# Tag Info

67

An ASN.1-encoded SSH private key contains the following integers in order: The public modulus $n$ and exponent $e$; The private exponent $d$; The prime factors $p$ and $q$ of $n$; The "reduced" private exponents $d_p=d\bmod(p-1)$ and $d_q=d\bmod(q-1)$; The "CRT coefficient" $q_{\text{inv}}=q^{-1}\bmod p$. The observation that the value of $d$ in such a ...

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What you have here is indeed a structure called SubjectPublicKeyInfo. It's usually part of an X.509 certificate, but it is often also used separate from a certificate. It's, for instance, the default encoding for RSA public keys in Java and - if I'm not mistaken - OpenSSL. You can view the complete structure here and compare it with the SubjectPublicKeyInfo ...

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Both the AES key size and the RSA key size matter, because it's no use adding security beyond the weakest link. Here the weakest link is 2048-bit RSA, which is considered roughly equivalent in security to 100-128-bit symmetric keys (depending on who you ask). So having a password with much more than 100 bits of entropy would be fairly useless. In practice, ...

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Is this approach (deriving a password from a signature) cryptographically sound? Not in general. There are signature algorithms that are completely deterministic and signature algorithms that aren't. With the latter kind you would be unable to reproduce the password later. With a deterministic algorithm, yes, the basic idea of using the signature as a ...

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Oh, I have found an answer. PEM here is PKCS#1 (RSA) key. Not sure why ssh-keygen used this terminology. And PKCS#8 could be used for Public keys as well since RFC-5958 which obsoletes RFC-5208. A very good article is https://tls.mbed.org/kb/cryptography/asn1-key-structures-in-der-and-pem and this question is also good: ...

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Enhancements: @Thomas' answer said …OTP is very weak to a known plaintext attack… I recommend that you still compress your message before sending. There are many options for that, each with varying benefits. related: http://blog.alivate.com.au/improve-security-with-compression/ It doesn't eliminate the plaintext attack risk but does reduce it, ...

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In ssh-keygen.c of the OpenSSH source code, there is the following call: if (prime_test(in, out, rounds == 0 ? 100 : rounds, generator_wanted, checkpoint, start_lineno, lines_to_process) != 0) ...and a comment for the function prime_test says: * perform a Miller-Rabin primality test Therefore, it does indeed use a ...

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I think you overlooked some words in section 9: Key re-exchange is performed using whatever encryption was in effect when the exchange was started. Encryption, compression, and MAC methods are not changed before a new SSH_MSG_NEWKEYS is sent after the key exchange (as in the initial key exchange). Note that it is better to keep to the ...

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