

MVQXG6K7MJQXGZJTGI======

We know this is a base, but does not look as a base64, way to many = signs at the end. The other base that has = signs at the end is base32. Looks like that is it!

2) [Easy]

TVJYWEtZVE1NVlBXRVlMVE1WWlE9PT09

Now, we know that all challenges in this first task have bases. This one doesn't really look like a one type of encoding so let's go with some base64.

The result ends with TMVZQ==== which looks familiar. Some base32 and we've solved the second challenge!

3) [Moderate]

GM4HOU3VHBAW6OKNJJFW6SS2IZ3VAMTYORFDMUC2G44EQULIJI3WIVRUMNCWI6KGK5XEKZDTN5YU2RT2MR3E45KKI5TXSOJTKZJTC4KRKFDWKZTZOF3TORJTGZTXGNKCOE======

To start with, let's start with base32 - this resolves into something starting with 38wSu8Ao9MJKoJZF, so not base64 nor base32 again. The different characters suggest this is base58. Now this looks like hex - now we got a string ending with 2lzX2hleA==. We know what that is, don't we?

4) [Hard]

HRBUGQDUHFWDIXKUIBWXIJTHIE3DCY3BIE2FKQSZHNDE6MRUIA2TWWDMHRBV2ZKCHQWFCTLPIE2EEJDBIBZCEW3OHUSTOLRCHNFGMVC6IFJXIQ2AHVMVONSBHVOVIM2MHVPV42J4HQVCQ4REIFHVIJ2WHFWDYQSUHROGILJCIFIU23CXHNCEIXK2HRDVSXKOHV2SQJLC

This one doesn't really look like anything to begin with, and knowing that it probably has a handful of different bases this makes it interesting...

At first, I started with base85 but after a couple of more bases the array gave me an error, so I moved to other most used bases. After finding the first, all the other encoding types play into the domino effect!

Using base32, the output from the encoding string is <CC@t9l4]T@mt&gA61caA4UBY;FO24@5;X. From here, base58 seem like a great idea with the characters in the output which does give us the clue that, in the end, the output and the next base is probably not something we expect it to be!

With the output ending with F2eWUyR1dQUlVjZ2pD. Here is where it becomes tricky. Before adding another base58, another base has to be added or we'll end up with the wrong output!

Let's repeat from the beginning: base32 -> base85 -> base64 -> base58.

Now, we end up with an output ending with /@RP$O=&s!1@Rj0L:fK,3.

What now? Well, what does it look like? Perhaps base85? The string now is somewhat recognizable, isn't it?

A couple of more bases (psstt... We've used it before and it's well known compared to the others) and we've got the right output!

5) [Insane]

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This one is definitely hard - insane is a good way to put it.

Looks like the author really likes base32, which helps identifying the next base based on the output starting with 2)6:/0JFV*1*AG1+>c&#1GU(, which now that we have some practice, is easily to identify as base85!

These next two are indeed bases, but are also known as decimal and hex, which corresponds to certainly "low" bases compared to the rest.

Here we have to stop. What is this?

MPpbz#c0#8}8:*6cJx_H|maIPV<=R[%Xio{<Kw*Xf#E6j+ap"wg/]5d1&P@4Mn4i3t20r#nT*Nb3ZkjSn)(II?3X:U<=iCjRkXc=BkE+B5iiSF*Yzoge.kSk05MKPm&e[z=,.?~d=4dUja0c?f@J>w<i!#,PzO4i~qf0x)%pSJRlPm=Trl{,%1&ev4]L.b`pXGTdA..e$Pk<Rl)fv!r.n/VTt&i<XOHZ#fef[*Xd%56@mNZX:O;F610S4%KU+Z1pd8M:{>+6n$0<mZ>TqX)=[[MCDMuHBkSiNg!3D3o0SJ^=?P8R>U@J/<~j"UB%KFhYla$Jk;@u]2LiramZ^7p;a`nTc

This looks like base91 as it includes all readable ASCII characters!

Once we are done with this with the help of dcode, let's get back to another round of bases

The first one appears to be base58 and the next base can be immediately recognized as base16 cough cough which, again gives us a recognizable output of base64. Now, just as we did before tackling the string with base91, run those two low bases!

Task 2 - Base and Cipher

How about mixing both base and cipher?

1) [Easy]

PJXHQ4S7GEZV6ZTDOZQQ====

This looks familiar enough, now the question is... what cipher is it?

If you want to know more about ciphers.

This one is a classic though! Give it in for ROT13!

2) [Moderate]

NjZMKVhATl1EcEI2Jio4Q0xuVy1EZSo5ZkFLV0M6QVUtPFpGQ0InIkReYg==

Again, let's start with a base - which one is identified with 2 = signs? base64 of course. Now, the output looks like base85, does it not?

B lhb jbgrtske podaee (key: tango)

What cipher needs a key to be set to decipher our decoded text?

Here

3) [Hard]

-!r/X,]n/Z-Zs\X,X$,rI<@]#-9Oh,-=A]R-p9\+

Huh... Okay, I'm saying it starts with base85. Now... what? This looks like... nothing? Let's try with a cipher... not 13, but 47. Okay, now this is starting to look slightly familiar.

T0ZaSEFZVFJPSlBXNFlMUkw1U1dFWlk9

Remember, just because base64 usually ends with those == it does not mean it always does! But after adding the base, once again that = gives away the next step to decipher the code and end with, again a nice 13 shift.

4) [Insane]

GZXSMPKXH4RGE4TKGQSVKYS3HJEUCXDMGJPDAXCSIE2SGQSIIFIWQRJZGBUUGKJJFU4T24DJIFISQSZSFY4VKMKUGZXSI2DLHRRTSXLKGQSVKYS3HUSG4LJQGFCW4OCOIE2SIZTAGQSSCJLFGBUUGKJJFU4T4J3NFNOUGM2BFY4VKMKUGZXSMPKXH4RGE4TKGQSVKYS3HNQVMXRMGEVFGL2NIE2SIIKMIFIWOQTRGBUUGKJJFU4T4J3NIMXWMSJGFY4VKMKUGZXSMPKXFURTKNJVGQSVKYS3HNQVMXRMGFQTIQKPIE2SGQSIIFIWQRJZGBUUGKJJFU4T24DJIFISQTRTFY4VKMKUGZXSMPKXFURTKNJVGQSVKYS3HNQVMXRMGFCW4OCOIE2SGLKDIFIWQY2FGBUUGKJJFU4T4XRKFNOUGKR6FY4VKMKUGRNCIX2SH4RGE4TKGQSVKYS3HUSG4LJQGBSDQJSMIE2SGQSIIFIWSQKRGBUUGKJJFU4T4URGFNOUGM2BFY4VKMKUGZXSI3CKIQXTU4JJGQSVKYS3IA3SURS6GFQTIQKPIE2SIZTAIFIWQRJZGBUUGKJJFU4T4XRKFNOUGM2BFY4VKMKUGRNCGNLGHRRTSXLKGQSVKYS3HUSG4LJQGFQTIQKPIE2SGLKDIFIWSU2ZGBUUGKJJFU4T24DJIFISQSZSFY4VKMKUHRES6NZNH4RGE4TKGQSVKYS3HUSG4LJQGFQTIQKPIE2SGLKDGRCWAZRHGBUUGKJJFU4T4J3NFNOUGKR6FY4VKMKUHRES2Y2OHRRTSXLKGQSVKYS3HJEUCXDMGJPDAXCSIE2SIIKMIFIWOQTRGBUUGKJJFU4T4J3NFNOUKXBSFY4VKMKUHRES2Y2OHRRTSXLKGQSVKYS3IA3SURS6GFCW4OCOIE2SIIKMIFIWQRJZGBUUGKJJFU4T24DJFNOUKXBSFY4VKMKUGZXSI2DLHRRTSXLKGQSVKYS3IFHUC2TCGFCW4OCOIE2SIIKMGRCWEUSYGBUUGKJJFU4T24DJIFISQTRTFY4VKMKUGRNCIX2SIBYW2X3SGQSVKYS3HUSG4LJQJA3E6ZKAIE2SIIKMGQSSCJLFGBUUGKJJFU4T4URGIMXWMSJGFY4VKMKUGRNCGNLGHRRTSXLKGQSVKYS3HJET6ORII5YDIXB7IE2SGQSIIFIWOQTRGBUUGKJJFU4T24DJFNOUGKR6FY4VKMKUHRES6NZNH4RGE4TKGQSVKYS3IA3SSMR2GITU6SSQIE2SIIKMIFIWSQKRGBUUGKJJFU4T24DJIFISQSZSFY4VKMKUGZXSMPKXGQUUQXKNGQSVKYS3HUSG4LJQGFCW4OCOIE2SIZTAIFIWQRJZGBUUGKJJFU4T4URGGZZFUKLIFY4VKMKUGRNCIX2SH4RGE4TKGQSVKYS3HJET6ORII5YDIXB7IE2SGQSIIFIWSQKRGBUUGKJJFU4T4XRKFNOUGLJ7FY4VKMKUGRNCIX2SIBYW2X3SGQSVKYS3HJET6ORII5YDIXB7IE2SIZTAIFIWSU2ZGBUUGKJJFU4T4XRKIFISQRKP 

I'm guessing here... 32? Then what?! Base85 simply looks wrong, those 4-to-something lines look so similar!

Ahhh...

It does look like base91, look at the small differences between those last lines... which brings us back to base10 and... base16 This last one is definitely base64 and once again the key is right there in the end!

GU4AmGDQNTu5ThnmDafNqiwt9yD7QB617C2uu (key: tangodown)

This ought to look slightly familiar by now.

Keep the key and let's continue with another base58! Now this roh gfh o nrtl purh qnnvkrx looks like the final step with Vigenere!

Task 3 - Base, Cipher, Bit Shift

1) [Moderate]

2D 37 2B 19 31 99 31 B3 B2 AB A5 18 32 37 20 B3 B2 AC 2D 1A 31 B4 A1 3A A4 A3 9C B4 AD 36 AC 9E

Okay, the first step is s left shift by 1 bit, which gives us ZnV2c2cgeWJ0dnAgeXZ4ciBuIG9iZmY=. This base64 string can then show the answer after the letters have been shifted 13 places.

2) [Hard]

19 1A 1C 99 1C 9C A8 38 27 B2 34 27 B9 27 26 28 3C 3B AA 28 A5 AA 2A 29 3C 29 B2 B2 21 B1 AC A6 1C AC 29 A8 38 99 2C

This one involves rotating the input to the left by 8 bits, resulting in:

248389QpNehNsNLPxvUPKUTRxReeBcYM8YRQp3X

From here, with a little bit of base58 and some common rotation, you are boss!

3) [Insane]

A9 A8 2B EE 2A AA C9 C8 C9 AA A8 0F 2A 8A AA EE A9 8A CA A8 A9 4F 6D 46 E9 A8 A8 0F A9 8A 6D 86 A9 AA A9 26 2A 8A 48 E8

This last one also involves the rotation of 8 bits to the left, but this time will be 3 consecutive times.

MEYwQUNFNUExQTUwMTVEMzk2OEExMTk4MUM1QTBG

Here, base64 will allow us to, again, shift left but this time as a block shift twice, resulting in <+9hi@WNZ(F`qh<.

This looks like base85 and... rot13!

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