PapaK PapaK 4 4 silver badges 6 6 bronze badges. Add a comment. Not a complete answer but an expansion of how salting works that was too long for a comment..
Note that this isn't a complete explanation. Some other things to consider: There's no such thing as a random number in this context, only cryptographically secure random numbers - and how random they are is complex, related to entropy and other fun stuff.
How quickly the hash is computed is a major factor with regards to hampering brute-forcing - hash algorithms like bcrypt are designed to be computationally expensive. Basic Basic Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Making Agile work for data science. Stack Gives Back Featured on Meta. How does it address the issues in stackoverflow.
Does it use authenticated encryption? Does it avoid side channel vulnerabilities and ensure constant-time equality checks? Does it use a suitable mode of operation? Does it generate random IV's properly? Updated PHP 7 ready version.
This is better and much safer version. Thanks, it works as expected too. But, Encrypted Text changed everytime, How can I compare stored encrypted string with it? Thank You!!! I used this in my project with some changes in order to use it statically. Thank you!!!! Ascon Ascon 1 1 silver badge 5 5 bronze badges.
Can this be a replacement to stackoverflow. I've using the former until my host upgraded to PHP 7. This is Super!
Be that as it may, have fun :. BrianH BrianH 2, 13 13 silver badges 20 20 bronze badges. But some issues. Can't i get simple characters? Like: 2a2ffa8fbefbee23b2c. If you need it to be human readable, use base64 or hex encoding on it. This is an application of the Pigeonhole principle. DES is easily breakable and not secure anymore. I've googled but I seems I can't hit the correct keywords to get good results. Show 3 more comments. Marco Concas Marco Concas 1, 14 14 silver badges 21 21 bronze badges.
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Linked 6. See more linked questions. Related Do not use ECB in your code. See Scott's answer for a good solution. I got it on myself. Actually i found some answer on google and just modified something. The result is completely insecure however. Solution 1: Before you do anything further, seek to understand the difference between encryption and authentication , and why you probably want authenticated encryption rather than just encryption. Additionally, ChaCha20 and Salsa20 provided by libsodium are stream ciphers and do not need special modes.
If it fails, abort. Decrypt the message. Other Design Considerations: Do not compress anything ever. Ciphertext is not compressible; compressing plaintext before encryption can lead to information leaks e. Avoid them if possible. Related How to store sensitive information that needs to be shared across different users?
Note that you're adding extra work and could just use this constant as the key and save yourself a lot of heartache! Then use PBKDF2 like so to derive a suitable encryption key from your password rather than encrypting with your password directly.
I'm late to the party, but searching for the correct way to do it I came across this page it was one of the top Google search returns, so I will like to share my view on the problem, which I consider it to be up to date at the time of writing this post beginning of From PHP 7.
Important : This uses ECB mode , which isn't secure. If you want a simple solution without taking a crash course in cryptography engineering, don't write it yourself, just use a library. You can use any other chipper methods as well, depending on your security need. ECB is not an encryption mode, it's only a building block. Using ECB as demonstrated in this answer does not actually encrypt the string securely. Do not use ECB in your code. See Scott's answer for a good solution.
I got it on myself. Actually i found some answer on google and just modified something. The result is completely insecure however.
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