Linked Questions

1
vote
2answers
4k views

HMAC vs Encrypted Hash

What is best to use (for message integrity) between… AES(Data) + HMAC(Data) AES(Data + HMAC(Data)) AES(Data + Hash(Data)) …and why?
-4
votes
2answers
446 views

AES_256_ENCRYPT_CTR(key, sha-1(plainText)+plainText) VS AES-GCM, which is more secure? [duplicate]

What if we encrypt sha-1 hash of the plain text, along with the plain text using AES-256 in CTR mode? How much future proof the above method would be in comparison to AES-GCM or any other method ...
5
votes
1answer
1k views

CBC-MAC just to verify integrity

I have a message and I want to verify its integrity and authenticity. I have a shared secret (key) that is not used for other encryption. Is it safe to send a plaintext message containing all the ...
0
votes
1answer
5k views

AES standard C library implementation

I'm working to implement AES (128/256 - either) on one of the RISCV ISA processors & later improve performance by introducing a custom instruction in RISCV ISA. I'm a crypto newbie and plan to ...
6
votes
2answers
2k views

Encrypt-then-MAC Confidentiality, Integrity and Authenticity

Does Encrypt-then-MAC provide equal confidentiality, integrity and authenticity as other constructs such as EAX? If yes, how do I go about using it? My current understanding is: E = encrypt(...
2
votes
2answers
2k views

Encrypt-then-MAC paradigm

I read that the Encrypt-then-MAC paradigm is provably secure. From what I understand, when using for example AES for encryption and HMAC_SHA256 for MAC generation (and the keys $K_1 \neq K_2$), this ...
3
votes
1answer
2k views

How is padding oracle attack mitigated by encrypt-then-MAC?

Let us suppose Alice sends a message to Bob. As far as I know, the most popular scheme of MAC-then-encrypt is as follows: Alice computes the HMAC of the plaintext using her private key, and then ...
1
vote
1answer
2k views

Establish a secure connection between a Bluetooth Low Energy device and an Android App using ECDH

Im very new to security and trying to learn how to establish a secure connection between a android application and a Bluetooth Low Energy device with limited hardware performance. The procedure: App:...
3
votes
1answer
4k views

AES-CBC then SHA vs AES-GCM for encrypting and authenticating a web token

I am trying to have something like JWT but kinda ad hoc and encrypted. The token itself is simply a stringified JSON that contains the user ID and Unix timestamp. Now, I tried to use AES-128-GCM, ...
3
votes
1answer
1k views

Using checksum instead of hash for authenticating ciphers

Lets assume for a specific situation we cannot use authenticated encryption like GCM ... If we were to use CTR, what would you think of using a checksum on the plaintext then encrypt the whole. The ...
1
vote
3answers
2k views

Counter based cipher using HMAC-SHA-256

After trying to invent my own AES mode, I decided to just implement something that's known to work, namely CTR mode with HMAC-SHA-256. From what I understand, I can use the IV as a counter, and the ...
3
votes
2answers
2k views

Private RSA key for HMAC key

I am creating software tokens for future request authentication, and I want to use an HMAC for the token to make them tamper-resistant. To ensure I can check the HMAC later I need a secret, persistent ...
-4
votes
1answer
2k views

bruteforce on aes 256 cbc mode [closed]

i have a series of encrypted text , they encrypted by aes 256 bit cbc mode for every encrypted text there is an iv that i have them also and i know its algorithm is aes 256 bit cbc mode i can ...
2
votes
2answers
1k views

Avalanche noise RNG for one-time pad use

I came across this little HRNG widget and was really intrigued as I have been looking for a decent but afordable source for truly random bits to use in a one-time pad. The question is, would a HRNG ...
5
votes
2answers
1k views

Random session key + predictable IV

I'm using Blowfish in a toy Diffie-Hellman communications scheme. Random session keys are generated for each connection. In this case I can simply feed a null array to the IV right? The same ...

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