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3 questions
0
votes
1
answer
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CBC-MAC 8 octet ICV compatable with 16 octet block size?
I'm trying to use DTLS in Preshared key mode for CoAP which necessitates using CipherSuite TLS_PSK_WITH_AES_128_CCM_8
I'm trying to start with the CBC-MAC but I'm not sure how to get an 8 octet ICV ...
- 103
0
votes
1
answer
562
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Enc-Mac (AES CTR+CBC) mixing AES-256 and AES-128 and splitting keys
I'm looking to accomplish a Enc-then-Mac approach using
AES-CTR
and
ECBC-MAC
Now ECBC-MAC requires 2 distinct keys, one for the MAC, and one to encrypt the Tag.
If I do this:
Use AES256-CTR for the ...
- 1
2
votes
1
answer
2k
views
CBC-MAC: is it secure to authenticate a fixed length ciphertext?
Suppose I have a fixed-length arbitrary ciphertext.
To authenticate such ciphertext:
I generate a random AES Key $K_{auth}$.
Then I compute the CBC-MAC Tag of the ciphertext with $K_{auth}$.
Finally,...
- 23