Collaborate Disseminate
I was reading a book called Serious Cryptography. There is a page saying that block size must be large enough to prevent codebook attacks:
When 16-bit blocks are used, the lookup table needs only 2^16 × 16 = 2^20 bits
of memory, or 128 ki… Continue reading How to calculate size of a codebook lookup table to break block cipher? [migrated]
Which ciphers to be used currently, and which protocols to be used in opportunistic TLS for postfix SMTP
Continue reading Which ciphers to be used currently, in opportunistic TLS for postfix SMTP [closed]
I would like to know if there is a way to identify the algorith used to cipher a something
Let’s say I have this ciphered text VEVTVCBDSElQRVI= and I want to identify the algorithm used (base64 in this example).
Thank you
I would like to know if there is any way to recover the plain-text of a message that’s been encrypted with 55 rounds of the Caesar cipher, with a different (independently chosen) key for each round; I must use a brute-force attack, and do … Continue reading how do i find the number of possible keys / password to decrypt a plain text
When using OpenSSH server (sshd) we specify allowed ciphers, host key algorithms and MACs. Some of those ciphers have an email address appended, for example aes256-gcm@openssh.com as opposed to aes256-ctr. What is the meaning of that? I ch… Continue reading OpenSSH: Meaning of cipher with email address @openssh.com
Users have negotiated a secret key.
Then they connect to the server and generate the hash of their key using JavaScript on the client side.
They all connect to the server sending their initialization vector (IV), but the server stores only… Continue reading CBC-MAC for end-to-end multi-user encryption
Apart form the following, are there any other standard properties that a cryptographic Substitution box or the S-Box should have:
Changing one input bit should change about half of the output bits.
Each output bit should depend on every … Continue reading What are the standard properties of an S-Box [migrated]
My friend gave me a file with encoded data, I got a hint that it is either a single phone number, or, a list of phone numbers [phone number is of 10 digits]. I tried a lot of ciphers and encodings, but of no help. Any solution or suggestio… Continue reading Unable to decode phone number from a file [closed]
I have previously removed less secure ciphers from WHM (Web Host Manager) however it has been a while and I want to learn how to fish, not be handed a fish.
The trouble seems to stem from the fact that there is little-to-no consistency in… Continue reading Remove less secure ciphers from WHM by decrpyting different convoluted references to the same ciphers
I am using Naviserver’s nsssl module and it expects the list of TLS ciphers to be in OpenSSL’s “CIPHER LIST FORMAT” e.g.
ns_param ciphers “ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM… Continue reading Converting a list of ciphers to OpenSSL’s "CIPHER LIST FORMAT" [migrated]