Is RSA algorithm secure if I have fixed message pool and an interceptor have also the message pool?
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Suppose I have a fixed message pool of 1000 messages, person A is sending message from this fixed message pool to person B using RSA.
If an interceptor also have the message pool he can precompute all the encrypted messages using B's public key. Now if he intercept A's message can he surely tell which message A has sent to B?
In this case should we use RSA only for a symmetric key exchange and then messages should be encrypted using a symmetric algorithm?
cryptography rsa
asked Nov 22 at 10:41
Habibullah Araphat
11
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up vote
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down vote
favorite
Suppose I have a fixed message pool of 1000 messages, person A is sending message from this fixed message pool to person B using RSA.
If an interceptor also have the message pool he can precompute all the encrypted messages using B's public key. Now if he intercept A's message can he surely tell which message A has sent to B?
In this case should we use RSA only for a symmetric key exchange and then messages should be encrypted using a symmetric algorithm?
cryptography rsa
asked Nov 22 at 10:41
Habibullah Araphat
11
1
Yes, provided you use it properly (by adding randomized padding to all your plaintext messages).
– squeamish ossifrage
Nov 22 at 12:04
In this case why doesn't rsa use randomise padding to make the encryption more secure?
– Habibullah Araphat
Nov 22 at 16:39
The premise of your question is false. Randomized padding is an essential part of the RSA algorithm.
– squeamish ossifrage
Nov 22 at 17:04
Got it. Thanks.
– Habibullah Araphat
Nov 22 at 17:54
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
Suppose I have a fixed message pool of 1000 messages, person A is sending message from this fixed message pool to person B using RSA.
If an interceptor also have the message pool he can precompute all the encrypted messages using B's public key. Now if he intercept A's message can he surely tell which message A has sent to B?
In this case should we use RSA only for a symmetric key exchange and then messages should be encrypted using a symmetric algorithm?
cryptography rsa
asked Nov 22 at 10:41
Habibullah Araphat
11
Suppose I have a fixed message pool of 1000 messages, person A is sending message from this fixed message pool to person B using RSA.
If an interceptor also have the message pool he can precompute all the encrypted messages using B's public key. Now if he intercept A's message can he surely tell which message A has sent to B?
In this case should we use RSA only for a symmetric key exchange and then messages should be encrypted using a symmetric algorithm?
cryptography rsa
cryptography rsa
asked Nov 22 at 10:41
Habibullah Araphat
11
asked Nov 22 at 10:41
Habibullah Araphat
11
asked Nov 22 at 10:41
Habibullah Araphat
11
asked Nov 22 at 10:41
Habibullah Araphat
11
asked Nov 22 at 10:41
Habibullah Araphat
11
11
1
Yes, provided you use it properly (by adding randomized padding to all your plaintext messages).
– squeamish ossifrage
Nov 22 at 12:04
In this case why doesn't rsa use randomise padding to make the encryption more secure?
– Habibullah Araphat
Nov 22 at 16:39
The premise of your question is false. Randomized padding is an essential part of the RSA algorithm.
– squeamish ossifrage
Nov 22 at 17:04
Got it. Thanks.
– Habibullah Araphat
Nov 22 at 17:54
add a comment |
1
Yes, provided you use it properly (by adding randomized padding to all your plaintext messages).
– squeamish ossifrage
Nov 22 at 12:04
In this case why doesn't rsa use randomise padding to make the encryption more secure?
– Habibullah Araphat
Nov 22 at 16:39
The premise of your question is false. Randomized padding is an essential part of the RSA algorithm.
– squeamish ossifrage
Nov 22 at 17:04
Got it. Thanks.
– Habibullah Araphat
Nov 22 at 17:54
1
1
Yes, provided you use it properly (by adding randomized padding to all your plaintext messages).
– squeamish ossifrage
Nov 22 at 12:04
Yes, provided you use it properly (by adding randomized padding to all your plaintext messages).
– squeamish ossifrage
Nov 22 at 12:04
In this case why doesn't rsa use randomise padding to make the encryption more secure?
– Habibullah Araphat
Nov 22 at 16:39
In this case why doesn't rsa use randomise padding to make the encryption more secure?
– Habibullah Araphat
Nov 22 at 16:39
The premise of your question is false. Randomized padding is an essential part of the RSA algorithm.
– squeamish ossifrage
Nov 22 at 17:04
The premise of your question is false. Randomized padding is an essential part of the RSA algorithm.
– squeamish ossifrage
Nov 22 at 17:04
Got it. Thanks.
– Habibullah Araphat
Nov 22 at 17:54
Got it. Thanks.
– Habibullah Araphat
Nov 22 at 17:54
add a comment |
1 Answer
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0
down vote
The text-book RSA encryption algorithm is deterministic. But the official RSA specifications (and also all implementations used in practice) include some (partly random) padding, so we don't actually encrypt plaintext, but pad(plaintext). So the above mentioned problem will not occur.
More details can be found in this answer https://stackoverflow.com/a/7933071/10690480
answered Nov 22 at 18:55
Habibullah Araphat
11
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
The text-book RSA encryption algorithm is deterministic. But the official RSA specifications (and also all implementations used in practice) include some (partly random) padding, so we don't actually encrypt plaintext, but pad(plaintext). So the above mentioned problem will not occur.
More details can be found in this answer https://stackoverflow.com/a/7933071/10690480
answered Nov 22 at 18:55
Habibullah Araphat
11
add a comment |
up vote
0
down vote
The text-book RSA encryption algorithm is deterministic. But the official RSA specifications (and also all implementations used in practice) include some (partly random) padding, so we don't actually encrypt plaintext, but pad(plaintext). So the above mentioned problem will not occur.
More details can be found in this answer https://stackoverflow.com/a/7933071/10690480
answered Nov 22 at 18:55
Habibullah Araphat
11
add a comment |
up vote
0
down vote
up vote
0
down vote
The text-book RSA encryption algorithm is deterministic. But the official RSA specifications (and also all implementations used in practice) include some (partly random) padding, so we don't actually encrypt plaintext, but pad(plaintext). So the above mentioned problem will not occur.
More details can be found in this answer https://stackoverflow.com/a/7933071/10690480
answered Nov 22 at 18:55
Habibullah Araphat
11
The text-book RSA encryption algorithm is deterministic. But the official RSA specifications (and also all implementations used in practice) include some (partly random) padding, so we don't actually encrypt plaintext, but pad(plaintext). So the above mentioned problem will not occur.
More details can be found in this answer https://stackoverflow.com/a/7933071/10690480
answered Nov 22 at 18:55
Habibullah Araphat
11
answered Nov 22 at 18:55
Habibullah Araphat
11
answered Nov 22 at 18:55
Habibullah Araphat
11
answered Nov 22 at 18:55
Habibullah Araphat
11
11
add a comment |
add a comment |
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Yes, provided you use it properly (by adding randomized padding to all your plaintext messages).
– squeamish ossifrage
Nov 22 at 12:04
In this case why doesn't rsa use randomise padding to make the encryption more secure?
– Habibullah Araphat
Nov 22 at 16:39
The premise of your question is false. Randomized padding is an essential part of the RSA algorithm.
– squeamish ossifrage
Nov 22 at 17:04
Got it. Thanks.
– Habibullah Araphat
Nov 22 at 17:54