(E.g., 72dd9b1cd9a06a16582936e1ffc2d047 doesn't seem to be in any md5 reverse lookups and a few forward tests of your string doesn't seem to work either. However, this doesn't seem to be the case. When I run the code its adding a space before it gives me the encrypted code for A. I was able to get the code to encrypt, but I am having issues with jumping the spaces in the output. Knowing the plaintext and ciphertext for a handful of values gives no information about the cipher used (other than the length of the ciphertext) or key, unless the underlying cipher is very flawed.Īlso, if you are mistaken, they may have used a 128-bit hash function instead of encryption e.g., md5. In my code, I had to take the plain text and encrypt it to print out in Ciphertext. Convert the letter into the number that matches its order in the alphabet starting from 0, and call this number Y. There's very little extra info to go from, without knowing the secret key but its likely a 128-bit cipher like AES-128.Ī secure cryptographic function should be indistinguishable to any attacker in polynomial time from a purely random function from the perspective of someone who does not have the key. For every letter in the cipher text C : 1. The second one base64-decodes to 16 bytes (128 bits): 72 dd 9b 1c d9 a0 6a 16 58 29 36 e1 ff c2 d0 47 I'm guessing the 62nd symbol (commonly a +) may have been converted to a %20. Possibly it is a URL-encoded space as %20 is a space. Answer (1 of 2): With a strong cipher, there’s no better way of finding the key given both the plaintext and the ciphertext than a brute-force search of the keyspace. Both appear to be 16 bytes (from the padding) but there seems to be a problem with the first one as it has a % character which is not commonly used in base64. The key is 7, which means the letter a becomes h. Decryption, the inverse of encryption, is the process of. Cipher text is also known as encrypted or encoded information because it contains a form of the original plain text that is unreadable by a human or computer without the proper cipher to decrypt it. Example: We will encrypt a sentence using Caesar Cipher. Correct option is B) To change the cipher text into plain text is known as decryption. Question: Enter the plain text: HELLOS Output: The changed plain text is HELXLOSX The cipher text is ECQZBXOV The decrypted text is HELXLOSX 3. The encoding of the ciphertext seems to be base64.īase64 encoding often ends with a double equal sign for padding and uses characters from as well as two extra character, typically + and /, though variants exist. The ciphertext can be reversed through the process of decryption, to produce the original plaintext.
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