# Tag Info

### Triple AES-128 encryption with 2 keys

The academic and regulatory complexity of triple encryption with two keys is nowhere near that of a cipher with twice the key size. There is a line of thought that 2-key 3DES has like 80-bit or even ...
• 142k
Accepted

### Is it possible to perform a meet-in-the-middle within a block cipher?

Meet-in-the-middle attacks can indeed be used for block cipher (but also hash function) cryptanalysis. As mentioned in the question, this goes back to Diffie and Hellman's analysis of DES. However, ...
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### Post quantum hybrid model and its security

If I understand correctly, in hybrid schemes the input date is first encrypted/signed by classical section's algorithm and then the output of classical section is encrypted/signed by the post-quantum ...
• 148k
Accepted

### Double DES meet in the middle attack: number of candidate keys

My question is, where do we get the $2^{64}$ mentioned in the very first sentence? There are a couple of equivalent ways of looking at the problem. One way is to treat 2DES with an incorrect key as ...
• 148k
Accepted

### FIPS 202/SHAKE: insecure 3DES key derivation example

There may well be situations where Eve does not have to trick anybody; in the scenario in FIPS 202 the parties badly use the XOF so the mistake is not necessarily triggered by Eve. The equations in ...
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### Why doesn't TLS provide E2EE?

The question is not correct. Two people can establish direct connection between their laptops in the same network and use TLS (assuming they have share public key in advance). In such case TLS does ...
• 2,621
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### Why doesn't TLS provide E2EE?

TLS encrypts a channel, and that channel is between your browser or app and the Facebook server. E2EE usually refers to the ability to send an encrypted message between two users such that the server ...
• 1,102
Accepted

### Meet in the middle time complexity

What am I missing in my reasoning? Two things: There are other strategies other than sorting to find collisions; one obvious one is to build a huge hash table. Now, in practice, sorting would ...
• 148k
Accepted

### Is double encryption really a bad idea? Are meet-in-the-middle attacks practical at all?

meet-in-the-middle attacks rely on storing the results in a map Only the naive version of MitM does. The impractical memory requirement (size and accesses) of naive MitM can be greatly lowered with ...
• 142k