Aug 03, 2015 · The SSH protocol specification requires implementations to support at the least the following two DH key exchange methods: diffie-hellman-group1-sha1. diffie-hellman-group14-sha1. Both methods use an Oakley group; the first method uses the Oakley Group 2 of size 1024 bits and the second method uses the Oakley Group 14 of size 2048 bits.
The hash is used as a unique value of fixed size representing a large amount of data. Hashes of two sets of data should match if the corresponding data also matches. Small changes to the data result in large, unpredictable changes in the hash. The hash size for the SHA1 algorithm is 160 bits. It produces a 160-bit hash value from an arbitrary length string. HMACSHA1 accepts keys of any size, and produces a hash sequence that is 160 bits in length. Due to collision problems with SHA1, Microsoft recommends SHA256. SHA1 and other hash functions online generator sha-1 md5 md2 md4 sha256 sha384 sha512 ripemd128 ripemd160 ripemd256 ripemd320 whirlpool tiger128,3 tiger160,3 tiger192,3 tiger128,4 tiger160,4 tiger192,4 snefru gost adler32 crc32 crc32b haval128,3 haval160,3 haval192,3 haval224,3 haval256,3 haval128,4 haval160,4 haval192,4 haval224,4 haval256,4 NIST SP800-131 recommended transition algorithm key sizes of RSA >= 2048, DSA >=2048, NIST ECC recommended curves >= 224, and the disallowment of SHA-1 for digital signature generation are not enforced by System SSL. Brainpool ECC curves are not to be used in FIPS
When using an AES algorithm, the key size will determine whether AES-128, AES-192, or AES-256 is used (all are supported). When a DES algorithm is used, the key size will determine whether 3DES or regular DES is used. Use a 3DES algorithm to enforce Triple-DES. Examples
SHA-1 (160 bit) is a cryptographic hash function designed by the United States National Security Agency and published by the United States NIST as a U.S. Federal Information Processing Standard. SHA-1 produces a 160-bit (20-byte) hash value. A SHA-1 hash value is typically expressed as a hexadecimal number, 40 digits long.
The method of key exchange used for the name "diffie-hellman-group14-sha256" is the same as that for "diffie-hellman-group14-sha1" except that the SHA2-256 hash algorith is used. The group15, group16, group17, and group18 names are the same as those specified in as 3072-bit MODP Group 14, 4096-bit MODP Group 15, 6144-bit MODP Group 17, and 8192
It will pick the variant by the size of the key you pass in. If you use a passphrase, then it will generate a 256-bit key. DES, Triple DES. DES is a previously dominant algorithm for encryption, and was published as an official Federal Information Processing Standard (FIPS). DES is now considered to be insecure due to the small key size. SHA1 SHA1 (Secure Hash Algorithm) is a cryptographic hash function designed by the National Security Agency (NSA). SHA1 produces a 160-bit (20-byte) hash value, typically rendered as a hexadecimal number, 40 digits long. SHA1 is the most widely used of the existing SHA hash functions, and is employed in several widely used applications and Disable Diffie-Hellman-Group1-SHA1 on your server and only enable secure key exchange algorithms. If your server allows this, then this is the recommended option. For those using JSCAPE MFT Server , we recommend you upgrade to the latest version. Secret Key Select a message digest algorithm SHA1 SHA224 SHA256 SHA384 SHA512 MD2 MD4 MD5 RIPEMD128 RIPEMD160 DES DES/CFB8 DESEDE DESEDE/CFB8 DESEDE64 DESEDE64WITHISO7816-4PADDING GOST28147 IDEA IDEA/CFB8 ISO9797ALG3 ISO9797ALG3WITHISO7816-4PADDING PBEWITHHMACSHA PBEWITHHMACSHA1 PBEWITHHMACRIPEMD160 RC2 RC2/CFB8 RC5 RC5/CFB8 SKIPJACK SKIPJACK