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convert the Tux to PPM with Gimp # Then take the header apart head -n 4 Tux.ppm > header.txt tail -n +5 Tux.ppm > body.bin # Then encrypt with ECB (experiment with some different keys) openssl enc -aes …

But, of course, this table would be ${HUGE}$ (e.g.: for the AES: $2^{128} \times 128$ bits, I don't even know how to write this quantity, but could be approximated by $2^{92}$ Terabytes). … Resume of white-box applied in AES algorithm (slides 18 - 24). …

They use a different way, the encrypt the filename with AES-EME. EME (ECB-Mix-ECB) is a wide-block encryption mode developed by Halevi and Rogaway in 2003 [eme]. … EME-32 is a concrete implementation of EME with a fixed length of 32 AES blocks. …

The reason we add salts to the key derivation process it to make the key hash image unique for a given password. Actually a salt is added to remove weakness when an attacker has a list of "most common …

obfuscation aims to hide the logic of the obfuscated algorithm, and usually, this is not the same security target of such situation you described, code obfuscation aims to hide that the obfuscated code is an AES … obfuscation in this context is used to hide how it is computed and in particular when/where the key is loaded in memory, data obfuscation is used to hide the link between some loaded data and the plain AES …

Given a AES round, all the operation between the two AddRoundKey (at the beginning and the ond of the round) are invertible. …

There is book Algebraic Aspects of the Advanced Encryption Standard thats gives a good algebraic description of the AES algorithm. …

Yes, the principle to use a common password and a unique salt per file with a key derivation function is a good and acceptable practice, as you generate the salt randomly and with the right size. The …

One needs to have a key with the proper length to use the AES encryption algorithm. … Therefore an AES-256 with a 56-bit effective key length should not be considered as secure. …

In cryptography an Initialisation Vector or IV is an input of fixed size required to randomize the output of a cryptographic primitive. It is not meant to be secret, so there is not problem in make it …

No, you can't. A symmetric encryption scheme without a random IV is not sure at all. The scheme is deterministic. from wikipedia: In cryptography, an initialization vector (IV) or starting variable ( …

Yes, you can encrypt multiple plaintexts with the same key, as you couple AES with a cipher-block mode that allows that. ECB does not allow that. … But using AES-CTR or AES-CBC with a counter or an IV randomly generated allows you to encrypt a lot of data under the same key. …

The inverse in AES is defined over a particular field. All the operation are done in this field. The Rijndael finite field is defined as follow: $GF(2^8) = GF(2)[x]/(x^8 + x^4 + x^3 + x + 1)$. … There are several way to implement the inversion and the affine transformation described in the AES to get the final SBox. …

CFB works as a stream cipher, where the random stream is generated encrypting the previous block of ciphertext. Then, the plaintext is just xored with this random generated stream. To decrypt a pa …

To encrypt a file one draw a random secret ket to be used with AES, he draws also a random IV and a nonce and potentially an AAD. … You use your private key to decrypt the secret key used with AES-GCM and then decrypt the file. In your question you mistaken the use of public and private key. …