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by Muhammad on December 17, 2015 at 14:40

Thanks for the article, really help my project.
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    By using DH with ephemeral keys (e.g. a new public/private key pair per session) it provides PFS. With DH you are never actually encrypting data with a public key so it doesn’t matter if the private key was ever recovered. Both parties are generating a unique symmetric encryption key from the public/private keys – if they were discovered later on then you still couldn’t use them to decrypt a previous session as keys would be unique per session.

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by Sann-X! on January 14, 2016 at 05:20

Hi,
You wrote:
5. The pseudorandom salt should be a cryptographically secure random number and should be at least the block size of your hashing algorithm (i.e. 160 bits for SHA-1).

But you are wrong. The size of the salt is independant to your choice of hash. See here: http://security.stackexchange.com/a/18006/87096

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    The referenced post also states: “According to the PBKDF2 standard, the minimum recommended size for the salt is 64 bits, though I’d personally recommend 128 bits or higher for a decent safety margin.”

    Recommending that you use at least the block size of your hashing algorithm, provides a decent safety margin and fulfills the recommendation above. Also, according to https://crackstation.net/hashing-security.htm: “To make it impossible for an attacker to create a lookup table for every possible salt, the salt must be long. A good rule of thumb is to use a salt that is the same size as the output of the hash function. For example, the output of SHA256 is 256 bits (32 bytes), so the salt should be at least 32 random bytes.”

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by Sann-X! on January 15, 2016 at 10:47

About https://crackstation.net/hashing-security.htm
I think you need to consider the context. If you need to hash a password you must choose the size of the salt properly. But with PBKDF2 the salt has other goals. Thus I think the size of the salt is independent to your choice of hash.

Also see PBKDF2 java Implementation “F” function (93th string here http://cryptofreek.org/2012/11/29/pbkdf2-pure-java-implementation/ ). And see wiki (https://en.wikipedia.org/wiki/PBKDF2):
“The function F is the xor (^) of c iterations of chained PRFs. The first iteration of PRF uses Password as the PRF key and Salt concatenated with i encoded as a big-endian 32-bit integer.”

Thus if PRF is HMAC-SHA1 then:
U1 = funcHMACSHA1(Password, some_bytes)
where some_byte must have a size atleast SHA1 size – 160 bit. But some_byte is really as (in pseudocode):
some_bytes = Salt || INT_32_BE(i))
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PS
Sorry for my bad english

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    by Chris on January 17, 2016 at 09:38

    Thanks for the references, but I still can’t see why the salt should be limited to 128 bits. The salt is used to initialize PBKDF2 on the first iteration by being concatenated to a 32-bit integer (if dkLen is <= hLen then this integer will normally be 1). When using a 160 bit salt, this results in a 192 bit output (160 + 32) which is then passed to HMAC-SHA-1 as the message with the password. This results in an output of hLen (160 bits) that is then used for further PBKDF2 iterations.

    The length of the message passed to HMAC-SHA1 doesn't have to be limited to hLen (160 bits), so the salt doesn't have to be limited to 128 bits (160 – 32) for SHA-1. If an attacker is attempting to use a pre-computed Rainbow Table with a list of common passwords and salts, then surely having a longer salt reduces the feasibility of this – especially if the user insists on picking a small dictionary based word as their password?

    I think you are saying that there is no direct correlation between hashing function output length (hLen) and the size of the salt – the choice should be made independent of hashing function and would be based on the level of entropy you want to provide. For password hashing this might be the length of your hashing algorithm, but for encryption this might be the length of your encryption key (thus using a 160 bit salt for a 128 bit encryption key makes it easier for someone to attack the key as opposed to the password).

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by SUVRA GUPTA on November 10, 2016 at 11:46

HI how can we generate the same string after encryption.? I have implemented AES/GCM/NoPadding but i need to get the same string after encrypting.
Eg. if ‘Tom’ is encrypted as ‘hzzzzhgft’ . When i again encypt Tom i should recieve the same string. How can we implement that.

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    by Chris on March 1, 2017 at 18:23

    The ciphertext should always be different and that is what the initialisation vector is for (encrypting the same plaintext using the same key and same IV will result in the same ciphertext). To quote the article – “If you use the same key and IV twice then an attacker can potentially decrypt both messages and forge further message โ€“ donโ€™t do it! The IV (or nonce in GCM terms) should be 96-bits as recommended by the spec โ€“ it should be generated in such a way that it is extremely unlikely that you re-use values.”

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by Andri on January 14, 2017 at 03:29

Hai chrish thx for your good work ๐Ÿ™‚ chris if alice and bob want send her ecdsa public key and dart intercept all public key and change with dart public key and send dart signature to alice and bob so dart can mitm?

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    by Chris on March 1, 2017 at 18:28

    Correct – this is always the challenge in public key authentication. That is why you need some way to authenticate that you actually have Alice or Bob’s actual public key. In the article I gave an example of the offline method – both Alice and Bob would compute a SHA-256 hash of their public key and then find a way to exchange them out of band. They could then use those stored hashes to confirm they are actually in possession of the correct public keys.

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by Latha on March 16, 2017 at 10:44

Hi,
Need few more details to use the best technique for data encryption and decryption for passwords and other data.
Can I have a complete program for this requirement.

Thanks in advance.

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by mpaul24 on June 22, 2017 at 01:12

Thanks, it is a great article.

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by Suresh Babu on July 17, 2017 at 10:11

Can you please give the full implementation of PBKDF2WithHmacSHA384 with jdk 1..8?

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    by Chris on July 20, 2018 at 09:35

    In Java 8 you can use the native implementation of PBKDF2WithHmacSHA384 as follows – this will generate a 256 bit key derived from your password (you will need to define PBKDF2Iterations with the number of iterations you require.

    private byte[] deriveKey(String password, byte[] salt, int iterations, int length) throws Exception {   PBEKeySpec ks = new PBEKeySpec(password.toCharArray(), salt, iterations, length);   SecretKeyFactory skf = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA384");   return skf.generateSecret(ks).getEncoded(); }  SecureRandom r = SecureRandom.getInstance("SHA1PRNG"); byte[] salt = new byte[64]; r.nextBytes(salt);  byte[] key = deriveKey("this is my password", salt, PBKDF2Iterations, 256); 
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by Arthur on November 7, 2017 at 10:57

Hello Chris, I have a question.
In your post you warn “Please be aware that the above code doesnโ€™t calculate the HMAC in the recommended way โ€“ it should include the โ€œESALTโ€ otherwise changes to this value would change the decrypted Ciphertext even though it correctly authenticates!”.

Can you please explain what a proper calculation of the HMAC would look like ?

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    by Chris on July 20, 2018 at 09:28

    If you are calculating a HMAC then it should be across all your data – its purpose is to verify that you are seeing the true decrypted string and not something that has been manipulated. In my example I should be performing a HMAC operation across “kLEN || SALT || IV || CIPHERTEXT” – if I only performed the HMAC over the CIPHERTEXT and someone was to change the SALT or IV within the string, then the HMAC would still pass but I would get a completely different decrypted string – this is bad. See the post “Updated Encryption Routines in TemplateFx v2.54” for an updated HMAC routine which calculates it across all the data.

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by Michael on September 16, 2018 at 11:08

Hello Chris, as I can see in your sources you do not specify an individual IV for encryption/decryption but a “nulled one”: c.init(Cipher.ENCRYPT_MODE, eks, new IvParameterSpec(new byte[16])); gives an IV of “00000000000000000000000000000000”.
The created IV is used for PBKDF-functionality. As read many times the IV should be a secured random value so why you use a static IV ?
Kind regards, Michael

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    by Chris on September 16, 2018 at 18:53

    In my example I use a null IV as I am only using the encryption key once – I generate a new key and only encrypt a single piece of data with it. If you plan to use your key more than once than it is absolutely critical then you generate a secured random IV every time. I have addressed this in the Updated Encryption Routines in TemplateFx v2.54 article, where I state: “We generate a 16 byte pseudo-random IV โ€“ this isnโ€™t technically necessary as the routines never use the same key twice, so there is no risk of creating duplicate ciphertext. However, it adds extra protection for anyone who thinks it is a clever idea of re-using the SALT.”

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