IPsec : transmission of Initialization VectorWhy is the IV passed in the clear when it can be easily encrypted?Encryption with “constant” initialization vector considered harmfulWhy should I use an Initialization Vector (IV) when I have unique keys?Is it bad practice to use the message digest of the plaintext as the initialization vector?Is IPsec IND-CCA secure provided the used block cipher is a pseudorandom function?Two or more initialization vectors with the same keyAES CBC Initialization vector - Security issuesESP in tunnel modeCipher Block Chain continued Initialization Vectorwhy IPSec transport mode is restricted for host-to-host communication , or host-to-gateway where gateway acts as a host only?How does OpenVPN work?
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IPsec : transmission of Initialization Vector
Why is the IV passed in the clear when it can be easily encrypted?Encryption with “constant” initialization vector considered harmfulWhy should I use an Initialization Vector (IV) when I have unique keys?Is it bad practice to use the message digest of the plaintext as the initialization vector?Is IPsec IND-CCA secure provided the used block cipher is a pseudorandom function?Two or more initialization vectors with the same keyAES CBC Initialization vector - Security issuesESP in tunnel modeCipher Block Chain continued Initialization Vectorwhy IPSec transport mode is restricted for host-to-host communication , or host-to-gateway where gateway acts as a host only?How does OpenVPN work?
$begingroup$
I am currently carrying scholar research about IPsec protocol, and I have a question regarding the IP Encapsulating Security Payload (ESP). Is the initialization vector of operation mode transmitted in clear in the message ESP Payload ? If it is transmitted in clear, why is it not a security issue ?
initialization-vector ipsec
edited Mar 29 at 13:42
Ella Rose♦
17.1k44586
asked Mar 29 at 9:41
CedricCedric
283
$endgroup$
add a comment |
$begingroup$
I am currently carrying scholar research about IPsec protocol, and I have a question regarding the IP Encapsulating Security Payload (ESP). Is the initialization vector of operation mode transmitted in clear in the message ESP Payload ? If it is transmitted in clear, why is it not a security issue ?
initialization-vector ipsec
edited Mar 29 at 13:42
Ella Rose♦
17.1k44586
asked Mar 29 at 9:41
CedricCedric
283
$endgroup$
1
$begingroup$
Related: crypto.stackexchange.com/questions/2280/…
$endgroup$
– Ilmari Karonen
Mar 29 at 16:22
add a comment |
$begingroup$
I am currently carrying scholar research about IPsec protocol, and I have a question regarding the IP Encapsulating Security Payload (ESP). Is the initialization vector of operation mode transmitted in clear in the message ESP Payload ? If it is transmitted in clear, why is it not a security issue ?
initialization-vector ipsec
edited Mar 29 at 13:42
Ella Rose♦
17.1k44586
asked Mar 29 at 9:41
CedricCedric
283
$endgroup$
I am currently carrying scholar research about IPsec protocol, and I have a question regarding the IP Encapsulating Security Payload (ESP). Is the initialization vector of operation mode transmitted in clear in the message ESP Payload ? If it is transmitted in clear, why is it not a security issue ?
initialization-vector ipsec
initialization-vector ipsec
edited Mar 29 at 13:42
Ella Rose♦
17.1k44586
asked Mar 29 at 9:41
CedricCedric
283
edited Mar 29 at 13:42
Ella Rose♦
17.1k44586
asked Mar 29 at 9:41
CedricCedric
283
edited Mar 29 at 13:42
Ella Rose♦
17.1k44586
edited Mar 29 at 13:42
Ella Rose♦
17.1k44586
edited Mar 29 at 13:42
Ella Rose♦
17.1k44586
17.1k44586
asked Mar 29 at 9:41
CedricCedric
283
asked Mar 29 at 9:41
CedricCedric
283
asked Mar 29 at 9:41
CedricCedric
283
283
1
$begingroup$
Related: crypto.stackexchange.com/questions/2280/…
$endgroup$
– Ilmari Karonen
Mar 29 at 16:22
add a comment |
1
$begingroup$
Related: crypto.stackexchange.com/questions/2280/…
$endgroup$
– Ilmari Karonen
Mar 29 at 16:22
1
1
$begingroup$
Related: crypto.stackexchange.com/questions/2280/…
$endgroup$
– Ilmari Karonen
Mar 29 at 16:22
$begingroup$
Related: crypto.stackexchange.com/questions/2280/…
$endgroup$
– Ilmari Karonen
Mar 29 at 16:22
add a comment |
1 Answer
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$begingroup$
Yes, the initialization vector is transmitted in the clear as first part of the ESP payload data (see RFC 4303, section 2, and the RFCs that define the use of specific algorithm with ESP, e.g. RFC 3602, section 3 for AES-CBC, or RFC 4106, section 3 for AES-GCM).
The security of the encryption and integrity protection does not depend on the IV being kept secret. Its primary use is that of a nonce to ensure encrypting the same data with the same key does not result in the same ciphertext.
Some algorithms require that the IV is random/unpredictable (e.g. AES-CBC) but in many modern combined mode algorithms (e.g. AES-GCM or ChaCha20/Poly1305) it just must not repeat and can simply be a counter.
Under certain conditions it might not even be necessary to transmit the IV, for instance, because it can be derived from other information, like the sequence number in ESP. Therefore, there is currently an internet draft under discussion that proposes to omit the IV for certain algorithms (e.g. AES-GCM) and instead just use the (extended) sequence number, which is what's generally already used anyway, it's just transmitted twice in each message.
answered Mar 29 at 10:48
ecdsaecdsa
1562
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add a comment |
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$begingroup$
Yes, the initialization vector is transmitted in the clear as first part of the ESP payload data (see RFC 4303, section 2, and the RFCs that define the use of specific algorithm with ESP, e.g. RFC 3602, section 3 for AES-CBC, or RFC 4106, section 3 for AES-GCM).
The security of the encryption and integrity protection does not depend on the IV being kept secret. Its primary use is that of a nonce to ensure encrypting the same data with the same key does not result in the same ciphertext.
Some algorithms require that the IV is random/unpredictable (e.g. AES-CBC) but in many modern combined mode algorithms (e.g. AES-GCM or ChaCha20/Poly1305) it just must not repeat and can simply be a counter.
Under certain conditions it might not even be necessary to transmit the IV, for instance, because it can be derived from other information, like the sequence number in ESP. Therefore, there is currently an internet draft under discussion that proposes to omit the IV for certain algorithms (e.g. AES-GCM) and instead just use the (extended) sequence number, which is what's generally already used anyway, it's just transmitted twice in each message.
answered Mar 29 at 10:48
ecdsaecdsa
1562
$endgroup$
add a comment |
$begingroup$
Yes, the initialization vector is transmitted in the clear as first part of the ESP payload data (see RFC 4303, section 2, and the RFCs that define the use of specific algorithm with ESP, e.g. RFC 3602, section 3 for AES-CBC, or RFC 4106, section 3 for AES-GCM).
The security of the encryption and integrity protection does not depend on the IV being kept secret. Its primary use is that of a nonce to ensure encrypting the same data with the same key does not result in the same ciphertext.
Some algorithms require that the IV is random/unpredictable (e.g. AES-CBC) but in many modern combined mode algorithms (e.g. AES-GCM or ChaCha20/Poly1305) it just must not repeat and can simply be a counter.
Under certain conditions it might not even be necessary to transmit the IV, for instance, because it can be derived from other information, like the sequence number in ESP. Therefore, there is currently an internet draft under discussion that proposes to omit the IV for certain algorithms (e.g. AES-GCM) and instead just use the (extended) sequence number, which is what's generally already used anyway, it's just transmitted twice in each message.
answered Mar 29 at 10:48
ecdsaecdsa
1562
$endgroup$
add a comment |
$begingroup$
Yes, the initialization vector is transmitted in the clear as first part of the ESP payload data (see RFC 4303, section 2, and the RFCs that define the use of specific algorithm with ESP, e.g. RFC 3602, section 3 for AES-CBC, or RFC 4106, section 3 for AES-GCM).
The security of the encryption and integrity protection does not depend on the IV being kept secret. Its primary use is that of a nonce to ensure encrypting the same data with the same key does not result in the same ciphertext.
Some algorithms require that the IV is random/unpredictable (e.g. AES-CBC) but in many modern combined mode algorithms (e.g. AES-GCM or ChaCha20/Poly1305) it just must not repeat and can simply be a counter.
Under certain conditions it might not even be necessary to transmit the IV, for instance, because it can be derived from other information, like the sequence number in ESP. Therefore, there is currently an internet draft under discussion that proposes to omit the IV for certain algorithms (e.g. AES-GCM) and instead just use the (extended) sequence number, which is what's generally already used anyway, it's just transmitted twice in each message.
answered Mar 29 at 10:48
ecdsaecdsa
1562
$endgroup$
Yes, the initialization vector is transmitted in the clear as first part of the ESP payload data (see RFC 4303, section 2, and the RFCs that define the use of specific algorithm with ESP, e.g. RFC 3602, section 3 for AES-CBC, or RFC 4106, section 3 for AES-GCM).
The security of the encryption and integrity protection does not depend on the IV being kept secret. Its primary use is that of a nonce to ensure encrypting the same data with the same key does not result in the same ciphertext.
Some algorithms require that the IV is random/unpredictable (e.g. AES-CBC) but in many modern combined mode algorithms (e.g. AES-GCM or ChaCha20/Poly1305) it just must not repeat and can simply be a counter.
Under certain conditions it might not even be necessary to transmit the IV, for instance, because it can be derived from other information, like the sequence number in ESP. Therefore, there is currently an internet draft under discussion that proposes to omit the IV for certain algorithms (e.g. AES-GCM) and instead just use the (extended) sequence number, which is what's generally already used anyway, it's just transmitted twice in each message.
answered Mar 29 at 10:48
ecdsaecdsa
1562
answered Mar 29 at 10:48
ecdsaecdsa
1562
answered Mar 29 at 10:48
ecdsaecdsa
1562
answered Mar 29 at 10:48
ecdsaecdsa
1562
1562
add a comment |
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