Cryptography Stack Exchange
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Questions tagged [ecb]

Electronic Code Book (ECB) is a mode of operation for a block cipher, with the characteristic that each possible block of plaintext has a defined corresponding ciphertext value and vice versa.

Electronic Code Book (ECB) is a mode of operation for a block cipher, with the characteristic that each possible block of plaintext has a defined corresponding ciphertext value and vice versa.

The same plaintext value will always result in the same ciphertext value. ECB is used when a volume of plain text is separated into several blocks of data, each of which is then encrypted independently of other blocks. Because of this, ECB has the ability to support a separate encryption key for each block type.

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ECB attack to bank transfer

I have a problem with a task from my university. We have two banks and these banks are sending data in ECB mode. Plaintext and ciphertext look like this: Plaintext: sender number | reciver number | amount Ciphertext: block1+block2 | block3+block4 |…
Lucas
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display an image encrypted with ECB

On wikipedia there is an example of a picture encrypted with ECB: http://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Electronic_codebook_.28ECB.29 I just wanted to know how an encrypted file could be displayed as a picture ?
David 天宇 Wong
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How can I encrypt with a matrix key using ECB mode?

Given this plaintext: 101010101010, and the block is 3, with a IV = 000 and the key as k = |1 2 3| |2 1 3| What are the required steps to get the same result like these in ECB mode: c1 = Ek(m1) = 011, c2 = Ek(m2) = 100, c3 = Ek(m3) = 011 et c4 =…
H Aßdøµ
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How can I break this block-cipher?

So we've got to do this assignment for our study, but we can't figure out what to do, can someone help? Assume that Alice and Bob want to communicate via encrypted email. To this end, they first meet in person and agree on a common secret key k and…
Ridatair
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Why can't I use ECB with some obfuscation for transient RAM?

I understand that ECB does not hide data patterns well. But my understanding is that it cannot be broken to "know" the underlying message. If that was the case, why can't ECB be used with some obfuscation technique like say XORing with the address?…
Novice
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How AES diffusion (permutation) does not impact ECB penguin pattern with in each block?

As per my understanding AES introduces diffusion in each block it encrypts even with ECB as mode of operation. If that is the case how the patterns are retained in each block? In this blog https://words.filippo.io/the-ecb-penguin/ penguin outline,…
mee
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What exactly is the problem with using electronic codebooks as a block cipher mode

I was wondering why it is a problem with using ECB as a block cipher mode
Juan
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