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  • How do I decrypt cipher text to plaintext - Stack Overflow
    Try modifying your program to produce the ciphertext output with hexadecimal encoding, and accept the ciphertext input with hexadecimal encoding That way, you can print the ciphertext as regular text instead of a byte array, and the user can enter the ciphertext as a regular string (instead of a byte array) using the keyboard
  • How does the receiver of a cipher text know the IV used for encryption . . .
    IVs don't make breaking a ciphertext harder IVs are ususlly just prepended to the ciphertext and hence known to a potential attacker The main reason to use IVs is to randomize the ciphertext If you encrypt the same plaintext twice with the same key, but different IVs then the ciphertext should be different
  • Determine Encryption Algorithm from Keys, Seed, Plaintext, and Ciphertext
    The keys and ciphertext always start with "AQAj777K", even after the password keys are updated The documentation from the software manufacturer states the following: The software complies with PCI security standards that require cardholder information be encrypted using standard algorithms and encryption key lengths
  • Caesar Cipher Function in Python - Stack Overflow
    Placing cipherText before the start of the for loop will solve your problem Additionally, there is an
  • Encrypt and decrypt using PyCrypto AES-256 - Stack Overflow
    ciphertext = aes encrypt(plaintext) return (iv, ciphertext) # Takes as input a 32-byte key, a 16-byte IV, and a ciphertext, and outputs the # corresponding plaintext def decrypt(key, iv, ciphertext): assert len(key) == key_bytes # Initialize counter for decryption iv should be the same as the output of # encrypt()
  • How do I fix garbage at the head of my AES decrypted ciphertext?
    The IV needs to be identical for encryption and decryption This is often accomplished by prefixing the randomly generated (and unencrypted) IV to the ciphertext For CBC the IV is always the same size as the block size - always 16 bytes - to decrypt first retrieve the IV from the first 16 bytes and then decrypt the rest
  • Get IV from Encrypted text to use in decrypt method
    Seems you are not sending IV along your ciphertext (it is not done itself) Common practice is prepending the IV to the the ciphertext So as Robert commented, you can write IVto the memory stream directly prior encryption when decrypting, you can read the IV (first bytes of your data, but decrypt only the rest (sub-array 16 length )
  • Can a cipher be shorter than the original text? - Stack Overflow
    This means that any message of the same size should return ciphertext that is indistinguishable If you have a specific set of messages that increases the ciphertext then obviously they are distinguishable from the other messages And because of the pigeon hole principle, it is of course impossible to have smaller ciphertext for all possible
  • java - Sending IV with cipher text - Stack Overflow
    So the idea of the IV is that it generates a different ciphertext and in most cases that is beneficial rather than a problem If it is a problem depends on your protocol Note that the ciphertext length may still show information about the plaintext (i e "Affirmative, Sergeant" will of course be different than the encryption of "No")





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