Collaborate Disseminate
In case multiple stream ciphers exist, Im refering to this specific instance in which you generate and key that is just as long as the msg, M, as a function of a nonce and a smaller key K.
My textbook classifies this as computational secu… Continue reading Why are stream ciphers computiationally secure? [migrated]
Using the cipher suite “TLS_AES_128_CCM_SHA256”
This example is referring to a self signed certificate
If a server uses TLS and uses the cipher suite above? How does the certificate get signed if there is not an asymmetric private key to s… Continue reading How does a Cipher Suite Work without an Asymmetric Algorithm?
An encrypted message in a series of letters and numbers of 98 characters long, the encryption key is 23 characters long of letters, numbers and symbol (.)
In case we want to decrypt the message but the encryption algorithm is unknown, can … Continue reading Can you tell encryption algorithm from key? [migrated]
I have a question about the Vigenere cipher and still do not know how to solve it.
A language has an alphabet of only 4 letters with frequencies as
follow: Pa=40%, Pb=20%, Pc=10% and Pd=30%. Create an encryption
function from this alphabe… Continue reading Create a vigenere cipher encryption
We are employing an AES-CCM 128-bit stream-cipher with 7-Byte Nonces and 12-Byte Authentication Tags in a communication protocol. Up until this point there was no need to use Additional Authenticated Data (AAD) in this protocol, as all tra… Continue reading Is it safe to use AES-CCM only for authentication – i.e. for sending AAD without encrypted data?
A new AES/CBC encryption is defined as:
C_0 = E_k(p_0) ⊕ IV
C_t = E_k(p_t) ⊕ C_t-1
Imagine that an attacker knows:
E_k is AES-128 and using the PKCS#7 padding
plaintext 1: such as "ABCDEFGHIJKL1234 EFGHIJKLABCD1234 EFGHABCDIJKL1234… Continue reading What is the vulnerability of this modified AES/CBC? [migrated]
What possible Ciphers could this ciphertext be from
LE-eheadty.AC2lta oiwyGC24
No key was given
I’ve seen similar questions to this with the answer being "it can literally be anything". While this is true, I believe this is from … Continue reading Cipher that includes dashes, periods, and is mixed-case [closed]
I’m a rookie in the cipher world, and I’m setting up squid as an TLS proxy. in an example it uses:
cipher=EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH+aRSA+RC4:EECDH:E… Continue reading Cipher, for a rookie, what’s safe and not safe 2021?
I recently was attacked by a ransomware that encrypted files in my computer and turning them into a .CRYSTAL file type. In the ransom note there is a “key id” which resembles a public key of sort, and a computer ID.
I paid – and got a “key… Continue reading How to tell what encryption a ransomware uses
I am testing my OpenVPN server (Debian 10, 1 CPU core, 2 GB RAM) I want to use stronger encryption.
But I feel network speed is slow with a stronger encryption cipher (SHA512, AES-256).
If I change the encryption cipher (SHA256, AES-128), … Continue reading Stronger OpenVPN encryption needs higher spec server? [migrated]