Solve problems, post new ciphers in thread, etc
Today’s Crypto University Challenges are:
G1 Undergrad at CU
Just something hopefully easy to get started. Crack the cipher. (Note: the spaces are just grouping, the underscores are the real spaces.)
WOTHL EMOEU LE__B C_TC!
G2 Master's Program
To get a Master's Degree or Ph.D at CU you must analyze this encryption program I just made.
The python code can be found here:
Let me explain how the encryption program works.
You choose a key, which can be any number really. The ith letter is encrypted like this:
[eqn]cipher_i = [ message_i + (key*(i+1)\mod 95 ) ] \mod 95 [/eqn]
Which produces a random (based on the key) value between 0 and 94, add 32 to get an ASCII character.
You can use the program by typing these commands:
encrypt(42046,"I'm pregnant")
Output: "8WBkFqL,W={
G2: Tell me which values would not be effective as keys.
G3 PhD Program
(I do not know the answers to these questions, nobody does, that is why it is PhD level )
Either find a way to crack this cipher
80pnt{n?AZY?ygA*fb0}mG&hK@y[Y
OR you can also find some kind of attack or vulnerability with the system. Let me know if chosen plaintext or any other information can help you crack the cipher.
Sincerely yours,
1-}Z?{
