Metactf 2021 - Crypto

CTF Name : MetaCTF 2021 (Dec 5)

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Category : Cryptography #5


This Writeup involves Easy level challenges (Beginner Friendly) Pure Beginner Friendly Challenges

1. Size Matters

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 Ciphertext: 0x2526512a4abf23fca755defc497b9ab
e: 257
n: 0x592f144c0aeac50bdf57cf6a6a6e135
  • RSA Decoder in dcode.fr
  • image

    Flag : MetaCTF{you_broke_rsa!}


2. A to Z

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  • Just an Alphabetical substitution image

    Flag : bashful_is_my_fav_dwarf


3. Wrong Way on a One Way Street

image cb78e77e659c1648416cf5ac43fca4b65eeaefe1

  • crackstation.net image

    Flag : babyloka13


    4. Unbreable Encryption

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 Ciphertext ( c1): 4fd098298db95b7f1bc205b0a6d8ac15f1f821d72fbfa979d1c2148a24feaafdee8d3108e8ce29c3ce1291

Plaintext (p1): hey let's rob the bank at midnight tonight!

Ciphertext (c2) : 41d9806ec1b55c78258703be87ac9e06edb7369133b1d67ac0960d8632cfb7f2e7974e0ff3c536c1871b
key = 
so 
key = c1 xor p
p2 = c2 xor key
p2=MetaCTF{you're_better_than_steve!}

Thats all image


5. Tq For The pwd

image Just a Base64

echo TWV0YUNURntlbmNvZGluZ19pc19OMFRfdGhlX3NhbWVfYXNfZW5jcnlwdGlvbiEhfQ==|base64 -d

Flag : MetaCTF{encoding_is_N0T_the_same_as_encryption!!}


Thanks For reading - Team TamilCTF