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Lernmaterialien für SIKA an der TU München

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TESTE DEIN WISSEN
Countermeasures on the level of implementation/circuit design idea
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TESTE DEIN WISSEN
Algebraic: -Masking intermediate values - boolean masking -Randomization intermediate values - blinding in RSA Hiding: -Ab initio intermediate values - reduce leakage at source using special circuit styles -Ad hoc intermediate values - add noise to reduce SNR (signal noise ratio) -shuffle independent operations
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TESTE DEIN WISSEN
Which are the steps for Classical Second Order attacks?
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TESTE DEIN WISSEN
1. Preprocessing: use a combination function to combine points of the power trace (ex. : absolute difference, normalized product ... ) 2.Genuine DPA attack: Perform a first-order DPA attack on the pre-processed power trace.
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TESTE DEIN WISSEN
Which element of the security pyramid has the most abstract level
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TESTE DEIN WISSEN
Apps
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TESTE DEIN WISSEN
Countermeasures on the level of cryptographic primitives
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TESTE DEIN WISSEN
Research just getting started. Crypto primitives are developed. Assumption: The leakage of the key is bounded (the key can be used at least once without revealing the entire key to the attacker.
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TESTE DEIN WISSEN
If the correlation is reduced by square(2) how much the number of traces is changed?
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TESTE DEIN WISSEN
The number of traces is doubled.
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TESTE DEIN WISSEN
Which are the conditions that fulfill the scope of masking against DPA?
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TESTE DEIN WISSEN
1. Masks are uniformly distributed. 2.There is no simultaneous power consumption of the masked value and the mask. 3.The implementation is done carefully
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TESTE DEIN WISSEN
What is DPA?
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TESTE DEIN WISSEN
DPA is a statistical method for analyzing sets of measurements to identify data-dependent correlations
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TESTE DEIN WISSEN
What is the solution for DPA when attacking multiple pair of bits?
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TESTE DEIN WISSEN
Linear Coreelation Coefficient = CPA (Pearson's Correlation Coefficient)
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TESTE DEIN WISSEN
Mention the layers of the security pyramid (abstraction level).
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TESTE DEIN WISSEN
Physical security of implementation: -Semiconductor Physics -Circuit Design/Logic Styles -Basic Arithmetic Units Cryptography: -Crypto Primitives -Protocols Apps
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TESTE DEIN WISSEN
Specify the element of the security pyramid from the less abstract to more abstract.
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TESTE DEIN WISSEN
Semiconductor Circuit design / logic style Basic Arithmetic Units Crypto Primitives Protocols Apps
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TESTE DEIN WISSEN
What exploits DPA?
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TESTE DEIN WISSEN
The power consumption of processing of intermediate values in crypto-algorithm.
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TESTE DEIN WISSEN
What does the strongest attacks on AES require to reveal the entire key?
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TESTE DEIN WISSEN
Require either: -two pair of ciphertext/faulty text-pairs -one ciphertext/faulty text pair and the corresponding plaintext
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Q:
Countermeasures on the level of implementation/circuit design idea
A:
Algebraic: -Masking intermediate values - boolean masking -Randomization intermediate values - blinding in RSA Hiding: -Ab initio intermediate values - reduce leakage at source using special circuit styles -Ad hoc intermediate values - add noise to reduce SNR (signal noise ratio) -shuffle independent operations
Q:
Which are the steps for Classical Second Order attacks?
A:
1. Preprocessing: use a combination function to combine points of the power trace (ex. : absolute difference, normalized product ... ) 2.Genuine DPA attack: Perform a first-order DPA attack on the pre-processed power trace.
Q:
Which element of the security pyramid has the most abstract level
A:
Apps
Q:
Countermeasures on the level of cryptographic primitives
A:
Research just getting started. Crypto primitives are developed. Assumption: The leakage of the key is bounded (the key can be used at least once without revealing the entire key to the attacker.
Q:
If the correlation is reduced by square(2) how much the number of traces is changed?
A:
The number of traces is doubled.
Mehr Karteikarten anzeigen
Q:
Which are the conditions that fulfill the scope of masking against DPA?
A:
1. Masks are uniformly distributed. 2.There is no simultaneous power consumption of the masked value and the mask. 3.The implementation is done carefully
Q:
What is DPA?
A:
DPA is a statistical method for analyzing sets of measurements to identify data-dependent correlations
Q:
What is the solution for DPA when attacking multiple pair of bits?
A:
Linear Coreelation Coefficient = CPA (Pearson's Correlation Coefficient)
Q:
Mention the layers of the security pyramid (abstraction level).
A:
Physical security of implementation: -Semiconductor Physics -Circuit Design/Logic Styles -Basic Arithmetic Units Cryptography: -Crypto Primitives -Protocols Apps
Q:
Specify the element of the security pyramid from the less abstract to more abstract.
A:
Semiconductor Circuit design / logic style Basic Arithmetic Units Crypto Primitives Protocols Apps
Q:
What exploits DPA?
A:
The power consumption of processing of intermediate values in crypto-algorithm.
Q:
What does the strongest attacks on AES require to reveal the entire key?
A:
Require either: -two pair of ciphertext/faulty text-pairs -one ciphertext/faulty text pair and the corresponding plaintext
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