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Results tagged with protocol-design
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user 5340
Design of cryptographic protocols, i.e. ways of using algorithms (primitives) to achieve one or more security goals like integrity, confidentiality, authenticity (maybe together with non-security-related goals). If you ask about a specific protocol, tag with its name instead (or additionally, if about its design).
5
votes
1
answer
184
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Do low-entropy fingerprints actually make any sense?
I'm thinking of ZRTP and OTR in particular here. From my understanding, after a Diffie-Hellman session is initiated, the shared secret is then hashed into a 4-digit number, which the two parties can t …
- 1,101
37
votes
4
answers
10k
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Why is plain-hash-then-encrypt not a secure MAC?
It seems that even in MAC-then-encrypt systems like SSL, something like HMAC is used rather than a plain hash. Why?
Suppose we use some stream cipher; then why can't we use $Encrypt(m | H(m))$ as th …
- 1,101
4
votes
What is the lightweight key exchange protocol of choice?
I would personally use triple Diffie-Hellman, which is used often in secure instant-messaging protocols but unfortunately not very well-known beyond that. Essentially, both parties have a long-term id …
- 1,101