Tagged Questions
3
votes
2answers
151 views
Using the same secret key for encryption and authentication in a Encrypt-then-MAC scheme
Is it a weakness to use a single shared secret for protecting messages using a Encrypt-then-MAC scheme?
Assuming a system is using AES-256-CBC and a SHA1-HMAC and the same secret key for both ...
3
votes
2answers
122 views
RSA digital signature vs authenticated cipher
I want to provide both confidentiality and integrity for data at rest (many large files stored on disk).
I plan to encrypt the data using AES, which will cover the confidentiality requirement.
So ...
8
votes
1answer
207 views
Is Encrypt+HMAC stronger than AEAD?
There are a few posts that I've come across that seem to infer that using regular encryption and a MAC might be better than using the newer AEAD (ie: AES/GCM) modes.
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13
votes
2answers
537 views
What do the magic numbers 0x5c and 0x36 in the opad/ipad calc in HMAC do?
Wikipedia lists the following pseudocode for HMAC:
...
3
votes
2answers
138 views
Is this streamable combination of encryption and MAC secure?
I want to combine encryption and MAC.
For encryption I use AES-256 with CBC and PKCS5Padding.
For MAC I use HmacSHA512.
I use the Encrypt-then-Mac approach (calculate MAC over the ciphertext and ...
1
vote
1answer
160 views
ID-Secret Scheme
I have an ID-Secret scheme and I'd like to hear if there are any vulnerabilities present.
Party 1 and Party 2 hold some credentials, an ID and a Secret.
Party 1 Creates this message:
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