![]() ![]() Thus, even if two users use the same password, their hash values are different because the system generates different salt values for them. The "feed" here is called the "Salt value", and this value is randomly generated by the system and is only known by the system. When the user logs in, the system sprinkles the same "feed" for the user-provided code, then hashes it, compares the hash value, and determines if the password is correct. ![]() The basic idea is this: When the user first provides the password (usually when registering), the system automatically sprinkles some "sorts" into the password and then hashes. The so-called addition of the Salt method is to add a "feeding". We know that if the password is hashed directly, the hacker can get the password of a user by obtaining the hash value of the password and then checking the hash value dictionary (for example, MD5 password cracking website).Īdding Salt can solve this problem to some extent. All Rights Reserved.Use Salt + Hash to encrypt your password Novem09:43:44 wxwzy738 Reads: 20506 Turn: SecretKeyHex = CkCrypt2:: ckHashStringENC(crypt, "mypassword")ĬkCrypt2:: ckSetEncodedKey(crypt,secretKeyHex, "hex")ĭebug "password-based key: " + secretKeyHexĢ000-2023 Chilkat Software, Inc. CkCrypt2:: setCkHashAlgorithm(crypt, "SHA256")ĬkCrypt2:: setCkEncodingMode(crypt, "hex") SHA256 would be the hash of choice because it results in 32-bytes of random-looking key material. Our desired key length in this case is 32 bytes, so we wouldn't want MD5 (16 bytes), nor would we want to use SHA-1 (20 bytes). Alternatively, a password could be hashed using a hash algorithm the results in the desired key length. CkCrypt2:: ckSetEncodedKey(crypt,secretKeyHex, "hex")ĭebug "randomly generated key: " + secretKeyHex It is important that the number of bytes in the secret key matches the value specified in the KeyLength property (above). SecretKeyHex.s = CkPrng:: ckGenRandom(prng, 32, "hex") Generate a 32-byte random secret key, and use it in the crypt object. See Global Unlock Sample for sample code.ĬkCrypt2:: setCkCryptAlgorithm(crypt, "aes") This example assumes the Chilkat API to have been previously unlocked. For example, exchanging the information over a secure TLS (HTTPS) or SSH connection. A long-living secret key could be exchanged via any secure out-of-band means. It is not required to use a key exchange algorithm to achieve the goal of having both sides in possession of the same secret key. They do so using asymmetric encryption algorithms (public/private keys). Key exchange algorithms, such as RSA, ECC, and Diffie-Hellman define secure ways of exchanging symmetric encryption keys. Whichever side generates the key, it must somehow deliver the key to the other side beforehand. Both sides (encryptor and decryptor) must be in possession of the same secret key in order to communicate. In the ChaCha20 algorithm, the key size must always be 256-bits (32-bytes). For example, AES has 3 choices: 128-bit, 192-bit, or 256-bit. Most algorithms define restrictions on key sizes. For example, AES with a 32-byte key is 256-bit AES. The number of bytes in the secret key defines the bit-strength of an encryption algorithm. It should typically be random data, or bytes that resemble random data such as the hash of a password. This could be a "single-use" key that is derived from a secure key exchange algorithm using RSA, ECC, or Diffie-Hellman, or it could be a password known to both sides, or it could simply be the binary bytes of the secret key known in advance on both sides. Symmetric encryption algorithms are such that the encryptor and decryptor share a pre-known secret key. Discusses symmetric encryption key generation techniques for block encryption algorithms such as AES, Blowfish, and Twofish, or for other algorithms such as ChaCha20. ![]()
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