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zh3r0 2020 Crypto - Uncipher Me

Uncipher Me Description Challenge Files ct.txt key.txt key_2.txt key_3.txt Lets begin with the keys. cat key.txt TjogR0kzRE9OWldHUVpER01SVkdFWURLT0JWSEUyRE1NSllHNFpEQU5CVEdBNFRJTUJSR0VZVEdNQlpHTTRUU01CWUdJMlRNTUJRR1U0RElOSlhHUTJUS05CUUdBM1RLTlpTRzQzRE1PQlRIRTJESU9KWUc0M0RRTVpXSEU0VE1NWlpHUVlUU01CVEhFWkRBTkpYSEU0RE1NSldHTVlURU5KU0c0N...

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zh3r0 2020 Crypto - RSA warmup

RSA-Warmup Description RSA is one of the first public-key cryptosystems and is widely used for secure data transmission. In such a cryptosystem, the encryption key is public and distinct from the decryption key which is kept secret. You all know this :p here is a warmup question. nc crypto.zh3r0.ml 8451 Author : Finch Lets quickly net cat n...

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zh3r0 2020 Crypto - Mix

Mix Description At the BASEment no. 65536, A man is irritated with SHIFT key in his KEYBOARD as it's a sticky key, A kid is having chocolate icecream with a SPOON. Author : Whit3_D3vi1 Challenge Files Mix.zip Mix/chall_encrypted.txt Mix/flag.txt flag.txt reads If you opened this then you are a n00b HAHA VERY FU...

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zh3r0 2020 Crypto - Hastads Message

Hastad’s message Description My friend Hastad send me a message but I am not able to read it. Only thing I know is its different each time. nc crypto.zh3r0.ml 7419 Author : Finch Lets see what happens on netcatting the server nc crypto.zh3r0.ml 7419 N: 239609496311365490105807093714474593207717229906416564692897157101422954951249486211586878...

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zh3r0 2020 Crypto - Double Fish

Double Fish Description There two fishes in the Xander's Operative Register A flag is waiting for you when you catch both. _0m\K2!2%\ggrdups\vd~gq Author : Finch Challenge Files chall.txt cat chall.txt xxkxxxxkxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxcddddddddddddddddddddddddddddddddddddddddddcxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx...

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Nahamcon 2020 Crypto - elsa4

Elsa4 Apparently, its an instance of LC4 cipher. We are provided with a subtle hint Frozen in time which could mean random is seeded with the present time, confirmed by the fact that time is provided at the start of the challenge. Now, all we need to figure out is the length of nonce, however it is implemented. I also wrote encrypt, decrypt...

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Nahamcon 2020 Crypto - Unvreakable Vase

Unvreakable Vase We are provided with prompt.txt, which reads zmxhz3tkb2vzx3roaxnfzxzlbl9jb3vudf9hc19jcnlwdg9vb30= This seems to be base64 encoded but I think all the letters are converted to lowercase as hinted by squished and flat import base64 data = 'zmxhz3tkb2vzx3roaxnfzxzlbl9jb3vudf9hc19jcnlwdg9vb30=' m1 = base64.b64decode(data) print...

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