Linked Questions
13 questions linked to/from Possible ways to crack simple hand ciphers?
2
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plaintext and its encrypted version known [duplicate]
I have a (long) text in two versions, encrypted and plaintext. I think it was encrypted using a substitution cipher method (I'm pretty sure, indeed).
I'm not good in this matter, I know little about ...
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1
answer
683
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Decide strategy to decrypt cipher [duplicate]
TL;DR:
If you have to decrypt a cipher for example, and you don't know which encryption method(s) have been used.... Where do you start? Or "do you just start"? Or are there certain questions you have ...
3
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2
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How to determine the shift key to decrypt a ciphertext which was encrypted using Caesar cipher?
So I found this question in a model paper,
Break ciphertext ”BJJY GPXF DI TJPM ZSYH” which is encrypted by a
Caesar Cipher.
This gives a meaningful plaintext if we use 21 as the shift key. So ...
2
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2
answers
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How to decode a (Vigenère?) substitution cipher? [closed]
I am trying to decode a message that I suspect has been encrypted with a Vigenère cipher:
Utl zluuocp zsc rvzu hbcp ztvibfz vrabzz utl ilry. Utlal flal cb fbaiz, qszu zbsciz. Utvu cllihl vhzb dvil ...
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3
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1
answer
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Cryptanalysis of XOR cipher with repeated key phrase
My assignment is to cryptanalyze cipher text that we know was encrypted with a stream cipher (bitwise XOR of plain text and key stream), and decrypt to plain text. We know the key stream is a repeated ...
- 31
1
vote
1
answer
11k
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How to solve encryption with ASCII output
There are lots of text files which have unknown data packets with ASCII output (no available plaintext exists with regard to any ciphertext, I have only encrypted outputs). The input data is known to ...
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1
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1
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2k
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How to do a frequency analysis?
I don't quite get frequency analysis..
I see percentages and else, when I tried to do a frequency analysis on a pictogram cipher, the only letter I was able to analyze was the letter A.
Any step-by-...
- 63
4
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1
answer
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Deciphering “easy” ciphers without hints
I've been keen on IT Security for a long time now and I've learned a lot about networking & security. However trying a "decryption challenge" I'm lacking what I think is basic encryption/...
- 93
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1
answer
3k
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How to decrypt a string given as part of a game/prank? [closed]
I have been given an obviously encoded string, that looks similar to this:
...
- 117
1
vote
1
answer
2k
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Ciphers based on Keywords
I am looking for different ciphers that use a key word (like "hello" or "awesome") to encrypt a given text. I know about the Keyword Cipher already; I'm looking for others.
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0
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1
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How to start a classical cryptanalysis on a Substitution + Shift cipher? [closed]
i was thinked about problem of Cyrpto.
At first glance, it looks like a simple classic password problem, but there are a lot of difficulties to think about the way the two encryption schemes are ...
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1
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1
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What is the procedure to proceed towards breaking a cipher text when the process of encryption is not known?
I mean , if one is provided with a cipher text and the process of encryption through which text has has been encrypted has not been provided , then how is the cipher text broken ? Is frequency ...
1
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0
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How do you go about breaking a Quagmire III Cipher? [duplicate]
For example, take K1, from the Kryptos sculpture, which has been long solved. It's text is as follows:
EMUFPHZLRFAXYUSDJKZLDKRNSHGNFIVJ
YQTQUXQBQVYUVLLTREVJYQTMKYRDMFD
Now, I already know they ...