Linked Questions

2 votes
2 answers
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Key Exhaustion Risks in Symmetric and Asymmetric Cryptography

For the symetric keys it is recommend that the same key should not be used to encrypt large number(2^32) of cipher blocks to avoid the key-exhaustion risk. Curious to know whether the asymmetric key ...
Bhuvan's user avatar
  • 123
0 votes
1 answer
96 views

Do I need to use unique IVs if all encrypted data is unique?

I am designing a service where each user has both a unique 256-bit private and public ID. These IDs should be derivable from one another, but only within the backend of my service (as to not expose ...
Ryan Hilbert's user avatar
1 vote
0 answers
65 views

Weaknesses of AES-GCM [duplicate]

Besides the limited nonce size of 96 bits, are there any other weaknesses to the GCM mode of AES? I am creating a password vault and am trying to narrow down my options of encryption schemes. Also, is ...
Bismofunyuns's user avatar
0 votes
1 answer
71 views

Can we have an asymmetric key in AES? Clarification about PBKDF2 and AES-GCM in WebCrypto

Can we have an asymmetric key in AES? Clarification about PBKDF2 and AES-GCM in WebCrypto According to wikipedia AES page, AES is a symmetric-key algorithm. The algorithm described by AES is a ...
borracciaBlu's user avatar
0 votes
0 answers
88 views

Is it possible to uncover the plaintext if IV is used twice but the key is different?

I am currently working on a cryptography challenge. The program uses AES-GCM to encrypt and decrypt strings. Let's say I have the following: IV which is reused only 1 cipher text authentication tag ...
fdfdfd's user avatar
  • 101
2 votes
1 answer
928 views

What does AES-GCM provide?

I am wondering does AES-GCM which uses Authenticated Encryption provide us with all 3 properties (Authenticity, Confidentiality, and Integrity), or does it not provide integrity?
CryptoGuru's user avatar
4 votes
3 answers
706 views

Why is AES better than one-time pad?

From my limited research into this topic, it seems that AES can be brute-forced. One-time pad, on the other hand, cannot. Why then is it better to use AES than it is to use one-time pad? The only ...
Darcy Sutton's user avatar
0 votes
2 answers
1k views

How is AES256-GCM auth tag used in decryption

I have been playing with AES256-GCM in NodeJS crypto library and it shows that the original message can be decrypted without caring about the auth tag. So can a non-tag verified decryption be secure? ...
Kim Mỹ's user avatar
  • 165
3 votes
2 answers
1k views

For AES-GCM, does knowing plaintext and ciphertext allow attacker to learn the key?

Say, for an AES-GCM encryption, an attacker knows essentially everything except the key. This would include: Plaintext Ciphertext IV Algorithm (AES-GCM) In this case, will the attacker gain any ...
Erik Hermansen's user avatar
0 votes
1 answer
718 views

Alternative to CBC mode encryption?

Given that CBC mode encryption is vulnerable to padding oracle attacks, what is the next best alternative ? a) Include a hash check in the API scheme, validate the hash and then proceed with CBC. If ...
Ravindra HV's user avatar
1 vote
1 answer
157 views

Do I need to change IV in AES-256 GCM when I only use encryption for challenge-response exchange with random string?

When I want to use encryption only for challenge-response exchange and not for hiding the contents of an encrypted message, is it still a threat to me not changing IV for new encryption? For easier ...
krystof18's user avatar
  • 143
2 votes
2 answers
3k views

Which block cipher mode of operation does TLS 1.3 use?

Which block cipher mode of operation does TLS 1.3 use? I assume it is a block cipher mode that provides authentication (like GCM).
Abra Cadabra's user avatar
1 vote
0 answers
41 views

How safe is store nonce with encrypted text? [duplicate]

I am using AESGCM256 with a nonce of 96 bytes to store keys (very secret information). There are more than 500 keys, the only place where they can be stored in ...
riwasat604's user avatar
3 votes
2 answers
5k views

So is AES-256 more secure or less secure than AES-128 after all?

It seems there are attacks that work more effectively on AES-256 than AES-128, which makes it less secure in some cases. But the bigger key size should add some safety margin on the other hand, for ...
Hormoz's user avatar
  • 789
1 vote
2 answers
488 views

Is it cryptographically insecure to use fixed-length AES-GCM messages?

Is there any weaknesses to encrypting fixed-length messages? Should a random amount of padding be added to the message to decrease the odds of some sort of attack?
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