NET Framework Getting started with. NET with Newtonsoft. Diagnostics System. IO System. File class System. Mail System. Emit namespace System. Only in this scenario, the quick-and-dirty solution can be considered better than jbtule's solution, due to lower maintanance. Original post: I found jbtule 's answer a bit complicated for a quick and dirty secured AES string encryption and Brett 's answer had a bug with the Initialization Vector being a fixed value making it vulnerable to padding attacks, so I fixed Brett's code and added a random IV that is added to the chipered string, creating a different encrypted value each and every encryption of the same value:.
Replace EncryptionKey with your key. In my implementation, the key is being saved in the configuration file web. The configuration file should be also encrypted so the key won't be saved as clear text in it.
With the reference of Encrypt and Decrypt a String in c , I found one of good solution :. To support mattmanser answer.
It wraps the libsodium C library. The down side is that it won't work at all if the CPU doesn't have the extension. There's no software fall back. The following code is an improved version of Ghazal's answer to a similar question. This is the class that was placed here by Brett. However I made a slight edit since I was receiving the error 'Invalid length for a Base char array' when using it for URL strings to encrypt and decrypt.
Encryption is a very common matter in programming. I think it is better to install a package to do the task for you. The key is in the config file and therefore it is easy to change in the production environment, and I don't see any drawbacks. Copied in my answer here from a similar question: Simple two-way encryption for C. I tried different solutions but this works best for me, some have bugs but this is perfect for me.
I have an open source project called XCrypto that leverages certificates to encrypt and decrypt strings. It's very easy to use. Here is an example for how to use it:. Once you have an XAlias established with your secret s added, it is trivial to retreive them in your program with the Org.
XCrypto nuget package installed:. NET framework 4 and fully working also for limited platforms, as. NET framework! You have to use the namespace using System. Cryptography; and useHashing is a bool type either true or false. String variable "key" should be same for Encryption and for Decryption.
A good algorithm to securely hash data is BCrypt :. Besides incorporating a salt to protect against rainbow table attacks, bcrypt is an adaptive function: over time, the iteration count can be increased to make it slower, so it remains resistant to brute-force search attacks even with increasing computation power.
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Asked 13 years, 3 months ago. Active 8 months ago. Viewed k times. Improve this question. Nisarg NotDan NotDan Check this link codeproject.
Needed something simple NET 4. GCM fails catastrophically if you ever reuse a nonce. Sid Nonce reuse is a bad idea, yes. Show 4 more comments. Active Oldest Votes. Also too much work to alter this answer otherwise. The sharedSecret parameters must match. GetBytes aesAlg. CreateEncryptor aesAlg. Key, aesAlg. Write BitConverter. Length , 0, sizeof int ; msEncrypt. Write aesAlg.
IV, 0, aesAlg. ToBase64String msEncrypt. CreateDecryptor aesAlg. Read rawLength, 0, rawLength. ToInt32 rawLength, 0 ]; if s. Read buffer, 0, buffer. Improve this answer. Community Bot 1 1 1 silver badge. Brett Brett 8, 5 5 gold badges 36 36 silver badges 51 51 bronze badges. To Bret - hi thx for your example.
ComputeHash UE. The above code is not secure, it breaks the most basic rule of semantic security with aes, you should NEVER use the same IV more than once with the same key. This always gives an identical IV every time you use the same key. Using a salt in the key-derivation process wouldn't hurt.
A constant isn't a good salt, just like a constant isn't a good IV. Concerning the AES vs. Rijndael confusion: AES is a subset of Rijndael. If you use Rijndael with bit blocks and either , or bit keys you're using AES. The salt adds a degree of obfuscation to prevent cracking. Recommend that you read jbtules examples below where the salt is generated. Show 13 more comments. Modern Examples of Symmetric Authenticated Encryption of a string. IO; using System.
Cryptography; using System. Write cipherText ; binaryWriter. ComputeHash encryptedStream. ComputeHash encryptedMessage, 0, encryptedMessage. Length - sentTag. Copy encryptedMessage, encryptedMessage. Length, sentTag, 0, sentTag. Copy encryptedMessage, nonSecretPayloadLength, iv, 0, iv. Length, encryptedMessage. Length - nonSecretPayloadLength - iv.
IsNullOrWhiteSpace password password. Length]; Array. Copy nonSecretPayload, payload, nonSecretPayload. Copy salt, 0, payload, payloadIndex, salt. Length ; Array. Length, authSalt, 0, authSalt. Text; using Org. Crypto; using Org. Engines; using Org. Generators; using Org. Modes; using Org. Parameters; using Org. NextBytes nonce, 0, nonce. GetOutputSize secretMessage. ProcessBytes secretMessage, 0, secretMessage. Length, cipherText, 0 ; cipher. ReadBytes encryptedMessage.
Length - nonSecretPayloadLength - nonce. GetOutputSize cipherText. ProcessBytes cipherText, 0, cipherText. Length, plainText, 0 ; cipher. For encryption and decryption , we have used 3 as a key value. Similarly, for decrypting the string , 3 is subtracted from the ASCII value of the characters to print an original string. In the above program, we have used simple logic for encrypting and decrypting a given string by simply adding and subtracting the particular key from ASCII value.
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For more security you can use multiple encryption.
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