Tag Info

New answers tagged

1

For example, let say that you have a message: "100 dollars should be moved." and you encrypt it with OTP. Then everybody can just take the first character "1" and change it to a 9 by XOR the 1 from the cipher-text and then XOR a "9" with the key you got. What you are describing is what happens if an attacker introduces changes in the ciphertext by a ...


0

Perfect secrecy is a security concept mathematically proved to be true for the one-time pad by Shannon in 1949. One-time pad is offering perfect secrecy if used with these three properties : The key space (number of possible keys) is greater than the number of possible plaintexts The key is truly random : each key of the key space has the same probability ...


1

Is CBC mode in OTP more secure? No. If your one time pad satisfies the required properties (it's truly random, the attacker has no information about it, and it's only used once), then OTP already has perfect secrecy; playing around with how it works can't make things better. If your one time pad doesn't satisfy the required properties, then all bets ...


0

Generating the IV for CBC mode by encrypting a counter is one of the IV generation methods recommended in NIST SP 800-38A, Appendix C: "There are two recommended methods for generating unpredictable IVs. The first method is to apply the forward cipher function, under the same key that is used for the encryption of the plaintext, to a nonce. The nonce ...



Top 50 recent answers are included