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Losing the Initialization Vector in Cipher Block Chaining
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Losing the Initialization Vector in Cipher Block Chaining
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I have written a message and encrypted it using cipher block chaining.
What will happen if the receiver loses the Initialization Vector, or doesn't receive at all?
decryption ciphers
edited 2 hours ago
Johnny
691116
asked 4 hours ago
Ahmed IraqiAhmed Iraqi
1
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Ahmed Iraqi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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I have written a message and encrypted it using cipher block chaining.
What will happen if the receiver loses the Initialization Vector, or doesn't receive at all?
decryption ciphers
edited 2 hours ago
Johnny
691116
asked 4 hours ago
Ahmed IraqiAhmed Iraqi
1
New contributor
Ahmed Iraqi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have written a message and encrypted it using cipher block chaining.
What will happen if the receiver loses the Initialization Vector, or doesn't receive at all?
decryption ciphers
edited 2 hours ago
Johnny
691116
asked 4 hours ago
Ahmed IraqiAhmed Iraqi
1
New contributor
Ahmed Iraqi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have written a message and encrypted it using cipher block chaining.
What will happen if the receiver loses the Initialization Vector, or doesn't receive at all?
decryption ciphers
decryption ciphers
edited 2 hours ago
Johnny
691116
asked 4 hours ago
Ahmed IraqiAhmed Iraqi
1
New contributor
Ahmed Iraqi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 2 hours ago
Johnny
691116
asked 4 hours ago
Ahmed IraqiAhmed Iraqi
1
New contributor
Ahmed Iraqi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 2 hours ago
Johnny
691116
edited 2 hours ago
Johnny
691116
edited 2 hours ago
Johnny
691116
691116
asked 4 hours ago
Ahmed IraqiAhmed Iraqi
1
New contributor
Ahmed Iraqi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
Ahmed IraqiAhmed Iraqi
1
asked 4 hours ago
Ahmed IraqiAhmed Iraqi
1
1
New contributor
Ahmed Iraqi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Ahmed Iraqi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Ahmed Iraqi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
2 Answers
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In a cipher block chain, each block is XORed with the ciphertext of the previous block, not the plaintext. So even if you cannot decipher one block, as long as you have received the complete block intact and correct, you can still use it to decipher the next one.
So, if your receiver doesn't have the Initialization Vector, they will be unable to decipher the first block they receive. But as long as they receive the first block, they will still successfully decipher the second (and each successive) block.
answered 4 hours ago
JohnnyJohnny
691116
add a comment |
When decrypting a message in CBC mode, each ciphertext block ci is decrypted with the chosen key, and then XORed with the previous ciphertext block ci-1.
Since for c1, there is c0, we use the IV instead. So if the receiver knows the ciphertext and the key used to encrypt it, but not the IV, they can decrypt everything apart from the first block.
EDIT: beaten to it by 20 seconds...
answered 4 hours ago
TheWolfTheWolf
843512
add a comment |
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2 Answers
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2 Answers
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In a cipher block chain, each block is XORed with the ciphertext of the previous block, not the plaintext. So even if you cannot decipher one block, as long as you have received the complete block intact and correct, you can still use it to decipher the next one.
So, if your receiver doesn't have the Initialization Vector, they will be unable to decipher the first block they receive. But as long as they receive the first block, they will still successfully decipher the second (and each successive) block.
answered 4 hours ago
JohnnyJohnny
691116
add a comment |
In a cipher block chain, each block is XORed with the ciphertext of the previous block, not the plaintext. So even if you cannot decipher one block, as long as you have received the complete block intact and correct, you can still use it to decipher the next one.
So, if your receiver doesn't have the Initialization Vector, they will be unable to decipher the first block they receive. But as long as they receive the first block, they will still successfully decipher the second (and each successive) block.
answered 4 hours ago
JohnnyJohnny
691116
add a comment |
In a cipher block chain, each block is XORed with the ciphertext of the previous block, not the plaintext. So even if you cannot decipher one block, as long as you have received the complete block intact and correct, you can still use it to decipher the next one.
So, if your receiver doesn't have the Initialization Vector, they will be unable to decipher the first block they receive. But as long as they receive the first block, they will still successfully decipher the second (and each successive) block.
answered 4 hours ago
JohnnyJohnny
691116
In a cipher block chain, each block is XORed with the ciphertext of the previous block, not the plaintext. So even if you cannot decipher one block, as long as you have received the complete block intact and correct, you can still use it to decipher the next one.
So, if your receiver doesn't have the Initialization Vector, they will be unable to decipher the first block they receive. But as long as they receive the first block, they will still successfully decipher the second (and each successive) block.
answered 4 hours ago
JohnnyJohnny
691116
answered 4 hours ago
JohnnyJohnny
691116
answered 4 hours ago
JohnnyJohnny
691116
answered 4 hours ago
JohnnyJohnny
691116
691116
add a comment |
add a comment |
When decrypting a message in CBC mode, each ciphertext block ci is decrypted with the chosen key, and then XORed with the previous ciphertext block ci-1.
Since for c1, there is c0, we use the IV instead. So if the receiver knows the ciphertext and the key used to encrypt it, but not the IV, they can decrypt everything apart from the first block.
EDIT: beaten to it by 20 seconds...
answered 4 hours ago
TheWolfTheWolf
843512
add a comment |
When decrypting a message in CBC mode, each ciphertext block ci is decrypted with the chosen key, and then XORed with the previous ciphertext block ci-1.
Since for c1, there is c0, we use the IV instead. So if the receiver knows the ciphertext and the key used to encrypt it, but not the IV, they can decrypt everything apart from the first block.
EDIT: beaten to it by 20 seconds...
answered 4 hours ago
TheWolfTheWolf
843512
add a comment |
When decrypting a message in CBC mode, each ciphertext block ci is decrypted with the chosen key, and then XORed with the previous ciphertext block ci-1.
Since for c1, there is c0, we use the IV instead. So if the receiver knows the ciphertext and the key used to encrypt it, but not the IV, they can decrypt everything apart from the first block.
EDIT: beaten to it by 20 seconds...
answered 4 hours ago
TheWolfTheWolf
843512
When decrypting a message in CBC mode, each ciphertext block ci is decrypted with the chosen key, and then XORed with the previous ciphertext block ci-1.
Since for c1, there is c0, we use the IV instead. So if the receiver knows the ciphertext and the key used to encrypt it, but not the IV, they can decrypt everything apart from the first block.
EDIT: beaten to it by 20 seconds...
answered 4 hours ago
TheWolfTheWolf
843512
answered 4 hours ago
TheWolfTheWolf
843512
answered 4 hours ago
TheWolfTheWolf
843512
answered 4 hours ago
TheWolfTheWolf
843512
843512
add a comment |
add a comment |
Ahmed Iraqi is a new contributor. Be nice, and check out our Code of Conduct.
Ahmed Iraqi is a new contributor. Be nice, and check out our Code of Conduct.
Ahmed Iraqi is a new contributor. Be nice, and check out our Code of Conduct.
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