salt

问题 I've created a salt using; md5(rand(0,10000000)); (there is probably a better way?) There doesn't seem to be possible to make a text field unique in MYSQL. So how do I check if the salt has already been used for a previous user? Or should I generate the salt based on the current date/time? as it is impossible for 2 users to register at exactly the same time correct? 回答1: For a salt, uniqueness is more important than length and predictability. You assume the attacker has the salt. A

问题 I am trying to reproduce salted sha256 output from R code in Python: library(openssl) res = sha256("test@gmail.com", key = "111") res # [1] "172f052058445afd9fe3afce05bfec573b5bb4c659bfd4cfc69a59d1597a0031" import hashlib, binascii dk = hashlib.pbkdf2_hmac(='sha256', b'test@gmail.com', b'111', 0) binascii.hexlify(dk) # b'494c86307ffb9e9e31c4ec8782af6498e91272c011a316c242d9164d765be257' How can I make output in python match R? 回答1: I can't quite reproduce your issue. The following keys match

问题 When encrypting a file with OpenSSL, it is possible to use -pass pass:mySillyPassword, where mySillyPassword is the password used in encryption. In addition, it is possible to use a salt, where -salt -s (hex string) is used to specify the salt. Why would someone want to use a password instead of the salt or in conjunction with a salt? Also, I understand just using the -salt command will cause OpenSSL to generate a salt. How is this better than a user-defined salt? If OpenSSL randomly

问题 Since the introduction of Rainbow tables, and using only hashed passwords (e.x: MD5) to stored passwords in database is not the best secured way. When people talk about salted hashes, the always use it in this way hash(password . salt) or even hash(hash(password) . salt) . I don't know why to use salt, and add extra entry for each password to store the salt? Why don't we just use hash(hash(password)) , or even hash(hash(hash(password))) ? Is it more secure to put salt? or just the sense of

问题 I am learning Rails, at the moment, but the answer doesn't have to be Rails specific. So, as I understand it, a secure password system works like this: User creates password System encrypts password with an encryption algorithm (say SHA2). Store hash of encrypted password in database. Upon login attempt: User tries to login System creates hash of attempt with same encryption algorithm System compares hash of attempt with hash of password in the database. If match, they get let in. If not,

问题 This question already has answers here : Secure hash and salt for PHP passwords (14 answers) Closed 5 years ago . $pass="test" the above variable contains a password called test.I want to hash this password using sha512 md5 and salt how do i do that as ive found only benifits of salt and sha512,i allready know md5 encryption.please i need the solution as my system is vunerable and please explain it with a code example because im still attached to md5 from what ive understood by your comments

问题 This question already has answers here : Secure hash and salt for PHP passwords (14 answers) Closed 5 years ago . $pass="test" the above variable contains a password called test.I want to hash this password using sha512 md5 and salt how do i do that as ive found only benifits of salt and sha512,i allready know md5 encryption.please i need the solution as my system is vunerable and please explain it with a code example because im still attached to md5 from what ive understood by your comments

问题 I am generating salt and hash values from my passwords by using, string salt = CreateSalt(TxtPassword.Text.Length); string hash = CreatePasswordHash(TxtPassword.Text, salt); private static string CreateSalt(int size) { //Generate a cryptographic random number. RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider(); byte[] buff = new byte[size]; rng.GetBytes(buff); // Return a Base64 string representation of the random number. return Convert.ToBase64String(buff); } private static string

问题 I am generating salt and hash values from my passwords by using, string salt = CreateSalt(TxtPassword.Text.Length); string hash = CreatePasswordHash(TxtPassword.Text, salt); private static string CreateSalt(int size) { //Generate a cryptographic random number. RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider(); byte[] buff = new byte[size]; rng.GetBytes(buff); // Return a Base64 string representation of the random number. return Convert.ToBase64String(buff); } private static string

问题 I'm in the middle of development and I need to test my login/password api. Problem is in the database the password is encrypted. I have the following information. key iteration salt Is this enough to recover the password? By the way I can edit these values as well if that will help. 回答1: I think you misunderstood, how a password API works. You cannot reverse a properly hashed password, but you can validate an entered password against the stored hash. To validate the entered password, you need